The Amp Garage

Tube amp doctor sells CTS pots with true vintage audio taper. I used them in one of my amps and they work very well

If you like the 1k resistors there is no problem, but the originals are definitely 100 ohm. On the gutshot of the SSS001 you can see them very clearly. In my opinion either you're fixing a problem by doing a modification or there was no problem to begin with. Using a higher gain 12ax7 as first tube,...

Thanks all for the nice compliment

There is a difference in attenuation. For the filters i use the exact circuit of the original (drawn in Japan) schematic. For the input of the filter switches, the .01 and .001 caps in my amp are in parallel like the schematic. Some people think the amp sounds better when they are in series, but to ...

I think the filters should be wired more like the other SSS circuits where the high filter is basically made by putting different caps over a 820k series resistors. Gradually increasing treble and mid frequencies. With a larger cap selected on the high filter, the amp can lightly break up. A mid boo...

I looked at the MHartman schematic you say was used to build your amp. This schematic represents someone's idea of the SSS001. I don't know how this schematic was drawn up, but it looks like some parts of the schematic where filled in by somebody's best guessing. Using this schematic it would be ver...

It's tight in that area. Could I accomplish this by instead soldering the 2 resistors directly to these heater lugs and the center ground in this photo? IMG_5504.jpg Yes, but first remove the resistors you already put in. Even better would be a 200 or 250 ohm pot, center to ground and both outer lu...

Your schematic will most definitely not work for several reasons, but the most important one is that there is no signal on the anode of the first triode since it is directly connected to the B+. The easy way of adding reverb to a dumblelator would be to use a solid state reverb module from accutroni...

Although i guess no one knows how the trimpot was modified from 500k to 345,5k i wanted to try and replicate it. My thought was that there is a 1M resistor across the trimpot and since these pots have quite some tolerance a 528k pot and 1M resistor would make 345,5k. I first tried it with a normal r...

Wow, these PCB's look amazing!

You might want to swap the cathode caps on V2 and V3, and change the 22nF cap to the master for a 10nF cap.

Ok! But Even the drivertube must pull the electrons through the 220 kohm resistance, just like in the typical fixed bias setup. So how come it makes the bias voltage on output tube more stable? But although the output impedance is very low, ofcourse there is a limit to the maximum current the drive...

Ok! But Even the drivertube must pull the electrons through the 220 kohm resistance, just like in the typical fixed bias setup. So how come it makes the bias voltage on output tube more stable? The difference is that the traditional bias supply has a high impedance connecting a fixed bias voltage t...

I read you are using a ECC81 / 12at7 tube for the driver. This should be an ECC83 tube. This circuit is not designed for a ECC81. The isolation from filament to cathode is less than that of an ECC83. (90 vs 200 volt) I would recommend changing the cathode resistors back to 220k and making the resist...

I fitted all the tubes in, with ecc81 in v7. On Standby the volt on pin 5 on power tubes reads ca 80 volt. When I shift standby switch to “on” the voltage drops to 45 volts aprox, depending on the pot meter. So everything seems right when all tubes are active. I just dont understand the circuit!! I...

I used two vactrols in my C' lator to create a volume boost for soloing that can be switched with a footpedal. In this situation it works really well and the switching is silent. In my amps i have used relays but there is no reason why it should not work using vactrols. The Mesa MK3 uses kind of the...