OK Then

[Tone Meister]

Oh I am all for you figuring it out, I am interested too.

I was thinking about cleaning up the mess, it seems that just rebuilding might make more sense. But DO solve the problem first.

And I am all about gutting it and rebuilding it right on an eyelet board. As soon as we figure this out, that is exactly what I'll do. The soldering is amateur and as pointed out above, some of the wiring and component placement are poorly implemented.

[nosaj]

And I am all about gutting it and rebuilding it right on an eyelet board. As soon as we figure this out, that is exactly what I'll do. The soldering is amateur and as pointed out above, some of the wiring and component placement are poorly implemented.

Don't underestimate the resistance of a bad solder joint.

nosaj

Just thinking out loud...using a scope at the input then input of 12ax7 and so on. You could see the signal size increase and at some point see it choke out.

[Tone Meister]

"Also, the NFR is 1.4K and not 22K."

A few posts earlier you said it was 22k measured out of circuit?

Yes, it was under heatshrink so I had measured it in cirxuit amd got 1.4k. Out of circuit it measures 22k.

[Tone Meister]

There are lots of ways to lower output. Also check to see if they are running the 6V6 in triode mode. Is the screen connected like the original schematic?

6V6 is wired normal as in that.photo

[nosaj]

6V6 is wired normal as in that.photo

And the volume pot?
nosaj

[Tone Meister]

Don't underestimate the resistance of a bad solder joint.

nosaj

Just thinking out loud...using a scope at the input then input of 12ax7 and so on. You could see the signal size increase and at some point see it choke out.

The amp works fine and sounds fine. It was purposely built for 1 watt output but the new owner (my buddy) now wants full output.

[Tone Meister]

And the volume pot?
nosaj

The volume pot is 1 Meg audio taper, switched

[nosaj]

The amp works fine and sounds fine. It was purposely built for 1 watt output but the new owner (my buddy) now wants full output.

Scope might make it faster and easier to see the signal changes throughout the amp. IT's being choked or throttled at 1 watt output somewhere
nosaj

[Tone Meister]

Scope might make it faster and easier to see the signal changes throughout the amp. IT's being choked or throttled at 1 watt output somewhere
nosaj

https://music-electronics-forum.com/...ad.php?t=48333

I don't have a scope at present. Mine was killed over the summer. Got one incoming, but not today.

[nosaj]

https://music-electronics-forum.com/...ad.php?t=48333

I don't have a scope at present. Mine was killed over the summer. Got one incoming, but not today.

And the value of the input resistors?
nosaj

[The Dude]

In the first picture in post #20, there looks to be a 100 ohm resistor (about middle of pic) going to a pin of the 5Y3. Can you tell us if it is indeed 100 ohm and where it actually goes.

Edit: Or maybe it just looks like 100 ohm in the pic and it's actually a 10K?

[Tone Meister]

In the first picture in post #20, there looks to be a 100 ohm resistor (about middle of pic) going to a pin of the 5Y3. Can you tell us if it is indeed 100 ohm and where it actually goes.

Edit: Or maybe it just looks like 100 ohm in the pic and it's actually the 10K?

That is a 10K dropping resistor and it goes from the 5Y3 to the 6V6 screen

[Tone Meister]

And the value of the input resistors?
nosaj

Both are 68K. Blue, Gray, Orange

[nosaj]

Both are 68K. Blue, Gray, Orange

[ATTACH=CONFIG]52281[/ATTACH]

Ok I'm counting 4 resistors out of 12 or so that have been measured. Almost halfway there, might as well start measuring them all and making your own schematic for this one.

nosaj

[mozz]

Leadfree solder + somebody who can't solder = mess.