Keyman69

After replacing the power supply capacitors which were an interesting dual cap model with 4 Nichicons from Mouser of the same values and best esr profile I could get, the amplifier came back to life. I made a PC perf proto-board replacement to hold the 4 capacitors modeled after the one sold on Ebay, soldered some stiff wires into the perf board, and fitted it in to replace the old capacitors. I will still need to give it stress test, but all appears to be good now. The hardest part was getting the old caps out, which I did by a combination of cutting the legs with a dremeal tool and removing the remaining soldered stubs and cleaned the wholes needed for the replacement board.

Thanks for the welcomes What I did for isolation was to purchase a battery powered very simple scope that does not connect to AC except to charge it. I still need a few more things before I can install the power supply caps. Hope to do that after an order arrives in about 2 weeks. I am on in the DR and everything gets to me on Island Time

Thanks for the welcomes What I did for isolation was to purchase a battery powered very simple scope that does not connect to AC except to charge it. I still need a few more things before I can install the power supply caps. Hope to do that after an order arrives in about 2 weeks. I am on in the DR and everything gets to me on Island Time

Hello everyone, I am a retired electronics design engineer who designed mostly digital and embedded microprocessor designs with a smattering of some analog circuits along the way. The Carver PM-1.5 is quite the challenge. I bought it many years ago and it worked well until the large power supply capacitors failed. I replaced them and it worked for quite a while longer and failed some years ago. I removed the dual power supply caps and found they had failed which is at least part of the problem. Now I am looking at sourcing replacements for them ( I have seen the EBAY replacement board with 4 caps), but I will probably make my own. Then I will see what else is wrong with it if I am able to . I appreciate any suggestions along the way. Especially how I can isolate my digital oscilloscope so I can use it to safely view wave-forms should I get that far. I have a Variac specially for this, but have never had the issue of needing to also isolate a 'scope to make measurements. Ways to do that would be greatly appreciated and thanks ahead of time if any one out there has the way.