The Amp Garage

They also need to be mounted right next to each other so that all wire length used is the shortest. Also I consider the leads of semiconductors as part of its built in heat sink and as such contributing to the items wattage rating. For Zener diodes used in tube amps ( especially if near the output ...

bcmatt wrote: ↑Tue May 07, 2024 5:59 pm

FUCHSAUDIO wrote: ↑Tue May 07, 2024 4:31 pm No reason you can't. I would add a 100 ohm series gate resistor on each, and also keep the 10 ohm source resistors on each, the input drain leads can simply tie to the same point.

So, like this?
2Mosfet.jpg

YUP.

No reason you can't. I would add a 100 ohm series gate resistor on each, and also keep the 10 ohm source resistors on each, the input drain leads can simply tie to the same point.

Anyone know anything about this ? : <iframe src="https://www.facebook.com/plugins/post.php?href=https%3A%2F%2Fwww.facebook.com%2FTrainwreckCircuitsAmplifiers%2Fposts%2Fpfbid029g1UF3x1sESLcEegnVKVZSSZhTWcyC8wMPNSSHRGdwByZHHhnbuzLLUJM5VhPxGml&show_text=true&width=500" width="500" height="818" style="b...

Peavey made tons of 5150's with the cathode caps installed in reverse....I can only imagine how many.

xtian wrote: ↑Tue Jan 16, 2024 4:48 pm Be aware of wires running along the chassis--mechanical vibration during play can make them rattle.

Ampeg used contact cement liberally on the old Jersey builds. They used solid core wire dressed down against the chassis, and then a coating of rubber cement to stop movement.

I’ve had great success with the F&T caps. Just be sure to put a dab of silicone between the cap and circuit board to hold them down. In the bigger Fenders with the doghouse cover the foam block won’t contact the smaller F&Ts and the leads can break. I’ve repaired a few. The wire gauge and electro s...

I am very curious about the mojotone caps , didn’t know about them , thanks for sharing that suggestion Andy I've had pretty good experiences with Mojotone electrolytic caps, but my sample size is pretty small; I've used and installed about 5 radial multi-section cans and about another 6 axial elec...

FWIW: I usually unclip the output transformer CT wire from the main board, and use clip leads and a 1-ohm resistor. Same with Blues Juniors. If the bias is where it should be (or close), I don't mess with a trimmer. If we're doing an overhaul (cap job and tweaks etc), I'll add a ten turn pot with a ...

I may stand corrected: I believe the caps Freidman had issues with were A R S not A E S... just changed out a batch in a Marshall from 2003. We do work for Boutique amps and saw our share of leaking or simply open caps causing all kinds of fun. No idea how or why Marshall would use ARS caps from a d...

At work last month a recapped a Friedman that was no more then 4 years old. It was built with a 2 section can cap from AES and was already swelling up pretty well. Whatever brand filters AES relabeled as theirs seem to suck! I hope it’s not CE! I’ve used many CE cap cans in the last few years with ...

Do a google search for Hayseed Hamfest... Wow, they have really dressed up their site! Catering to the Ham and Hi-Fi crowd, mostly. I use them regularly for Silvertone, Danelectro, Valco, and similar amps using the smaller size. I would rather not open up the chassis holes, especially on older, rar...

Do a google search for Hayseed Hamfest. They custom make quad caps and these smaller 3-section caps as used in Valco, Supro, and Silvertone amps (and likely others).

Due to the high plate voltage (around 700 volts) the screens are at 50% of that, and the bias is low (about 20 ma per tube). The bias is measured at the 3.9 ohm emitter resistor and the Pacair schematics and tech notes explain what you are looking for. Matched tubes is a good idea, and quality tube...

Due to the high plate voltage (around 700 volts) the screens are at 50% of that, and the bias is low (about 20 ma per tube). The bias is measured at the 3.9 ohm emitter resistor and the Pacair schematics and tech notes explain what you are looking for. Matched tubes is a good idea, and quality tubes...