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My tech, who's been very good over the years has narrowed down my left channel distortion to the amp board on my mcs 3125 receiver. He has the service manual and says the exact parts he needs are no longer available and fears using interchange parts will cause other problems. He's posted parts wanted. Opinions on interchange parts please
Follow Ups:
While de-cluttering, I came across a Rolling Stone from 1981. Flipped through the pages and came across this ad.
There are also ads for VHS and BETA recorders, $1035 each. Talk about a rich man's hobby!
Finally got part numbers. He says some of these are available and some not.
2sa733
2sb706
2sd746
2sd381
2sb536
2sc941
2sa916
220 80v cap
This is easy. i probably got perfect ones in stock. Lt e look them all up to be sure but this is really not a problem.
None of them are a problem except one with an unusually high Vce rating.
Ok. Can I buy them from you? Which is the problem part and is there a sub for it?
Thanks
Check here:
https://www.smps.us/components.html
or here:
https://www.sourceresearch.com/cross-reference.cfm
or here:
https://www.nteinc.com/quickcross/
or just google this:
electronic part substitution guide
Used to have a parts cross reference tool that you could put in the part you are looking for and it would match up the closest part to the original. Have your tech go there or check on the net. I'm sure there are some out there. That receiver was most likely made by Technics so it should have parts that are offered some where, maybe not in quantity of one. It will take some searching.
Edits: 01/11/21
Let's narrow this down?
Resistors / Capacitors should be directly interchangeable.
MOST semiconductors, too. Look at the data sheet for any warning signs.
Inductors?
What else is there?
Opamps? Repalce in L/R at the same time with same part.
Too much is never enough
Sorry everyone for not checking this post. I'm going to find out what exact parts he's looking for tomorrow. Thanks for the advice
As others have mentioned, unless you list the parts there is no way to provide an informed answer.
For a receiver like this its no worries whatsoever.
...when someone asks for help and then disappears from the discussion.
Just because it was sold at JC Penny, doesn't mean it was a cheap receiver. It was one of the classic "off the radar" monster receivers.
A few MCS products crossed my path over the years and they were SURPRISINGLY good. Always sold as "cheap" or off brand, but always performed as well as the name brands of that day.
Sure you couldn't brag about owning a MCS over a Marantz 2330, but it's performance was in that category.
C'mon you've gotten your $ worth after 40 years use.
Buy a fresh unit :-)
Where did he post for parts wanted.
How about a link or a list
Dan Santoni
Not knowing the parts or what I'm actually talking about -!
You're tech should have the knowledge to find a "similar" speced part. And I'm "assuming" it's a semiconductor we're talking about.
Unless it's financially not worth the cost, you have nothing to lose trying.
There are a few parts for which no currently-produced part is a good substitute. Some transistors (Yamaha's V-FETS from their wonderful B2 amp for example) and a few IC's are truly unobtainium. As other noted, the list would help.
NEC might be a good resource, assuming that they built them for JC Penny. I've found that, even in big companies, you sometimes find a dedicated parts/documentation person who is happy to go digging for documentation or rare parts.
WW
"They got a handful of gimme and a mouthful of much obliged." Alberta Hunter
Without the specific details, how can one comment?
What parts ? How about a list.
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