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-   -   US Amps USA400 (http://www.diyaudio.com/forums/car-audio/233812-us-amps-usa400.html)

shawnk 9th April 2013 11:05 PM

US Amps USA400
 
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!

Perry Babin 10th April 2013 12:15 AM

Arrow has the originals.

If you want to use the 3205s, I'd suggest 47 ohm resistors.

shawnk 10th April 2013 12:37 AM

Thanks Perry.

I've never heard of Arrow so it's nice to find another vendor!

I'll check it out.

Perry Babin 10th April 2013 01:40 AM

arrownac.com

If you register (free), the prices are a bit better.

Tom7227 13th April 2013 12:15 AM

Beware of there shipping costs

Tom7227 13th April 2013 12:18 AM

Isn't that a THRILL getting apart?

shawnk 13th April 2013 01:07 AM

Quote:

Originally Posted by Tom7227 (Post 3452130)
Isn't that a THRILL getting apart?

?? Actually, I think it's one of the easier amps to disassemble :)

Tom7227 13th April 2013 06:20 PM

Quote:

Originally Posted by shawnk (Post 3452193)
?? Actually, I think it's one of the easier amps to disassemble :)

I thought that was the 4 foot long amp, that slides out with 75 different semiconductors pulling the mica insulators.

:)

shawnk 14th April 2013 02:02 PM

Quote:

Originally Posted by Tom7227 (Post 3453064)
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 :D

Derick12530 18th April 2013 09:42 AM

Anyone ever worked on a us amps vlx400


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