The Amp Garage

OK, I have the NFB ironed out. Reversed primaries. Pretty darn quiet now. Just have some dimed hf oscillations to deal with now. The usual treble and presence whistles. Tomorrow, (damn, it is tomorrow....) when I get up, will go at it again with the express build guide, and swap some wire locations ...

Thanks, In other builds if there was a reversed primary it would let you know on turn on. Since the presence pot is a turn switch-on, and I fired it up with it off.....no squeal until I turned on to adjust presence. That must be it and an easy fix. Warming up the iron now.............thanx again. I ...

Move nfb to other side of the OT? It worked fine in other circuit (Marshall 1986 circuit) which is identical to what is there now except rather than 47K NFB resistor there is a 100K on the TW circuit now. All of the PI on back to the output, is the same, with the exception of 82K/100K of PI are the ...

Howdy, I have a chassis that I use for experimental circuits. The last was a Plexi type that worked well. Use a switched presence pot to turn off NFB to see/hear effects of in/out circuit. The Trannys are from old tube integrated amp with 8K OT and big PT with volt doubler out of neccessity from ori...

Yup, it is easy to take a minute and check the bias..... always a good idea.

FYL The setup you described, what would you compare this sounding like? What value choke do you recommend? Don't have any chokes on hand, been building things without them lately. As my parts stash grows more, I will build a TW Clone next year. I just feel like building something different from the ...

How about an Express that can run 34's 6v6 and 6L6. I have trannies, old tubes and parts for a 6L6 build. What do you guys think? Thanx

OK, your info on the tranny diagrams just popped up......

oooooppppps

Isn't the OT supposed to be a 3.3K? Might minimize the balancing act.
Oh, what is the turn time on Edcor being quoted? Mike

Hey Mark,

Thanx for the tranny info. It is still a couple weeks out for me to order, but I will. Are you having any type of color coding with the wires? Or just stock?
Mike

Hi guys, I really want to build this 80 watter. Is there a current rev of the layout and BOM, and Schemo for this? I found one earlier one, don't know if it is a final version. Also thinking of a half power switch to cut two of the El's off when wanted. Any word on the Edcor trannies? I am pretty ex...