• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

Pioneer M-22 repair- Michigan local(48383)

moookie1051

moookie1051

New Member
I've got a very loud buzzing, chattering sound from 1 of the 2 transformers on the chassis, upon powering on, AFAIK. It's not audible through the attached speakers. It goes away almost completely after operating for 20 minutes or so, but seems to buzz/clatter longer each time I use it. I'm looking for a local (48383) repair site, within 20-30 miles. Anyone familiar with Clearview Electronics in Keego Harbor ? I don't want to spend a fortune on repairs, $100-$200 would be acceptable . :sigh:
 
Register to hide this ad
I sure hope you can get that M-22 Class A beast repaired! I've always wanted to see/hear one. Depending upon what's wrong I think you'll end up being much closer to $200 than $100 but it's worth the investment I would think. Best of luck!
 
For most "electronic" repair shops, the M-22 is uncharted territory and you can expect to get worked pretty hard for repair and even then wonder about the quality of the repair. I'd find an AK'er to repair it and either drive it or ship it to him. These are valuable to warrant a correct and careful repair.
 
Funny, M-22 is a somewhat famous highway in Michigan, and I found this thread title confusing ;)
 
For general comparison, it cost me $275 to get my M-25 repaired by a reputable vintage audio tech here in Raleigh. Mine had broken circuit traces on one channel's board -- not the same problem your amp has.

But the cost felt well worth it because these are some of Pioneer's most beautiful machines, and I love the sound of the M-25. Hope you get yours running properly!
 
Thanks for all the quick replies. I've sent a message to Punker X requesting his assistance. Awaiting a response.:tresbon:
 
That's the soft-start relay chattering, not a transformer. The circuit includes an electrolytic cap, which is certainly way past its prime.
 
As best that I can tell, I need to replace C42, a NP 22ufd 160v electrolytic, which is connected across the coil of RL1. Hope that is correct.
 
Last edited:
I can guarantee you that, unless the unit has been recapped before, it's due now. You'll likely be hard pressed to find a single electrolytic in the amp that isn't on its last legs.

I replaced C42 with a 20µf 250V film cap (a Dayton or a Solen from Parts Express, IIRC). Too hard to find a 22µf 160V NP electro.
 
I have a M-25 and when I first got it (about 9 months ago) I initially powered it up on the DBT, and it chattered as well. No matter what wattage bulb I put in the DBT, it chattered. On full power, it is fine and no issues. And yes, as EW stated, it is the soft start relay not getting enough "juice" to hold it in.

I would do a complete recap on it and that will likely take care of your issue. I intend to do this with mine eventually. And a recap is not complex on this amp. The Big Cans are the tricky ones, cause they are an aesthetic part of the amp/s. There are tricks to hollowing out the originals and putting modern replacements inside them to keep the original look. But the Big Cans are not the real issue with the relay chatter.
 
You must log in or register to reply here.
Back
Top Bottom