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Update My Dynaco Store

Everything you need to update
your Stereo 120, SCA-80(Q), Stereo 80, PAT-4, PAT-5, FM-5, or AF-6, and now the GT-102 Power Amplifier Kit!

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Visit the Akitika Store if you'd like to buy the sub-modules from a GT-101 for your own special projects

Selling separate components from the GT-101 began when a customer wanted to build a seven channel amplifier. He bought 7 amplifier modules, 3 power supply regulators, and 3 power transformers. The light-bulb over my head went on...Maybe lots of other DIY'ers would like to build special amp configurations in their own custom enclosures. By offering the modules and parts, everyone wins.

Do you have a custom amplifier project in mind? This is the place. Have questions? Send email to

Visit the Akitika Store to see the GT-102 Power Amp or PR-101 Preamp!

PAT-5 Preamp Line Stage Kit (PAT5LS) $92

PAT-5 Preamp Line Stage Kit

If you have an old PAT-5, the capacitors are probably pretty well shot. You could replace them, and that would help, but with this kit you'd be doing better. Instead of electrolytic caps, all the caps in the signal path are film caps. That's as good as you can get. It's hard to get a lot of capacitance with film caps, so we've used lots of them in parallel to get the needed size while preserving the linearity.

But that's not all! (Sorry if this is starting to sound like a late night UHF TV commercial...It's just really cool!) The PCB design is double sided, with a ground plane. It's completely compatible with all the existing controls, pots, and push-buttons. It uses modern low-distortion, low noise opamps, better than anything available when the PAT-5 was born. This will take a PAT-5 from darn good, and bring it all the way to crazy-good.

The kit contains parts and PCB's for both channels, as well as the niceities you've come to expect...wire labels to make the installation go smoothly, keps nuts to make reassembly easier, and a manual that lays everything out in a clear, step-by-step fashion.

Right now, you are pre-ordering the kit. We're scheduled to ship before the end of May. Order your kit today...and be sure to look further down the page...We supply the kit with NE5532 Opamps, used everywhere in recording studios. Still, you can even take this further, and choose different opamps, and install sockets if you want to do experiments.

PAT-5 Preamp Line Stage Gold Plated Sockets $4 for 4 sockets (GPS4)

Some audio guys love to experiment, swapping opamps and listening to music far into the night. This kit provides 4 high quality, gold plated, 8 pin DIP sockets so you can indulge your desires, and swap till you drop. Warning: Although it's MUCH easier to swap socketed ICs than soldered IC's, it's still tough to do when the Line Stage PCB's are installed in a PAT-5. However, if you want to preserve that option in the realm of the possible, then get this kit. Later kits on this page offer popular alternative opamps to populate these sockets.

LME49720 Opamps $16 for 4 Dual Opamps (LME49720X4)

LME49720 opamps are very well regarded. Do they sound better than the NE5532's that come stock with the PAT5 Line Stage kit? Find out when you buy this kit. It contains 4 of the famous LME49720 dual-opamps in 8 pin DIP packages. Plug them into your PAT-5 Line Stage boards, and see which ones you like best. Will it be the stock NE5532's, these LM49720 opamps, or something else?

OPA2134 Opamps $24 for 4 Dual Opamps (OPA2134X4)

OP2134 opamps are also very well regarded. They have JFET inputs, rather than the bipolar transistors you'll find in the LME49720 opamps. Do they sound better than the NE5532's that come stock with the PAT5 Line Stage kit? Find out when you buy this kit. It contains 4 of the OPA2134 JFET input dual-opamps in 8 pin DIP packages. Plug them into your PAT-5 Line Stage boards, and see which ones you like best. Will it be the stock NE5532's, these OPA2134 opamps, or something else?

PAT-5 Preamp Tone Control Pots (PAT5TNPT)

PAT-5 Preamp Tone Control Pot works for either bass or treble control

The tone control pots for a PAT-5 seem to be made from pure unobtanium. It's a dual pot, with dual concentric shafts, and a special taper. They just don't make them anymore! But, I have commissioned a supplier, and worked closely with them to get all the details right. The result? These are drop-in replacements for PAT-5 tone control pots. The PAT-5 uses the same kind in both the bass and treble controls. We've set up special pricing for you, where you get a break when you buy two pots. Make your PAT-5 operate as smoothly as it did just after you built it with these beautiful new tone control pots.

This item is scheduled for delivery by the end of June. Quantities are limited, so order now!

