Tube Amps / Music Electronics
|For current discussions, please visit Music Electronics Forum.||New: view Recent Searches.
New: visit Schematic Hell!
The sunn still shines online!
|Listen to great tunes streaming live right now!|
|3/29/2006 5:25 PM|
|Lee||Yamaha YTA 95|
I've just aquired this amp in a non-working condition. It's a 100w(?) solid state 2x12 combo from the late 70's/early 8o's. I plugged it in and got a loud continous hum (this is unaffected by changing settings/turning pots etc). The guy I got it from said it's been in a cupboard for years. He said the last time it was working it just cut out and never worked again. This is all I know about the amp and after hours and hours of internet searches, I have found zero info on this model. Can anyone shed any light on what may be the problem or how to go about diagnosing it? Any info at all about this amp would be gratefully received. Many Thanks.
|3/29/2006 6:52 PM|
You can probably buy the service manual from Yamaha.
Those solid state amps are pretty generic. Your "loud hum" may be DC on the speaker. Does the cone move one way and stay there when you power up the amp? Or disconnect the speaker and power up and see if DC sits on the speaker wires.
If so, you likely have a shorted output transistor.
Otherwise, I'd be looking for a bad filter cap, or one cracked free of its solder.
|Book Of The Day||
The Ultimate Tone, Volume III by Kevin O'Connor
Note: The Ampage Archive is an Amazon Associate site. A small commission is paid to the site owner on any qualified purchase made after clicking an associate link such as the one above.
|3/30/2006 1:53 PM|
Many thanks for the reply. I'll use that as a starting point. Fingers crossed!
|Page 1 of 1|