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I did some more work on this a few years ago, and wound up with this. More of a JCM 800 on Ch 2.

Yup...That did the trick. Thanks Pete!

I have tried three different sets of brand new tubes.

I've been doing that. I also re-soldered anything that looked even a bit questionable. At the beginning of the summer, I spaced and left the amp on overnight. It developed a number of issues, which I was sure I'd fixed, I also put in a new set of tubes. Dang! This is frustrating. I do appreciate...

It doesn't seem to happen when I have the amp on the bench. Thanks Pete!

OK, I may have spoken too soon. The amp is still producing a lot of static when I hit a certain volume. I can almost always make it happen if I play a C or C#. It comes in when the note tails off. I went through the amp this morning with a wooden probe and tapped every connection with no...

One of the 1ohm resistors was dead. Replaced it, and now everything is back to normal. Thanks all!

Adjustable bias via a potentiometer. I'll check the caps. Thanks.

I have an amp I built years ago in a Princeton chassis. It's been my favorite over the years, but lately, it started adding static at the end of notes when I got to stage volume. It's a basic Fender Deluxe NR type circuit, and I added 1ohm resistors off the cathodes of the 6V6 tubes going to...

I sorted out a few more things on this. Mainly where to run leads to the Vactrols to get the correct tube order. The illustration below shows the Vactrols as they appear from the back of the amp looking at the circuit board. I numbered them from left to right. Wound up with more gain than I knew...

PHILLYGTR: Kind of your call. For myself, I wanted something that was suitable to the styles of music I play. The original design didn't float my boat, so I fixed it. :) It's been a fascinating journey so far.

Greetings! I tore into the old Concert this week. There were some errors in my original mod. Moving the Volume from the last gain stage on the drive channel to directly following the treble pot made a big improvement. Once I fixed those, I realized that while the amp sounded great, it lacked...

Get a Quilter TB101. Not a tube amp. doesn't sound like one either. Sounds great as it is. 50W, 4 pounds, $300. Great with pedals.

I have a DV Mark Micro 50 on the way.

That's why we invented questions.

http://elektrotanya.com/PREVIEWS/63463243/23432455/egyeb/crate_palomino_v16.pdf_1.png If clipping C3 doesn't help enough, try adding the .001uf snubber cap across the plate resistor of V1b.

If you're using a 5AR4c rectifier and getting 483VDC with tubes installed, what are your filter caps rated for? You can have a nice little fireworks show if you exceed the voltage rating on those E-caps. Stop defending your choice of rectifier tube, and take the advice of these people who are...

Good point here. I have old outlets in my garage linked to the new outlets with the built in breaker. I rarely trip my breaker box, but if something goes wonky, I have to check all the outlets with breakers to find the problem.

Yes. A 12AX7 is a perfect replacement for a 7025. The 7025 is simply a "quieter" version of the 12AX7.

Did you measure the hot contact of each socket for voltage? That will be a huge clue.

So very true. Which is why I get such a kick out all the "What's the best (speaker, pre-amp tube, capacitor, banana, etc) for a (insert name of amp here)..." types of questions. As in life itself, there are no black and white answers, only shades of gray. :) I have an Allen Accomplice that has...

My tools look similar to this...

It's called "Heatshrink" do a search for that. It comes in all colors (mainly black), and different tubing widths. Scroll down a ways on this page: http://hoffmanamps.com/MyStore/perlshop.cgi?ACTION=enter&template&thispage=WireCable&ORDER_ID=!ORDERID!

That ticking noise made me crazy until I discovered the source! :) Can we assume you've done some tube changes? I wonder if we can possibly be discussing the sound of a faulty cap charging and discharging?

I totally suck at woodworking and metal fab. A lack of proper tools contributes to that, and a lack of patience rounds it out. My cabs look like something from the Bizarro world. Sawdust and metal shavings tend to collect around the area where I work on amps. My cheesy vacuum can never get them...