Stereo 120 Level Indicator(ST120VU) $42

Stereo 120 level indicator

The Stereo 120 Level indicator kit has 8 LEDs for each channel, 6 green, 1 yellow, and 1 red. They cover a 42 dB signal range, giving useful indication for all but the softest listening levels. It is designed to fit into upgraded stereo 120 amp kits where the old chassis-mounted style speaker caps have been replaced. The finished unit has components on both sides of the PCB, and silk screens on both sides guide you as to where everything goes. It won't make your Stereo 120 sound any better, but it will sure look cool! Take a look at this youtube...see what you think:

PAT-4 Selector Switch Upgrade (PAT4SEL) $87

Selector switch upgrade PC boards

This selector upgrade kit replaces the original selector switch. It has a lot of advantages.

The new switch changes the operation from 3 low level inputs and 3 high level inputs to 1 low level input (phono) and 5 high level inputs.

This kit requires some other upgrades to have been previously installed

The following upgrade kits must have been previously installed

You'll have to either:

Two Single Channel Amplifier Module Kits (TCK2) - $98.00 gets you both channels! (Stereo 120 Power Amplifier)

Assembled Pair of amplifier modules.

A Pair of Assembled TCK2 channels. Please note: the TCK2 comes is a kit!

parts common to both channels

The kit comes with solder, thermal compound, and the lugs and wire you need to make your Stereo 120 better than new.

The kit that started everyone Updating their Dynacos is now better than ever. It now comes standard with the technology that makes the GT-101 so popular:

Here's the story...practically everyone who ordered the original TCK kit was upgrading it with the 10,000 uF capacitor option. So now, it's included in the TCK2 kit.

The kit includes circuit boards and parts, enough to build a left and a right channel amplifier module to replace the original amplifier modules in your Stereo 120. We supply everything you need, electronic components, PCBs, thermal compound,solder, new hardware, and new wire (you'll also recycle some wire from your old amp modules).

The Assembly Manual can be found here.

Two Assembled and Tested Single Channel Amplifier Modules (TCA2) - $148.00 gets you both channels!

two assembled kits

You get two assembled and tested TCK2 updated amplifier modules (with 10,000 uF output capacitors and 0.1% gain setting resistors. You still need to remove the old amplifier modules from your Stereo 120, mount, and wire in the updated modules. We give you all the components and hardware you need to complete the job.

This link lists the Assembly Manuals for the various possible final assembly options. Select one of these manuals to guide you through final assembly, e.g. wiring the assembled modules into your Stereo 120, depending upon whatever other options you may have ordered.

Stereo 120 Complete Rebuild Kit (ST120CRK) -$195.50

Stereo 120 Complete Rebuild Kit

This is a complete kit to update and upgrade a stereo 120. It replaces the amp modules and heatsinks, power supply regulator (old heatsink is re-used). Of course, you can pick and choose just the components you want as you look through the rest of the store. However, the complete rebuild kit includes these kits:

It has everything that you need to update and upgrade a Stereo 120. If you don't want everything on the list, it's still a nice guide to what you might select. For example, if you want to save $30, you can recycle the old heatsinks, and forgo the Super Duper Heatsinks. If you do this, you'll have to order the other items in the above list separately. It's easy, so either way, no worries.

There are a few things that aren't on the list that you might want to add

If you want these additional items, you'll have to add them to your order.

Two Super-Duper Heatsinks (SDHSX2) - $30.00 gets you super-duper heat sinks for both channels! (Stereo 120 Power Amplifier)

Comparing a stock heatsink to a Super-Duper Heatsink

The picture above compares a stock heatsink, on the left, with a super-duper heatsink on the right. The kit includes two super-duper heatsinks. The super-duper heat sink has a base-plate that's twice as thick as the stock heatsinks. In addition, it has fins that add another 1/4". The result lets you deliver more power longer, while keeping the amp cooler.

In addition, a set of super-duper heatsinks makes for a quicker, easier rebuild. When you use super-duper heatsinks, you just cut the wires and remove two screws in the base-plate to remove the old amplifier modules, but leave them intact. That saves disassembly time. The new amplifier modules fasten to the Super-duper Heatsinks and bolt right in to your Stereo 120. Note that owing to the precision hole locations, you'll want to use the super-duper heatsink as a fixture to set the height of the power amplifier IC when you build an amplifier module.

