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jakub421 13th September 2012 03:03 AM

Problem with Yamaha RA-200 amp! Please help!
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Hi everybody. I recently bought a vintage Yamaha RA-200 from a guy, he said its about early to mid 70's. This amp actually has 3 amplifiers. 1 for rotating speakers, and two for the top and bottom half of the 4x12s. Now the problem is that in one of the amps for the 4x12, one transistor (2SC783) started getting really hot and the sound started distorting. Now I have no idea what the problem is, and I want to get it fixed. I checked the resistors going to the base, and they are good. I also checked the power transistors TR6 and TR7, and they are working fine, so I don't know what else could be the problem. Thanks for any help!

The transistor is labeled TR4 on the schematic.

Enzo 13th September 2012 05:31 AM

This is an instrumemt amp, not a hifi amp, so they may move this to the proper section of the forum. So look down there if it disappears up here.

I saw this over at SSGuitar first, and responded there.

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