The Amp Garage

Hey Dmoose5835, Very interested with your PCBs. I am switching over to rack preamp builds. Amp are taking too much space, and Dumble power amp sections re very redundant; Where do you get your PCBs printed? Do you have a reference for the connectors on mouser? Never used any of these and dont know h...

Here are a few pics of the donor Symphonic amp. Originally a stereo tube amplifier with single ended 6V6s, tube rectifier, two 12AX7 and a third smaller tube for tremolo. Probably 2 x 5 watts output judging the size of the small OT. 3 inputs and a pair of RCA jacks as speakers outputs. PXL_20240819_...

Hey guys, Another Tweedle Dee build is on the way! I want to assemble : - a single bright channel - with cathode bypass and NFB as provided on Rob Robinette's website (I love this feature that really extends the palette of the 5E3); - Dumble PI cathodine (with Lar Mar type II Master Volume and 470k ...

So any update to provide on your build? Having built an Ultraphonix with two different channels, the second being a variation of a JCM800, I am curious to hear yours with the cascading gain. There is already a lot of gain on my build's second channel, and probably way too much for the kind of music ...

Wow you really get down to the tiny details details! Beautiful build with all these NOS components hurt my eyes! Your faceplate look a bit "grainy", just like the original did, how did you manage that?

Fred.

PAB is a tonestack lift, so it bypass the EQ

Fred.

statorvane wrote: ↑Mon Feb 10, 2025 9:31 am Stereo amp (2 x 6BQ5) with center channel woofer / subwoofer (2 x 6BQ5)?

Hey Statorvane,

That is what I thought, but wouldn't that send too much signal on these two tube that receives the stereo input gain stages ?

Thanks for your opinion;

F.

It's an amp that can run two channel stereo, or one-channel mono at twice the power of a single channel in stereo. The middle 12A...7 is wire about the same as the other two, a gain stage and a concertina phase inverter. But its output is sent to a pair of tubes on each phase, rather than just one,...

I am pretty sure a soud like this would cut through a mix!
No need for a big sound in a band, but the right frequencies to get through
Clean to mean is really great .

Fred.

Finally founds some time to draw the layout, next is schematic if anyone what this power amp is or where it is coming from, let me know! Thanks for your help;

F.

Hard to see on the pictures, but I assume you put an insulation board under the board holding the components?

I would start with testing every point where HV goes in the board for a short.

Fred.

Yup, talk about a sexy faceplate! I have to have my ultraphonix high gain built a faceplate. I must say it took me a while to fall in love with it, happened recently. It feels to me this beast is a lot more sensitive to speaker choice. Settled on a G12 65 and a G12 65 creamback Love the mid bump and...

Hey Guy,

Thanks for listening to the clip.
Signal path is as follow : squier Flame guitar equiped with S&D JB and 59 pickups > badger preamp > the FX loops return of my 50W Dumble EL34 amp > ET90 by WGS
IIRC I read the same thing about the Power scaling solution.

Happy Holidays;

Fred.

hey Nworbetan, Thanks for your comment! I had initially planned to move the power supply board on the transormer side, but thought that the EMF could impact the power board, so I decided to put everything on the same side. It is far from perfect and again cable runs need some improvements. Planning ...

Hey Miles,

Glad you liked it!

Fred.