This amp uses 75344p (TO220) fets for the power supply. All fets are shorted and all gate resistors are burned to a crisp.
None of my trusted vendors have the 75344's in stock so I'd like to confirm that the IRF3205 would make a good substitute. It appears to be a perfect match!
Lastly, I'd like input on a good value to use for the gate resistors.
Thanks!
None of my trusted vendors have the 75344's in stock so I'd like to confirm that the IRF3205 would make a good substitute. It appears to be a perfect match!
Lastly, I'd like input on a good value to use for the gate resistors.
Thanks!
I thought that was the 4 foot long amp, that slides out with 75 different semiconductors pulling the mica insulators.
🙂
hehe! You're thinking of the VLX400 which is actually TWO of these bad boys in one chassis. Yeah, I can imagine that would be quite a pita to try and remove from the sink 😀
Yep. Once. It took up the whole bench. I had to bring a table up to the bench to slide the boards out. I spent a lot of time bending each transistor forward slightly to clear the insulators.
That was over 15 years ago. I don't have that kind of patience now. 🙄
you never wanna work on a vlx 400
and i heard theres alot of special must know's and only the us amp parts work anything else just blows it
only a few ppl are qualified and not many more know enoff to do it right
and i heard theres alot of special must know's and only the us amp parts work anything else just blows it
only a few ppl are qualified and not many more know enoff to do it right
Not in my experience. USAmps used some of the most common parts available with the exception of their SAT (just a PICMicro). Then again, if you're not experienced I would never recommend repairing any amplifier with that much power capability. A current limited power supply is a must. At that power level, I would power up the audio stage and power supply stages separately to ensure everything was correct outside the heatsink.
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