Vinyl/Rubber Feet (FFT) - $4.99 for a set of 4! (most Dynaco products)

a set of four new feet around two old feet

If your Dynaco is original, the Vinyl/rubber feet on the bottom are 40+ years old. In that time, they dry out and fall to pieces. These replacement feet fit pretty much all the Dynaco equipment. PAS-3, PAT-4, Stereo 120, SCA-80...everything you can think of. Replacing the feet is quite easy if your Dynaco feet are held on with screws. It's a lot more work if the feet are held on with rivets. The FFT replacements fit perfectly, except they're a bit taller than the original feet. The picture shows two original feet, surrounded by four of the taller feet. The increased height is typically a benefit, as it allows better air circulation, reducing operating temperature and enhancing component life.

Power Supply Replacement Capacitors (PSRC) - $15.00 - (for Stereo 120 Power Amplifier)

new capacitors and old

Electrolytic capacitors don't last forever. The silver capacitors in the background are the originals. The small one on the left was used for C9 (1000 uF at 100 V), and the large one on the right was used for C12 (3300 uF at 100 V).

The two black capacitors in the front are 3900 uF 100 Volt capacitors. They fit nicely into the existing clamps for C9 and C11. The new caps are meant to be used with an update kit. The upgraded amplifier modules don't need C11, so we replace the original C11 with 3900 uf, and then use it to supply the C12 function with upgraded amplifier modules. Of course, you can add a really big C12, as shown below, for even more energy storage.

If you want to replace all the big power supply capacitors and you have original amplifier modules then you'll need to also pick one of the C12 options shown below.

C9 Replacement Capacitor (C9RC) - $7.50 (For Stereo 120 Power Amplifier)

This is a 3900 uF 100 Volt capacitor that is used to replace C9. It fits into the original C9 clamp, and makes a nice bump up in energy storage and output power, particularly at low frequencies. This is a good choice if you're replacing the amplifier modules and have chosen to upgrade C12 to a total of 20,400 uF (see below).

If you're replacing both C9 and C12, and would rather trade some savings for performance, you could instead order the PSRC (see above).

Replace C12 for Better Bass (C12XX, see table) - $21.00 (for Stereo 120 Power Amplifier)

20,400 uF replaces 3300 uF for better bass

Components in the C12DD kit are pictured above

This table shows the upgrade kit to order, depending upon the modules in your Stereo 120. Each kit has just the right components to maximize the performance of that particular configuration.

Power Supply Amplifier Modules Upgrade Kit Order

The stock value of C12, 3300 uF, really isn't big enough to get the maximum amount of low frequency power out of your Stereo 120. These kits provide a Dynamite Capacitor Configuration of 3 6800 uF 80 Volt caps. You'll wire them in parallel to produce a mighty 20,400 uF. They also include the ancillary components needed to maintain long life and best performance. View the C12 Installation Manual. Read more background on the dynamite capacitor configuration.

Stereo 120 Replacement/Upgraded Power Supply Kit (PSUG)-$39.00

replacement power supply kit

Does your Dynaco Stereo 120 have power supply problems? Our kit may be just what you need. The original Dynaco Stereo 120's power supply was a classic, clever, Dynaco design. Unfortunately, its performance depends upon unpredictable parameters in the transistors. As such, it has a reputation of being a bit temperamental, and a bear to repair.

Our new design drops right in, replacing the PC-15 regulator board and Q9 pass transistor. It re-uses the existing capacitors, power transformer, and heat sink. It has slow start, predictable current limiting, short circuit protection, accurate output voltage, super low output impedance, and low noise. It's compatible with both the original Dynaco Amplifier Modules, and the Updatemydynaco replacement amplifier modules.

The kit contains everything you need to get your power supply into tip top shape...

The picture shows an assembled power supply, but will receive this as a kit. The kit is easy to build. It uses all through-hole components. The circuit board has been specially designed with generous spacing between all the soldered points, making assembly easy. P.S. - I'm sure that some buyers of this replacement power supply will do so in the search for superior sound, even if their existing power supply works fine.

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Assembled and Tested  Stereo 120 Replacement/Upgraded Power Supply Kit (PSUGA)-$79.00

This is an assembled and tested version of the PSUG kit shown above. You still have to install it into your Stereo 120, but buying in this form may be the right choice for some. We build and test each to order, so shipments happen about 1 week after your order is received.

