The Amp Garage

FET board isn't connected... amp B+ legs are and bias... being super careful with flying leads off the amp board....

Yes, that was 20VAC at IEC inlet—w/ bulb limiter.

Here's 120VAC, still with limiter:
B+, B+2: 412.3VDC
B+3: 408.5VDC
B+4: 389.7VDC
B+5: 388.7VDC

Bias: -45VDC

Relays: 12VDC
Pin 1 on reg: 14.67VDC

And a nice red LED.

Bias 1 shows about -9VDC.
Pin 1 on the regulator is 2.1VDC, but the AC is only about 1.2VAC from the 12V trafo with 20VAC on the vairac and bulb limiter...relay supply is similarly low...not hooked up yet. Should I take everything to full voltage?

Just got notice the OT is in the mail! Will I finish the Dumble first?

Fired up the PSU....NO drama!!!

Here's the voltages @20VAC on the variac—with limiter—it was about 20VAC on the IEC //
B+, B+2 79.7VDC, B+3 78.9VDC, B+4 75.4VDC, B+5 75.2VDC

LED didn't light up—probably not enough voltage there yet.

I didn't take it up to full...dinner time...

Good advice Martin. I do have a variac....

Power section pretty close. Ran out of matching 1R resistors... obviously have to run heater wires... was able to scrounge the switches and pots—used some up in the Trainwreck builds that I forgot to account for! Thanks for all the help guys.

Martin! Thanks for the inspection... really appreciate that. I re-read everything several times—and I could interpret things in more than one way (I know, I know)—I think it's easier for virtual diagnosis If I tell you what I think you are saying? I'm using the ground points as labeled on the #124 l...

Ha! Martin, that’s something (the pink bows) that I stole from the airline industry…where I understand that the zip tie isn’t used due to the fact that they degrade…wire and cable are bundled with that binding “string”… I’m not sure of its composition, it’s got a little tooth/wax? to it and doesn’t ...

Getting sorted.....I'll probably steal Ian's move and add some tabs to support the grid resistors...

Ian, what's the theory behind not running the CTs to ground—since the PT has them? I've tested in other amps CT (if available) vs. the 100R resistors and the CT version was a tad quieter—though hard to tell in practicality—i was under the impression if the PT has them—use them for quietest results—F...

Whoa. (bolts didn't show up... I went to the hardware store, bought what they had and cut them to length—old school ).
Definite insanity—no going back now.

Some chassis holes and layout happened... waiting on the tranny bolts, hopefully tomorrow...then a pic! This is definitely a graduate level amp—lot's going on inside...

Zero worries...

Bolts ordered... what I have in stock have countersunk heads...

Yep... Under board connections are there!