The Amp Garage

Hi there,

With the Jazz setting you need (!) to turn up the mids and bass to get back the volume/level. That is simply how this works. I think all is fine with your rock/jazz wiring.

Best, Electron

Not sure what this compares to Guy. It’s an incredible amp. In the clip above I adjusted it to John Mayer settings (seen pics of the amp on stage). Apart from making the PCB’s with those small vias and turrets, this was actually a very easy build. The grounding scheme of the reverb was surprising a...

Hi dmoose,

Thank you for this effort. Would it be possible for you to have the schematic and pcb layout exported as a pdf file to have a look at that?

I think that would make it easier to give fast feedback!

Best and thank you,

Electron

Found this gutshot that seems to show a tube on the left 12A_7 (PI? or preamp?) SYN2-Midi-fix_start_sm.jpeg And a thread that talks about the modules and found this schematic : SYN module Structure.jpg So they get 320V B+ DC from the power module (midi or amp I suppose). I like the old fashion eyel...

Good catch! Main objective was to lower the gain a bit. Why? The power amp has much more gain than the LTP+CF combination. The windows started to rattle with the master on 1. The amp did lose its wilder side though. Local feedback made it even cleaner, which was not what I was looking for. It did b...

And the schematic minus all relais. I think this amp would benefit from a deep switch instead of a mid boost, though that is subjective. No full layout. It's 90% SSS005 though. Hi Rootz, Nice amp and thanks for the schematic. I noticed you implemented a LNFB on V1b in this amp which AFAIK was absen...

Nice!

What is this? Intrigued.

Best,

Electron

Hi Charlie, Now I am a bit confused. Is it a 10M or 1M? Best, Electron Well, six years later and I think a made a mistake with regards to one of the component values in the Tweedle Dee. :oops: After talking to Jelle a while ago and staring at my own photos I now believe that the grid leak resistor o...

Many thanks for your reply Charlie!

Indeed Ampeg amps might have been a huge inspiration for Dumble. I found this Ampeg V9 schematic and this is quite interesting.

https://el34world.com/charts/Schematics ... peg_v9.pdf

Thank you,

Electron

Dear Ampgaragists, As you all know, Dumble ODS #121 is a rare specimen. Read up on the history of #121 and you will see that it was built for Todd Sharp and that it is covered in the Dumble book. Little to no information is available, but from the little information I derived a draft for a schematic...

What components you planning on? Mostly piher resistors, a combination of el menco and Mallory brown drops and Sprague di-film caps. Some old mepco rn60e for v1 and v2 plates and old Dale 50k for v3 plates with a 5k trimmer. Cathode caps a mix of old bc Philips and new Sprague TE, cathode resistors...

And is the only possible source of this voltage whatever the user puts into the input? Yes - including scuffling across a carpet and then touching the end of the guitar cable to plug it in. Several kV is pretty common for things like that. Then there's the static electrical gradient, about 120V/met...

Really neat work! I love your rig. Once you go rack, you can never go back! First pic is with the 200w per side Class D stereo power amp, but I couldn't resist an all tube 20/20 rig in the end! The Palmer Macht does have some slam though, and I'm keeping it. Wow, that looks nice rogb! Did you tweak...

ijedouglas wrote: ↑Thu Feb 15, 2024 7:02 pm Amazing work. I just love the look of those rackmount units. Great workmanship!

Thank you for your kind words Ian!

Electron

Schematic