Blue Light for PAT-4, Stereo 120, Stereo 80, or SCA-80 Power Switch (BLUE)-$7.95

blue light on a dark night

The original power switches have classic orange neon-lamps. Swap them for beautiful blue using our step by step directions... Blue Light Assembly and Installation Manual. Not so many steps in this case, so you should be able to complete a Stereo 120 lamp swap in about 1 hour. This mini-kit gives you eight tiny blue LEDs preassembled onto a PCB about the size of an NE-2 lamp. You install the included dropping resistors and heat shrink tubing to complete assembly, then swap out the orange NE-2 for beautiful blue. You can put blue light anywhere an NE-2 lamp can fit.

FM-5 and AF-6 Tuner Replacement Cartridge Lamps for Front Panel (FM5CLR)-$15.00

original cartridge lamp with end-caps removed, and a new LED-based lamp with recycled end-caps

An original cartridge lamp with the end caps removed. Make sure to save the end-caps. New LED-based lamp uses recycled end-caps

The original dial lamps for the FM-5 were completely custom. Their form is what is generally know as a "cartridge lamp". It looks like a 3AG fuse, but it's longer and thinner, and it's a light bulb, not a fuse. Of course, these original lamps are totally unavailable. This kit recycles the old end-caps. You'll combine your old end-caps with a brand new pre-built small surface mount PCB that has LEDs to replace the original lamps. The kit includes 2 assembled PCBs, enough to replace both cartridge lamps. The LEDs should last much longer than the original incandescent lamps. They'll restore your FM-5 or AF-6 front panel to its original luminous loveliness.

The surface mount PCB comes pre-built and tested. You'll add one thru hole capacitor (supplied) as you finish the assembly by transferring end-caps from your old cartridge lamp. This kit provides a set of two replacement lamps.

Limited quantities are now in stock!

Improve Bass with Upgraded Speaker Coupling Caps for Stock Stereo 120, ST-80, and SCA-80(Q) Amplifier Modules (C7X2)-$25.00

C7 Upgrade kit

The original speaker coupling caps were a bit on the small side, at 3300 uF. This kit provides 6 3300 uF capacitors that you arrange in a Dynaco Dynamite Capacitor triple. This yields 9900 uF per channel, producing better bass, more bass power, and lower bass distortion. As always, you get a step-by-step manual that guides you through the upgrade process. You recycle the capacitor clamps, some wire and some screws. We've included special hardware in the kit to make the most cumbersome part of the job go more smoothly. This kit works for both the ST-80, SCA-80, SCA-80Q, and the Stereo 120. Take a look at the C7 Upgrade Assembly Manual. It's about a 4 Meg download owing to some hi-res pictures that we think will make the upgrade enjoyable.

Order your C7X2 kit today for better, stronger, and cleaner bass from your Stereo 120,SCA-80, SCA-80Q, or ST-80 with stock (original) Dynaco amplifier modules.

Electronically Regulated Power Supply Kit for PAT-4 Preamp (PAT4PWR) - $39.00

PAT-4 Power Supply

The original PAT-4 power supply was another classic Dynaco compromise, perfectly appropriate for the time. Later, people took the "add a mess o'microfarads approach" to improve it. This new PAT4 replacement power supply beats all those approaches hands down. It is electronically regulated with super quiet 38 Volt and 17.5 Volt rails. The output voltages remain rock steady even as the line voltage wavers and the music plays. I think you'll hear a nice improvement in the sound of the PAT-4 using this power supply.

The picture shows the FR-4 (green) PC board, and the way the replacement power supply elegantly mounts in place of the old capacitor can. The new arrangement dramatically decreases the loop-area of the rectifier input, cutting stray hum fields. The kit comes with everything that you need...PC board, parts, mounting brackets and screws (but no solder).

Here's the Assembly Manual for the PAT-4 Power Supply (Rev A, no longer shipping)

Here's the Assembly Manual for the PAT-4 Power Supply (Rev B, shipping since November 10, 2013).

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Assembled and Tested   Electronically Regulated Power Supply Kit for PAT-4 Preamp (PAT4PWRA) - $79.00

This is an assembled and tested version of the PSUG kit shown above. You still have to install it into your PAT-4, but buying in this form may be the right choice for some. We build and test each to order, so shipments happen about 1 week after your order is received.

