The Amp Garage

Nice!! This was a fun build to follow! I also like ECC803 long plates for V1 in most of my amps. I put them in my phase inverters when compatible too. I'm not sure if it's my ears or my eyes that think the tone is "bigger" with the long plates

Niicceeeeeee man! This is incredible!

Ryan, Do you just have the 2 star grounds now on either end of the power board? Is the ground plane on your 1/4 jack pcb split or is it all connected together? Also wanted to confirm you scraped the chassis to bare aluminum under your grounding points. I looked back at your build and Charlie Wilson...

Thanks, Guy! The build doesn't look so pretty at the moment lol trying to figure out the source of the hum. I used a pair of UF5408 to drop the voltage down a little with the heaters. They have a vF of 1.7v and I had a few laying around. I just tried your trick DC elevating the heaters using 1M/100...

Thanks, Guy! The build doesn't look so pretty at the moment lol trying to figure out the source of the hum. I used a pair of UF5408 to drop the voltage down a little with the heaters. They have a vF of 1.7v and I had a few laying around. I just tried your trick DC elevating the heaters using 1M/100k...

Ok, good news! I figured out where most of the hum/ground loop issues were. I also ended up grounding the input & output of the "B" loop if no jack was plugged in. This reduced one source of hum. I grounded the front pots but that didn't make much of a difference in my build. Another source of hum/n...

It's alive! ~368VDC B+1 & B+3, ~251VDC B+2. I changed the 15k dropper to 1.5k and that seemed to raise the voltage appropriately with this power transformer. Sounds great! Now it's the usual figuring out if humming is introduced via ground loops or lead dress. Oddly, the bright switches can make th...

It's alive! ~368VDC B+1 & B+3, ~251VDC B+2. I changed the 15k dropper to 1.5k and that seemed to raise the voltage appropriately with this power transformer. Sounds great! Now it's the usual figuring out if humming is introduced via ground loops or lead dress. Oddly, the bright switches can make the...

Ah! Thanks so much for pointing this out... A few growing pains/life lessons here, for me. New, new PCB designed and sent to the printer. Meanwhile, I'll hack up the proto board and reply with the results.

clipped the leads on the primaries from the PCB and wired up directly for 120vac mains. So far no popped fuse however I'm not getting voltage on the secondaries I'll try to figure it out tomorrow morning. Time for bed

sluckey wrote: ↑Wed May 17, 2023 8:25 pm Have you seen this...

https://www.hammfg.com/files/parts/pdf/229B120.pdf

Yes. I see where my mistake was made. I got lost while trying to be clever. I'm directly wiring primaries tonight/tomorrow morning per the PDF. If this is the only mistake, I'll be really happy!

martin manning wrote: ↑Wed May 17, 2023 7:08 pm Maybe you can cut some traces and add some wires to get it working?

Yup! That's my thought while new PCBs are being fabricated. Thanks for pointing this out!

martin manning wrote: ↑Wed May 17, 2023 6:14 pm Are you sure you have the phases of the dual primaries right?

I'm not sure but I'm Googling right now....

Edit.. I think you're right, Martin. Ugh.. I'll get a new PCB made

Hey all! I know some of you have been following along in Charlie's Dumbleator II thread and I was working on a PCB since one was not openly available (to my knowledge). I'm using Hammond 229B transformers so the end-user can choose between 120vac or 240vac mains simply by utilizing the jumpers. Ever...

Welcome to THIS forum, Matt! Super cool project and I admire your deep DIY effort on this! Impressive!

Did you punch your own chassis too? Looks great!

-Ryan