The Amp Garage

I had the same problem. With my build it was the heater balance resistors not grounded at the same spot. It looks like that is the case with yours too: Screenshot 2026-04-11 084249.png Because you use 2 different sockets for the balance resistors, you might have used the same heater line twice. You...

I had the same problem. With my build it was the heater balance resistors not grounded at the same spot. It looks like that is the case with yours too: Screenshot 2026-04-11 084249.png Because you use 2 different sockets for the balance resistors, you might have used the same heater line twice. You ...

I used a coping saw for my first build. It took some time, some blades and it's not very accurate. But it did the job. Cheers
Gerhard

Garveyte01 wrote: ↑Sat Mar 01, 2025 3:35 am So I reworked my bias pot connection and I have about-35 dc volts on my control grid, but I’m still getting severe tremolo (fast oscillation) and from what I can read on my current limiter it is drawing 30 volts to ground

You might have to swap the OT primary connections.

Hello, I stumbled over a recent show from Carlos Santana on Youtube. No Boogie at front, but an ODR. Looks like #60 CarlosSantanaDumble.png ODR 0060 and ODS 0204.jpg Video: https://youtu.be/3Q1s4ahmxY0?si=XNpRvyuF0juxIARg Didn't know he owned that one. I know, he is using Dumble amps for a long time...

I've built a #124. Works great with both. Lots of clean headroom, even with high output humbuckers. Great thick overdrive, without getting muddy. And very versatile, too. It can make a Tele sing.

martin manning wrote: ↑Tue Sep 17, 2024 5:44 pm Why? As the filter circuit is understood here, the inductor has no audible effect.

I can approve, you filter design works perfect (after I cleaned up my mess). No need to add an expensive snake oil device

Which VOX? I think you are looking at the AC15/30 design. But then there are different iterations of these amps too, which are quit different. Most Dumble amps are based on Fender circuits, and there is nothing I know about, that has a EL84/6BQ5 cathod biased poweramp section, nor an EF86 preamp sta...

martin manning wrote: ↑Thu Mar 21, 2024 5:37 pm Very nice! Adding the FET boost was worth the trip, eh?

It's a nice feature, and prevents me from leaving an unused jack in the amp.

G.

Here is the final result: IMG_20240321_114524.jpg IMG_20240321_114550.jpg IMG_20240321_114600.jpg I finished the FET boost with relay switching: IMG_20240321_114600.jpg There was a diffrence between Martins drawings and what I have done with Erwins relay board, NO2 and COM2 needed to be switched aro...

I just finished my #002. I must say, if you leave the reverb out, you miss a big highlight of this amp. The reverb is one of the best I've ever heard in an amp.
But I'm a reverb hound and if you're not, leave it out.

Cheers
Gerhard

I buttoned it up for the first time.
Cheers
Gerhard

If you need schematics, layouts etc. for an SLO have a look here:
https://drive.google.com/drive/folders/ ... sp=sharing

Feel free to contact me, if you have further questions.
Cheers
Gerhard

https://www.reichelt.nl/nl/nl/jfet-s-c8417.html?r=1 Very suitable as audio input amp. Low noise, low bias, high transconductance In my own amp i used this one: https://www.reichelt.nl/nl/nl/transistor-2sk-30-2sk-30-p2181.html?r=1 yet I found some 2N4416A in my stash. I don't know the source, from w...

martin manning wrote: ↑Wed Mar 13, 2024 4:47 pm I guess what you were saying is that you have 12VAC available for a relay power supply.

Yes. But there is nothing that holds me back to put an additional regulator and electrolytic to step down from 12 to 9V for a booster. Or is there something I've missed?