Tone Control Switch for PAT-4 Preamp (TCS)-$10.00

switch wire locations

Tone controls can be handy, but sometimes it's great to know what things sound like when they're absolutely out of the circuit. This kit replaces the seldom-used HI FILTER switch with a two position switch. The OFF position turns OFF the tone controls, no matter how they are set, giving flat response. The "15" position restores normal tone control operation. You can easily switch between the two positions. Our careful design makes the switch-over completely free of clicks and pops. So now you can have it both a purist with absolutely flat response, or use the tone controls when your source material needs a hand.

The kit now includes replacements for the two capacitors most likely to have gone leaky. You'll want to install these caps if your bass control is scratchy. That often will take care of the problem, at least in all those cases where bass control is still in reasonable shape.

Tone Control Switch Assembly Manual

Reduce PAT-4 Distortion by 10X (DRD4)-$5.00

darlington reduces distortion

All the sound in the PAT-4 passes through the high level stage. This kit reduces the distortion in the high level stage by a factor of 10X. You'll replace Q4 in both channels by a specially selected Darlington transistor with a heat sink. Everything that goes through your PAT-4 will be cleaner. The kit includes two new transistors, one for each channel. Distortion Reducer Installation Manual.

This $5 kit has been called "the best value in audio". Hear the difference it will make in your PAT-4 Preamp!

PAT-4 Phono Preamp Upgrade Kit (PAT4LP)-$24.00

Phono Preamp Upgrade installed into a PAT-4 Preamp PCB

This kit turns the PAT-4 Phono Preamp into a seriously good piece of gear. It drops the noise by 4 to 8 dB. It makes topology and parts changes that let you get rid of the big electrolytic caps, dramatically improving the sound. It's can select optimal gain when you install the upgrade. It lets the PAT-4 handle three phonos. It removes the clunks that always accompanied the switch from high level to low level sources. This is a challenging kit, but you'll love the results. The picture shows the PAT-4 PCB board after the mods of the PAT4LP kit.

Please note-this kit has one reduces the rushing component of the PAT-4's noise so much that it unmasks the unavoidable hum floor of the PAT-4 phono preamp. That hum floor is not noticeable when playing a record, but depending on your system, you may notice it with the needle up.

PAT-4 Phono Preamp Replacement Kit (PAT4PPR) - $42.00

assembled phono preamp for PAT-4

This kit costs more than the PAT4LP listed above, but then you get more. This is a complete, new PCB and components kit that replaces the phono section of the original PCBs. There are a lot of nice advantages to doing it this way:

Please note: This kit requires that you have installed the PAT4PWR improved power supply!

Convert PAT4PPR For Use in a PAT-5 Preamp (P4PPR2P5A) - $5.00

You can replace the phono preamp in your PAT-5 when you combine the PAT4PPR with this kit. The combination adds a great sounding, quiet, accurate preamp to your PAT-5. Unlike the other Updatemydynaco kits, it doesn't have all the mechanical bits worked out in its current form. I haven't yet written a detailed installation manual for this combination. Still, that hasn't stopped a number of people from adding these kits to their PAT-5, with great results.

PAT-4 Line Stage Replacement Components (P4LSRC)-$30.00

One PAT-4 PCB modified with Line Stage Replacement Components

The picture above shows one PAT-4 PCB modified with Line Stage Replacement Components, and the DRD4 kit (not included)

This kit supplies replacement resistors, electrolytic capacitors, and input transistors (Q3) for the PAT-4 preamp line stage. The kit consists of enough components to do both the left and right channels. The original resistors had 5% and 10% tolerance. The resistors in the kit have 1% tolerance. The original resistors were carbon composition. The new resistors are metal film. Metal film resistors are both quieter and have less distortion.

To minimize your overall work while maximizing your overall performance, you might want to also purchase and install these kits at the same time:

Note that the kit doesn't replace the polyester capacitors as these have an almost indefinite life.

Replacement RCA Jacks for PAT4 Preamp with Great Ground (PAT4RCAGG)-$21.00

PAT4 RCA Jack Kit installed into a PAT-4 Preamp

Gold plated RCA jacks make quality connections.

The RCA jacks on a PAT-4 can get pretty oxidized and just plain crummy with time. That makes it hard to get a good low resistance connection, which can lead to lots of extra noise and distortion. You can replace all your RCA input and output jacks with this kit, get great connections, and great sound.

We've also added the "Great Ground" to the kit. The original ground was just a self-tapping sheet metal screw. Of course, you never have a screw driver handy when you're fiddling around with the connections. The great ground supplies a 6-32 thumb-screw arrangement so you can connect your grounds without any tools. (You will need to open up the ground hole a bit).

