Crate BX-220H

[nanodocl]

Hi everyone,

I am having trouble fixing a crate BX-220. No sound came out of the output stage, but mosfet seems to be ok. Preamp seems to be ok as well.
Any tips or schematic will be appreciate.

[The Dude]

I don't have a schematic, but I know these things have both an effects loop and a preamp/power amp "loop". You could just have bad or dirty switching jacks. Try inserting a cable in each loop (send to return) and see if it works. If it doesn't work, those jacks are a good way to determine if the problem is in the preamp or power amp section. Plug a signal into the "power amp in" jack and see if you get sound. You can also plug the preamp out into another amp to see if your preamp section works. Again, I'd start by checking both loops with a cable. You may not even need to chase down a schematic.

[nanodocl]

I did tried out that before with no luck. Thanks anyway,
I will have a better look tomorrow and see with other perspective.
Due to similarity , I was wondering if this amp has an Ampeg "brother" to look up..

[Jazz P Bass]

Maybe the BT-220 is close?
It has MosFet output devices.

[nanodocl]

Thanks JPB, I will check similarities and let you know.

[dmeek]

Here it is:

http://music-electronics-forum.com/a...1&d=1370993254

http://music-electronics-forum.com/a...1&d=1370993254

Doug

[nanodocl]

Here it is:

http://music-electronics-forum.com/a...1&d=1370993254

http://music-electronics-forum.com/a...1&d=1370993254

Doug

Thanks so much....hope I can fix it!