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i have a vintage Yamaha guitar g100b 212 amplifier powers up

 
stereoaz's Avatar
  • Answered by:stereoaz
  • Technician
  • Positive Feedback: 100.0 %
  • Accepted Answers: 27
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in Electronic Musical Instruments

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Customer Question

i have a vintage Yamaha guitar g100b 212 amplifier powers up i get sound for 5-6 min then begins to distort and then fads to no sound. Power supply? and were can I get a replacement

 

Optional Information:
Make: yamaha
Model: g100b-212

Submitted: 271 days and 6 hours ago.
Category: Electronic Musical Instruments
Value: $28
Status: CLOSED

Accepted Answer

Picture
Expert:  stereoaz replied 270 days and 21 hours ago.


stereoaz :

i would look at the resistor that feed the power transistor. may have a bias problem or overheating causing it to distort

Customer :

I wouldn't know how to do that any suggections

stereoaz :

you would need to know basic troubleshooting and have a multimeter.if there is any hum it could also need filter capacitors.sorry i could not help more.

Expert TypeTechnician
Category: Electronic Musical Instruments
Pos. Feedback: 100.0 %
Accepts: 27
Answered: 7/9/2012

Experience: 20 years repairing electronic musical instruments,amplifiers,speakers.

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