The Amp Garage

Been moving slowly but got to get together the preamp board PXL_20250518_204042140.RAW-01.COVER.jpg And finishing the heaters as the donor would not leave me many options PXL_20250518_204008470.RAW-01.COVER.jpg Ran out of eyelets for the power amp board, order is on the way PXL_20250518_204125035.RA...

I would add that using a D-Lator on my dstyle builds adds volume significantly. And when that input gain is maxed, I get distortion, which is normal. Try and clip an alligator cable bypassing the resistor/ capacitor, and play. Listen to what the network does. IF I remember correctly, the network wou...

So I see in the schematic you are using a DC to DC high Voltage converter outputing around 300VDC. I am really curious to understand if there is any effects on the B+ vs a beafier toroid transformer that would get the secondaries up to 300VDC. Have you messed around with these DC to DC HV units befo...

Hey dmoose5835, Your layout references a Hammond PT 1182L6. How will you get the B+ voltages inline with what is expected dor a D-style amp (200 to 235ish VDC on the plates)? FYI I have built a badger rack preamp that works fine with a Antek AS-05T200. Where do you get uour PCB printed? Thanks; Fred.

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.