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Requesting Technical Assistance

Hello, 

I am bummed out. Yesterday I smoked the left channel on my vintage Fisher MC-4022 receiver. This is more sentimental than anything else. My late father gave this to me on my birthday back in 1978. How it happened, I was cleaning my garage and the speaker wire came disconnected from the speaker and shorted out the channel.  What do I do to fix this?

 

128x128joeradio
jasonbourne71's avatar
jasonbourne71
827 posts
 

You may contact Audio Classics in Vestal, NY. They do repairs/restorations.

fuzztone's avatar
fuzztone
5,502 posts
 

R and R the power transistor.

joeradio's avatar
joeradio OP
41 posts
 

Would rhe power transistors be marked LA4250 G4 and LA4250 9C4?

noromance's avatar
noromance
9,458 posts
 

@joeradio Have you tried both the A and B speaker outputs? There are 4 amplifiers in this unit, so you may have only damaged one. Ensure you select the A or B set from the from control.

bdp24's avatar
bdp24
9,451 posts
 

You may have just popped a fuse, assuming the Fisher employs them in a location where the hot & ground speaker wires touching would do so. Check for a fuse, and if that's the culprit just replace it.

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