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@Keyman69, Quoting descriptions from another member Dominic, @zumbini, How we got to the different versions of the PM-1.5... "fan failures were common in early PM-1.5s". These amps were recalled and repaired and the revised amp sold as the PM-1.5a / PM-1200." "The PM-1200 and it's predecessor the PM-1.5 are basically an M-1.5 with larger output devices, balanced inputs and fan cooling. Should be no surprise that they sound alike." We love repair threads..., and lots of pictures. Consider posting yours in the Amp forum! 😉 others may benefit, and yet others, may chime in with help.

Welcome, @Keyman69, glad you found us. Also, to support your project, be sure to download the service manual. The Carver PM 1.5 has two incarnations..., the second to address issues in the first version - both are good - but the reading will help identify which you have, and how to proceed. Check out these two Service Manuals as your proceed.

@sea, here on The Carver Site, may not check here daily - but can also be found via a DM on Facebook, look for "Ed Atkins" Super great guy, and is the only go-to for ribbon repair for Carver amazings that has the correct jigs required to re-assemble them, holding the powerful magnets in place..., it's not possible to reassemble without the jigs.

Just bought Boards of Canada new album Inferno .

Thanks for the offer. We love it when people help to build and maintain the complete development of the library. If the copy you purchased is cleaner than the scan we have on file, in the locationed indicated below in the image, we're always happy to improve the library too - some of our scans are not perfect - this one looks pretty good - but do a quick eyeball check to compare with the one you picked up. If it's better, we'd love a clean scan. Thank you for offering it up to improve the library!

Thelonious Monk The Genius Of Modern Music Vol 2 (Album)

Theloniuos Monk The Genius Of Modern Music Vol 1 (Album)

Hello Keyman69 and welcome to thecarversite.com. Glad you found us! I wish I could help you with your questions, but I am by no stretch of the imagination a tech. I'm more of a magician. I could turn an amp into a brick, door stop, or boat anchor. Good luck with your repair!

Hello SteveSC and welcome to thecarversite.com. Glad you found us! As others have mentioned, @sea is the goto guy for Carver ribbons.

My daily dose. The Rippingtons, Brave New World (album)

@Roland gs - I have a pair of ALS III’s that started to emit a buzz, about 14 years ago or so. I got a rebuilt pair of ribbons from Ed (on exchange) and they have been excellent ever since. It is well worth the money. I also rebuilt the crossovers (new caps only) more recently after confirming a couple caps had failed.

Stevie Ray Vaughn & Double Trouble Texas Flood (Album)

Willie Nelson And Then I Wrote (Album)

Agree with @3M_Audio. You can't go wrong with the Micsig line. Reliable all day long. I've read the Hantek HT8050 is also fairly good but is only a 50MHz probe..

Welcome!!!

Welcome!!!

Welcome! When you talk about isolating your scope are you thinking about a high voltage differential probe? I have the Micsig DP10007 and it's worked well for me when I need to measure a voltage difference at two points not at ground potential.

Welcome. I messaged sea a couple days ago about my silvers (3 woofers). I'm having a buzz out of one of my 48" ribbons at certain frequencies. After reading through a bunch of threads it seems he may be our saving grace.

Welcome to TCS!

Welcome to TCS!

Reach out to Ed - @sea , as he has the ability to refresh/repair the ribbon tweeters. Also, if you have 4x woofers in each speaker, I don’t think you have Silvers (they have 3x woofers)…

Welcome from Virginia! Enjoy your stay!

Welcome from Virginia! Enjoy your stay!

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.