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The overall build quality of the VM amps is pretty good. The low gain channel is fantastic. The high gain tones suck donkey balls. But seriously....for $500, you're getting a good quality chassis, transformers and a headshell plus all the other bits, which is way less than you'd pay for those...

Lots of good info in this thread! The above quote is the ONLY way I would consider implementing this type of mod. Even if you use relays, you need to do it by switching in a parallel resistor so that the B+ to the tube is NEVER interrupted, even momentarily. A properly rated pot is fine too...

Rik Emmet, guitarist and singer for Triumph, a Canadian power trio from the 80's. Lots of vids out there...... Probably the most famous Yamaha SG player other than Carlos. These guitars are actually very high quality, and fly under the radar somewhat. Construction is neck-thru, with the center...

1) there's a problem with the way you've drawn the plate supply and the bias supply. 2) what is the purpose of the 10k between the 2 haves of the plate supply can cap? 3) you have a fet gain stage before the fet follower. No idea whether this will work or not, but you don't need another gain...

Yeah, the greenbacks are always on top. The 55hz H30's sound quite different from the Anniversary 30's, but both sound great mixed with the EVH greenbacks. The cab with the Anni's works really well with amps with diode clipping, or 4 or 5 gain stages. Hat tip to Psycodave for that...

Agree! The EVH greenbacks are fantastic. I have 12 of them lol! Used is an even better deal if yer just after the speakers...... I bought 3 used 4x12s out of the local big box rental stock for $400 each, took out the speakers and flipped the empty cabs for $150 a piece. I have a bunch of great...

Yeah, sure... but you would have to pull the board, as the pots are pcb mounted. The taper on the stock pots is more of an inconvenience than a deal breaker. You just need to be aware of whats going on.

Yeah, I think I put a 100k pot in series with the existing 39k nfb resistor. 39k off the 8ohm tap seemed a bit much. It opens the amp up a bit so it doesn't feel so compressed and dark. The presence pots are audio taper, so that doesn't help either. All the good stuff is bunched up between 1...

Just a heads up: NEVER put El34's or 6CA7's in a 6L6 5153 100watt. The PT was not designed to put out the heater current required by those tubes, and worse, you will likely melt the heater traces on the power supply pcb @ the fuse holders. I've seen this on a couple of occasions, and manged to...

You might have the polarity of the output section reversed, and you are getting positive feedback instead of negative feedback. Looking at the pic, the easiest way to check this would be to reverse the 2 wires between the master vol and the power tube grids. If you ever remove the master and...

Yes sir! Ladies and gentlemen, that right there is one fine sounding musical instrument amplifier. Seriously dude, that amp sounds f'n great! :rawk:

Found these pics on another site. Supposedly the Master vol on a Suhr SL68 MkII. Looks like the pot is shorting the bias splitters. This would increase the negative bias voltage to the power tubes as you turn it down, gradually cold biasing the tubes and slowly turning them pretty much off. It...

My BE100 is from 2015. It has a fat switch to parallel a .022uf cap over the .0022uf coupler, and C45 switch. The C45 switches the voltage dividers, as you said. Position 1 is 68k/68k, and pos 2 is 560k/220k, with 680pf over the 560k. Edit: I typed 280k, it should be 220k.

I was wondering if he has the PI coupling caps connected to the wipers of the dual gang pot. That would keep the effective bias splitter value constant at 117k and the bias stable. Dave has mentioned that when you turn the master down, it loads down the PI.

Should also mention that the max grid resistance for a JJ el84 is 300k in fixed bias, and 1meg in cathode bias, in case you were wondering.....

I thought this was interesting: https://www.aikenamps.com/index.php/what-is-blocking-distortion I think all the likely solutions have been covered. You will have to experiment and see if the issue is in the preamp, power amp, ot both areas. Let us know how it goes!

Just saw the other post. Yeah, blocking distortion for sure, but I think its more likely at the el84. The tone stack is lossy, so there likely is not enough level at the second triode to cause it. You could add a 33k grid stopper between the volume pot and the second triode if you want, but I'd...

I took a look at the schematic. The issue is likely the signal level into the el84. El84's are very easy to drive, and you are hitting the wall on input level. Try a 47k grid stopper in place of the 5.6k and see what happens. If it helps the farting, but changes the tone too much, lower the...

There's a picture in this thread of the output transformer and speaker jacks inside my amp. All you are doing us moving a wire from one jack to another. I don't have any other pictures of the inside of my vh4, and I moved recently and all my gear is still packed up. I won't be taking the amp...

Yes I do! A lot of stuff has come and gone, but I don't expect to ever sell the vh4. Great amp, and yes, it still has the nfb mod : )