At just $21 plus shipping, the price is practically a give-away!

Note: It's easy to change the jacks if yours are held in by screws. If they're held in by rivets, think carefully before purchasing this kit. The rivets can be drilled out, but it's a lot more work!

Replacement RCA Jacks for PAT5 Preamp(PAT5RCAJ)-$21.00

PAT5 RCA Jack Kit installed into a PAT-5 Preamp

PAT-5 with the new jack kit.

This kit is for the PAT-5. Its RCA jacks can get pretty oxidized and just plain crummy with time. The picture below shows an SCA-80 with original, oxidized jacks. That oxide makes it hard to get a good low resistance connection, which can lead to lots of extra noise and distortion. You can replace all your RCA input and output jacks with this kit, get great connections, and great sound. Check out the pictures above or below to see the beautiful gold plated RCA jacks that are part of this kit.

At just $21 plus shipping, the price is practically a give-away!

Note: It's easy to change the jacks if yours are held in by screws. If they're held in by rivets, think carefully before purchasing this kit. The rivets can be drilled out, but it's a lot more work!

Replacement RCA Jacks for SCA80(Q) Integrated Amp(SCA80RCAJ)-$12.00

SCA80 Jack kit half installed to show the difference

Gold plated RCA jacks make quality connections.

This kit is for the SCA-80 or SCA80(Q). The picture above shows a half converted unit. The jacks on the top are new gold-plated RCA's. The jacks on the bottom are the original, oxidized RCA jacks. That oxidation makes it hard to get a good low resistance connection, which can lead to lots of extra noise and distortion. You can replace all your RCA input and output jacks with this kit, get great connections, and great sound.

At just $12 plus shipping, the price is practically a give-away!

Note: It's easy to change the jacks if yours are held in by screws. If they're held in by rivets, think carefully before purchasing this kit. The rivets can be drilled out, but it's a lot more work!

Replacement Power Transformer for PAT4 Preamp Decimates Hum (PAT4X)-$49.95

Prototype of PAT4X kit. Toroidal Transformer Cuts Hum.

Toroidal Transformer replaces original E-I transformer and cuts hum!

If you already have the PAT4PWR installed, this kit is the next (and perhaps final) big step in making hum as low as it can go. More information on the PAT4X kit. This is a special order item, but we have kits in stock now for immediate delivery. .

RCA Input Jack Set for Stereo 120 and Stereo 80 (RCAJ)-$4.00

rca input jack replacement

Do your input jacks look oxidized? The ground connection on the Stereo 120 input jacks gets kind of grungy after 40 years. The signal connection probably looks worse, but it's a bit hard to see. All that gunk can cause hum and noise. The RCAJ kit provides new, clean, RCA input jacks for the Stereo 120 or the Stereo 80. They drop right into the existing mountings. You can re-use the original hardware if you like, but we supply new Phillips head screws and keps nuts. Keps nuts have permanently attached lock-washers. This makes reassembly much easier as the lockwasher can't fall off while you reassemble the jacks.

ST-80, SCA80 and/or SCA80-Q Replacement Cap for C9 (SCA80C9)-$14.00

sca80 C9 replacement caps

The SCA-80 and ST-80 have the same power amplifier section design. Not surprisingly, C9 is the main filter cap in both the SCA80(Q) and ST-80 power supplies. If your SCA80 or ST-80 is humming more than it used to, then it's very likely that the original C9 has lost a lot of its capacitance. This seems to be a very common problem with SCA80's, and a little less so with ST-80's. The SCA80C9 kit replaces the original 5000 uF 80 Volt capacitor with three 3300 uF 80 Volt caps in a dynamite capacitor configuration. It bumps the power supply capacitance up from 5000 uF to 9900 uF. You'll get lower noise and better bass.

SCA80 and/or SCA80-Q Replacement Cap for C11 (SCA80C11)-$29.00

sca80 C11 replacement caps

C11 was the silver-can 3-section filter capacitor that supplied power to:

If you've replaced C9 and still have hum it's a very sure bet that your C11 is on its last legs. These kinds of caps aren't available anymore, so we're going to go one better. The original kit used 3 caps and two resistors to make the 24 and 17.5 volt supplies. Simple, yes, but we can do a lot better with an update.

