Hi Folks,
Long time lurker here, first time poster...
Picked up a very rusty MC250 today. Got it for a very reasonable price given the condition and thought it would be an interesting project knowing there would be gremlins. I need a winter project. First time working on a Mac power amp, but I have recapped my C26 before with no problems. Any pointers to a newbie working on these power amps would be much appreciated. I have much experience working on tube guitar amps but this is new ground for me. Gentleman I purchased it from acquired it from his job cleaning houses, he said he tried to get it to work but didn't get any sound out of it. I haven't tried to power it up yet.
This thing is very very rusty, but seems to mostly be surface corrosion. Is there a preferred method of taking the rust off? I keep seeing that Wenol or Barkeeper's Friend is the best move? I think a good majority of the screenprinting can be saved.
The internals all look very good, no scorches or burns, however one of the output power boards is cracked. This would be my guess why this thing was left to rust. There are 3 traces that are broken. Is there a better way of approaching this repair than just epoxying the board, stripping back the trace overlay, and flowing solder? I've used this approach a few times with guitar amps.The number on the board is 128-062. Is it crazy to maybe think someone may have a replacement board?
Can someone also please enlighten me on the circuit breaker? Should this read closed with no power?
Will start recapping in the interim...however, where would the experts here start? Or a better question, is this a project worth undertaking?
Forgive my ignorance on this subject and hope to get this 250 up and running again!
Many thanks!
Long time lurker here, first time poster...
Picked up a very rusty MC250 today. Got it for a very reasonable price given the condition and thought it would be an interesting project knowing there would be gremlins. I need a winter project. First time working on a Mac power amp, but I have recapped my C26 before with no problems. Any pointers to a newbie working on these power amps would be much appreciated. I have much experience working on tube guitar amps but this is new ground for me. Gentleman I purchased it from acquired it from his job cleaning houses, he said he tried to get it to work but didn't get any sound out of it. I haven't tried to power it up yet.
This thing is very very rusty, but seems to mostly be surface corrosion. Is there a preferred method of taking the rust off? I keep seeing that Wenol or Barkeeper's Friend is the best move? I think a good majority of the screenprinting can be saved.
The internals all look very good, no scorches or burns, however one of the output power boards is cracked. This would be my guess why this thing was left to rust. There are 3 traces that are broken. Is there a better way of approaching this repair than just epoxying the board, stripping back the trace overlay, and flowing solder? I've used this approach a few times with guitar amps.The number on the board is 128-062. Is it crazy to maybe think someone may have a replacement board?
Can someone also please enlighten me on the circuit breaker? Should this read closed with no power?
Will start recapping in the interim...however, where would the experts here start? Or a better question, is this a project worth undertaking?
Forgive my ignorance on this subject and hope to get this 250 up and running again!
Many thanks!