Quote:
Originally Posted by dewickt
Last version was the MC2505-2, the best of the bunch !! I expect the serial number to be in the range starting at 36K00, you may find it inside on the chassis if you remove the bottom cover. In as is condition it should sound good, with a recap it will open up some and improve on it's imaging and presence.
Serial number was ink stamped on, it is easy to get to over ambitious cleaning and wipe it off with Windex or a slightly abrasive polish.
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I got it turned over and removed the lower cover/half-chassis. It had lots of dust on the inside-bottom of cover. There appears to be quite a bit of tiny metal chips inside the chassis, probably from the cover screw threads. I'm going to blow out the inside with regulated compressed air. Thinking of using windex to hit the cover with, but heard it's too volatile.
None of the PC board part numbers match the schematic, and the circuit layouts are vastly different. Same with power supply!! All of the lamps work and it generally looks real good inside, that is for a '60s assembly job.
Here are the board part numbers:
Input Section: 043795, on schematic: 043-854
Output boards: 043916, on schematic: 043-855
My service manual isn't much use--only in a general way. The first step is to order the appropriate service manual but no serial number was found inside. It may be tricky to get at all of the components, and it's not certain if the power supply cans need, or should be replaced. Still wondering whether to go ahead, send it out, or do nothing.
-Gregory