The SCA80C11 kit supplies the bulk capacitance required by the amplifier driver sections. To that it adds the finesse and control of two electronic regulators. One makes the 24 volts for the high level preamp stages and the other further filters that already clean power to make 17.5 volts for the phono preamp. The electronic regulation decreases noise, crosstalk, and output impedance of the power supplies. It also steadies the supply voltages no matter what's happening to the line voltage or the load on the power amps. The SCA80C11 kit's circuit board drops right in, replacing the original C11 with something that will truly upgrade your SCA80's sound.

Replacement Parts for SCA80(Q) Preamp Circuit Boards (SCA80PREDO)-$39.00

This kit replaces all the components on the preamp PCBs in an SCA80(Q).

The SCA80(Q) preamp boards were built with 10% carbon comp resistors. They drift in value and get noisy, hurting your SCA80's performance. You can restore it to better than new condition with this complete kit of parts. Quiet 1% metal-film resistors replace the original noisy drifty resistors. All the electrolytic capacitors are replaced. All the film caps are replaced with new film or COG capacitors. The old transistors are all replaced with some beautiful MPSA18 transistors. These transistors have lots of gain and low noise and are no longer available, except here in this kit. Your SCA80 isn't really re-built until the preamp section is re-built. We recommend having serious desoldering equipment before you undertake this kit.

Brand New Circuit Boards and Parts for the SCA80 Preamp PCB's (SCA80PRENEW)-$72.00

This kit replaces the PCBs and all the parts on the preamp PCBs in an SCA80(Q).

This kit is easy to build. It gives you everything you need to replace both left and right channel preamp PCB's in an SCA80(Q). It's much easier than the SCA80PREDO kit, since you get brand new PCB's to populate. And these new PCB's are nice! They have ground planes to reduce noise susceptibility. The have local bypass capacitors for improved stability and noise rejection (the original Dynaco PCB's had no local bypass caps).

That's not all...It has a darlington plus boot-strap topology that makes the equalization more accurate in the phono, and reduces distortion in the line stage and the phono. At typical operating levels, the preamp distortion is more than 100 dB down. That's better than 10 ppm, or 0.001%. It has 1% resistors and 1% capacitors in the phono eq. The phono equalization curves are very accurate, typically better than +/-0.25 dB. These boards are quiet and clean, and will make the preamp section of your SCA80(Q) better than new.

Each kit contains 2 PCB's and all the components you need to replace both left and right channel PCB's for the preamp section. We even throw in a set of wire labels and keps nuts to make reassembly easy.

SCA80(Q) owners, this is the project you've been waiting for!

Stereo 80 Capacitor Kit (ST80CAPS)-$45.00

Stereo 80. This kit replaces the big caps in the Stereo 80.

The most usual failure mode in the stereo 80 is that the big can capacitors lose capacitance. This kit bundles the following items:

SCA80/Stereo 80 Power Supply and Power Amplifier Upgrade Kit (PWRAMP80)-$142.00

PWRAMP80 kit replaces the power supply in a SCA80Q or Stereo 80

You can upgrade the power supply and power amp PCB's of your SCA80(Q) integrated amp or Stereo 80 Power Amp with this kit. It supplies:

The kit features low distortion and clean sound, much cleaner than the original SCA80/Stereo 80 power amp section. It also has timing circuits and speaker relays for completely civilized turn-on and turn-off. You'll enjoy building this kit, and you'll enjoy listening to the results for a long time.

Note: This kit re-uses the existing C9, C11, and C7. You can buy upgrade kits for C9, C11, and C7 separately. It does not include the SCA-80 or Stereo 80.

Pair of Blue LEDs for Amplifier Modules (BLUE2) - $1.00

Blue LED replaces R9 in a GT-101

Everyone loves the look of blue light from their stereo equipment. You can add it to your Stereo 120 (TCK) or GT-101 (AMP101) amplifier module with this least expensive kit of all. It's just two blue LEDs. Make sure to read these instructions so you can put the LEDs in with the correct polarity the first time!

You remove R9 on each amplifier board, and replace it with this LED. The cathode of the diode goes near the big output cap (C11). We sell them in pairs so you can do both left and right modules at the same time.

Picture shows a GT-101 amp module (not included) with one of the two Blue LEDs supplied installed in place of R9

Stereo 400, 410 and 416 Replacement Speaker Relay Kit (RY301)-$24.00

Replacement speaker Relay kit for Stereo 400

You can now get a replacement speaker relay kit for the Stereo 400, 410, or 416. It uses a pair of sealed relays with contacts rated at 16 Amps. This exceeds the original relay's current carrying capacity. We've named this the RY301 kit after its designation in Stereo 400 schematics. Here's the Stereo 400 Relay Kit Manual.

