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Techs. Opinions on interchange parts

69.164.229.112
Posted on January 6, 2021 at 04:31:47
getahobby
Audiophile

Posts: 8
Location: PA
Joined: August 5, 2013
 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

 

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RE: Techs. Opinions on interchange parts, posted on January 6, 2021 at 07:13:49
JURB
Audiophile

Posts: 2056
Location: North Ohio
Joined: May 29, 2016
 What parts ? How about a list.

 

RE: Techs. Opinions on interchange parts, posted on January 6, 2021 at 07:13:50
Kal Rubinson
Reviewer

Posts: 12436
Location: New York
Joined: June 5, 2002
 Without the specific details, how can one comment?

 

It's possible, posted on January 6, 2021 at 09:23:44
Bill Way
Audiophile

Posts: 1884
Location: Toms River NJ
Joined: May 28, 2012
Contributor
  Since: December 14, 2012
 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
"Put on your high heeled sneakers. Baby, we''re goin'' out tonight.

 

RE: Techs. Opinions on interchange parts, posted on January 6, 2021 at 11:30:45
airtime
Audiophile

Posts: 11287
Location: Arizona
Joined: February 4, 2003
 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.

 

RE: Techs. Opinions on interchange parts, posted on January 6, 2021 at 13:19:53
Blackdog
Manufacturer

Posts: 1505
Location: Ontario
Joined: March 20, 2006
 Where did he post for parts wanted.
How about a link or a list


Dan Santoni

 

JC penny Receiver??, posted on January 6, 2021 at 19:34:51
bare
Audiophile

Posts: 1879
Joined: April 14, 2009
 C'mon you've gotten your $ worth after 40 years use.
Buy a fresh unit :-)

 

MCS 3125 was one of the "monster" receivers and a hidden classic, posted on January 7, 2021 at 06:29:51
airtime
Audiophile

Posts: 11287
Location: Arizona
Joined: February 4, 2003
 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.

 

I love it..., posted on January 7, 2021 at 08:27:30
mlsstl
Audiophile

Posts: 1079
Location: Midwest
Joined: September 1, 2015
 ...when someone asks for help and then disappears from the discussion.

 

If we are talking about NTE replacement transistors rather than the OEMs, posted on January 7, 2021 at 12:57:57
Ralph
Manufacturer

Posts: 4774
Location: Minnesota
Joined: April 24, 2002
 For a receiver like this its no worries whatsoever.

 

RE: Techs. Opinions on interchange parts, posted on January 7, 2021 at 14:46:56
AbeCollins
Audiophile

Posts: 46295
Location: USA
Joined: June 22, 2001
Contributor
  Since: February 2, 2002
 As others have mentioned, unless you list the parts there is no way to provide an informed answer.



 

RE: Techs. Opinions on interchange parts, posted on January 7, 2021 at 19:31:35
getahobby
Audiophile

Posts: 8
Location: PA
Joined: August 5, 2013
 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

 

RE: Techs. Opinions on interchange parts, posted on January 10, 2021 at 12:42:19
pictureguy
Audiophile

Posts: 22597
Location: SoCal
Joined: October 19, 2008
 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

 

ON Semicunductor website...., posted on January 11, 2021 at 08:18:45
Cougar
Audiophile

Posts: 4589
Location: SoCal
Joined: June 25, 2001
 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.

 

RE: Techs. Opinions on interchange parts, posted on January 11, 2021 at 10:33:32
Hornlover
Manufacturer

Posts: 2529
Joined: March 8, 2002
 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


 

RE: Techs. Opinions on interchange parts, posted on January 11, 2021 at 20:43:52
getahobby
Audiophile

Posts: 8
Location: PA
Joined: August 5, 2013
 Finally got part numbers. He says some of these are available and some not.
2sa733
2sb706
2sd746
2sd381
2sb536
2sc941
2sa916
220 80v cap

 

RE: Techs. Opinions on interchange parts, posted on January 12, 2021 at 00:37:36
JURB
Audiophile

Posts: 2056
Location: North Ohio
Joined: May 29, 2016
 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.

 

RE: Techs. Opinions on interchange parts, posted on January 13, 2021 at 00:05:07
JURB
Audiophile

Posts: 2056
Location: North Ohio
Joined: May 29, 2016
 None of them are a problem except one with an unusually high Vce rating.

 

RE: Techs. Opinions on interchange parts, posted on January 13, 2021 at 06:20:43
getahobby
Audiophile

Posts: 8
Location: PA
Joined: August 5, 2013
 Ok. Can I buy them from you? Which is the problem part and is there a sub for it?
Thanks

 

MCS ad from 1981, posted on January 14, 2021 at 17:12:58
BS64
Audiophile

Posts: 2451
Joined: July 17, 2000



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!

 

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