The Amp Garage

Mark, thanks I'll change that resistor out.

Steve, that's a lot more than I have but good to know.

Ok back to work.....

Steve

Thanks I'll try that. Yes my voltage was on -20 to -25 volts...

Steve

Yeah I will. But old full wave type recto. And never worked with EL34 s before either.

Gents, OK only my second amp with a fixed bias supply so bear with me. It's a Marshall type supply HT into 220K - Diode - 15K to 10K pot with a 47K to ground. El34's 25W/385 plate x.70% = 45ma. Lowest I can go is 85 ma which is over 100%. So changing out the 15K is the way to go?? Increasing that re...

OK got the power supply done, bias supply done, Tone board in and wired.
Just the output left to go...yes!!

So as I continue to work towards my title of "Worlds Slowest Vox Amp Builder" I did actually get something done on my VOX AC50. Like the power supply / bias supply board. And the input / tone / PI board. Looks over populated as it has two AC30 (TW Rocket) tone circuits. One for the Bright channel an...

John

Thanks, I thought it was switching one or the other but see it now, doh!

Hey Mark,

Sir, I see what switch 2 does bringing in a bypass cap.
But what does switch 1 do? It looks like you're choosing another resistor but it's the same as the one already in the circuit....

Thanks

So with warmer weather hitting I was able to get back to the basement this week and continue on with the AC50 build.

The circuit boards fit and the front panel and pots etc are also fitted.
Been so long I gotta go over the design again and see if I got it right...

Oh yeah!!

This my kinda amp, beautiful work...

Ryan

Thanks.
The one I was "scoping out" was a 30 Mhz model 4 channel with usb too.
Good heads up on the 100x probe that's why I asked here...

Martin

Thanks. Also good reminder to look for a dummy load. A 1k sine
wave can be very annoying thru a 12 inch speaker...

Guys Our small r&d lab is closing so I have a chance to pick up a scope cheap. What specs should I be looking for in a scope for tube amp work? Most of the ones have been used for high freq work, but I wouldn't need that right? Also there are some freq generators available and I'd need one of those ...

Nice grouping!

Woo Hoo!
I got an Empress Nebula vib/chorus/flanger pedal. Sounds great and has a bunch of memory locations that store your settings for easy live usage.

Also a bunch of Humble Pie early, Frampton era, cd's. Includes all four shows of the Rocking the Fillmore album...