Stereo 80 Binding Posts (ST80BP)-$10.00

Stereo 80 Binding Posts outside view Stereo 80 Binding Posts inside view

Works on Stereo 80 power amp and SCA80(Q) Integrated Amp

The Stereo 80 has screw terminals for speaker connections. They're a bit hard to deal with. Here's a neat kit with two pairs of 5-way binding posts and lugs. They fit beautifully, although there is a gap in the center...but that gap gives you room to tighten both black binding posts. No manual available on this one yet...I figure it should be pretty apparent from the pictures above. Just $10.00 gets you easy on/off speaker connections on your Stereo 80.

The cut-out in the Stereo 80 is 0.5"x2.75". The slot in the SCA80(Q) is exactly the same size. Therefore, you can also use the ST80BP kit in the SCA80(Q), and it will look very much like the picture shown above. Note: Since the SCA80(Q) has two sets of speaker outputs, you'll have to order two ST80BP kits to replace the speaker connectors in an SCA80(Q).

Improved Power Supply Kit for the PAT-5 Preamplifier (PAT5PWR) - $50.00

For a few years now, some of you have been asking for improvement kits for the PAT-5 Preamp. A good power supply is critical to good sound, and the original PAT-5 power supply could be greatly improved. This new power supply has 100 times better regulation and 100 times less noise. You can find more information on the PAT5 Pages.

Set of 5 Chassis Screws (5CS) - $1.00

It seems like everyone has a Dynaco that's missing a screw! Here's a set of 5 screws, enough to replace all the original sheet metal screws that hold the cover on a typical Dynaco. The picture compares an original screw which the new screw. Note that the new screws have a brighter finish than the typical stock screws.

22,000uF 80 Volt Capacitor for Stereo 400 and Stereo 150 power supplies (22KUF80V) - $16.00 each

The original power supply capacitors in the Stereo 400, 410, and 416 were 10,000 uF at 80 Volts. You can double the energy storage and improve the low frequency output power when you change to these 22,000 uF 80 Volt capacitors. Their 2" diameter makes them drop right in. The screws have the right diameter and spacing, too. They'll also drop right in to a Stereo 150. These amps all use two capacitors, one for each polarity of power supply. These caps will drop into and upgrade a lot of big amplifiers...DH200's, DH220's...the list goes on and on! Here's a copy of the data-sheet.

Please note, that even though these capacitors have 2.2 times as much capacitance and a higher voltage rating than the originals, they are not as tall as the originals. Why? In the 40 years or so since the original caps were made, the electrolytic capacitor technology has advanced to where much more capacitance fits in much less space than it used to. I have found that shorter isn't a just typically fits into the amps with more headroom.

A comment about "2000 hours" on the capacitors. That refers to the life of the cap when operating at 85C, the rated ripple current, and supply voltage. In amplifier service, the ambient temperature is typically closer to 25C, and there is very much less ripple current than 8.5 Amps! As a result, it's reasonable to estimate that the core temperature (which depends on both ambient and ripple current) will be at least 60 C cooler. That says that the estimated life is then 2^(60/10)=64 times longer, or something more than 14.6 years of continuous duty use. If you turn your amp off, it's hard to say how much longer these caps would last...perhaps another 40+ years?

We Ship to the United States and International Destinations

United States Shipping

In the lower 48 states, we typically use USPS priority mail or first class mail for small packages. Larger packages, like the GT-101, are shipped using UPS ground.

International Shipping

Small packages, under 4 pounds in total weight, ship by First Class International Mail. Larger packages go by Priority Mail International, which takes 6-10 business days. Extra charges are typically involved in international shipments. Our international customers are responsible for paying any applicable duties on their shipments. Here's a link that you can use to estimate the additional country specific charges that you might have to pay.

Attention International Customers!

The Customs Forms require your phone number! Please send your phone number in an email to along with your order. We will contact you and work out the additional charges that may be required for international shipping.

International Shipping Deltas

International Shipping Delta

There are so many options for international shipping that we handle it on a case by case basis. If you're an international customer, we'll calculate if there is a required delta in shipping cost above domestic (United States) rates. You can pay that delta by selecting the correct value from the above International Shipping Delta pull-down menu, then click the the "add-to-cart" button. If you prefer, we can also invoice you separately for the delta in cost for international shipping.

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