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Old 20th January 2012, 10:32 AM   #1
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Default Counterpoint SA12 MOSFETS RFM10P12 RFM10N12

Trying to source mosfets to get my Counterpoint SA12 back on the go, a tall order I know, but I'm always optimistic!

Need two RFM10P12 and two RFM10N12

Anyone got some they could sell, or know of a supplier?

Thanks

Last edited by Rob Hannah; 20th January 2012 at 11:38 AM.
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Old 20th January 2012, 11:53 AM   #2
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I think your best bet is to replace those with newer mosfets which have much better specs anyway. You should replace them on both channels. It seems those mosfets are a weakpoint in that design.

Otherwise try here Alta Vista Audio Home Page
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Old 21st January 2012, 01:18 AM   #3
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Thanks, might be forced into a re-design by the look of it although I was hoping to keep it original. Can't stretch to the alta vista prices for this just now.
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Old 21st January 2012, 02:45 AM   #4
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Hi Rob

I have the higher voltage version - 150V.

RFM10P15
IRF233

NOS by Harris. The IRF233 is the same as the RFM10N15.
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Old 21st January 2012, 05:21 PM   #5
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Thanks Michael, higher voltage versions sound like a good bet, I imagine they should be pretty much a direct replacement? Have you two of each you would be willing to sell? PM me?

Would love to get the SA12 working again, sad seeing it sitting so forlorn.

Last edited by Rob Hannah; 21st January 2012 at 05:41 PM.
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Old 21st January 2012, 05:59 PM   #6
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I have only 9 pairs in stock. No problem selling 2 pairs. I'm quite certain they can replace the 120V version directly.

Price is US$16.50 each. This is my cost when I bought them in the early 90s. Mosfets were pretty expensive then.

Shipping is about US$8-10 (USPS 1st Class Air Mail) in Carton Box (8"x6"x4").

Do you happen to have the SA12 schematic? I always thought they used 2SK135 and 2SJ50 Hitachi Mosfets. I may be mistaken.
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Old 21st January 2012, 06:29 PM   #7
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I don't have the schematic I'm afraid, would certainly be useful though. I think you're right, some did use the 2SK135s and 2SJ50s, others used the ones that are in mine.

Price sounds fine to me, thanks. Message me direct with payment details please, and I'll send my address.
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Old 23rd January 2012, 06:48 PM   #8
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Quote:
Originally Posted by Rob Hannah View Post
I think you're right, some did use the 2SK135s and 2SJ50s, others used the ones that are in mine..
The SA12 used the RCA (then Harris) RFM12N10 & RFM12N10 (120V 10A TO3) and the Hitachi 2SK398 & 2SJ112 and finally the International Rectifier IRF130 & IRF9130(100V 14A/11A). All devices are vertical MOSFETs.

The Hitachi 2SK135 and 2SJ50 are lateral MOSFETS and not usable in the SA12 without modifying the design.

The NMOS and PMOS pairs must be closely matched
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Old 23rd January 2012, 10:56 PM   #9
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This thread has the schematics of the SA100 which is similar to SA12
Counerpoint SA100/200 power amp scheme

You should also check out this thread
Counterpoint SA12: What's that smell?
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Old 23rd January 2012, 11:20 PM   #10
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Quote:
Originally Posted by VivaVee View Post
RCA (then Harris) RFM12N10 & RFM12N10 (TO3)
Ahh, happy days.
Not the same numbers, better duo actually, but neither are yours. (12A,100V)
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