TA-200W replacement (Kenwood KR-9600) - Page 2 - diyAudio
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Old 10th July 2014, 03:13 PM   #11
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Hi Alhaynes its very intresting your scematic of TA-200W can you please give me a component list what the components are?
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Old 10th July 2014, 03:14 PM   #12
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Default Kenwood KR-9600 TA-200W

Hi Alhaynes its very intresting your scematic of TA-200W can you please give me a component list what the components are?
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Old 12th October 2014, 11:26 PM   #13
srinath is offline srinath  United States
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Quote:
Originally Posted by alhaynes View Post
Here's the schematic - very simple. Outputs are darlingtons, the bias diodes are included in the package. Rbias could be 200 ohm trimpot, typically ends up in 10-30 ohm range. The outputs are mounted on the back of the board against the heatsink. The 330pf caps probably compensate for the airwiring. And I know the circuit is a little over-protected.
Prototype 1 used the SAP15 transistors which include the emitter resistors - but the SAPs are out of production. Prototype 2 used parallel pairs of STDs, but stability, or rather docility, was an issue - probably due to wiring.
Funny, it's been 40 years since I've done any power amp work (other than repairs) and very little has changed.
Even funnier, the pad that I used to jot down the rough schematic is the same one I used in college - 40 years ago !
I've included a schematic of the KR-9600 output board, but it's a bit hazy. Anyway, pins 1 & 10 are power, pins 3 & 8 are drive, 5 is output, 6 is ground.

STD03N and STD03P you used - and you have the diode and cap circled along with the transistor. Is that cos its included in the transistor already ?

And why is the circuit board on the heat sink and not the transistor ? Is that just for fit ?

Thanks.
Srinath.

Last edited by srinath; 12th October 2014 at 11:28 PM.
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Old 13th October 2014, 12:11 AM   #14
srinath is offline srinath  United States
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Never mind, the transistors are behind that circuit board.
Thanks.
Srinath.
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Old 22nd October 2014, 02:17 AM   #15
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I've seen these devices used before. Two output devices leave precious little room for oddball phase angles. I'd not consider this a very 'robust' modification, though it will bring the unit back to life (at least until a difficult speaker is connected, or someone gets too frisky with the volume control).
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Old 22nd October 2014, 02:12 PM   #16
srinath is offline srinath  United States
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He he, OK there goes another of my "bright ideas".
Thanks.
Srinath.
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Old 4th December 2015, 03:47 PM   #17
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if only someone could come up with the original design spec dang it! its been like 40 years i doubt kenwood has them even
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Old 5th December 2015, 11:47 PM   #18
vintess is offline vintess  United States
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I would almost bet the family farm that Kenwood in Japan has the original specs and additional info on their original power packs. The problem is that one would have to be able to speak Japanese in order to email that request and read the responses. I would think that they would want these vintage units from HiFi's golden age to continue to survive and thrive.

Of course, there is always the slim possibility that there are some techs out there that used to work for Kenwood that could provide us with some guidance. I know that in the late 70's one of my KR9600 power packs failed and I took it to Kenwood's suburban Los Angeles service center. They replaced the pack, serviced the unit, spec'd it out--all at no charge! How is that for old-fashion service! Not very many companies out there today that will provide customer service like that, nowadays.

On the other end of this customer service spectrum, I requested a good service facility for a Theta Digital DAC from the company's headquarters in Los Angeles recently and they DID NOT EVEN RESPOND BACK! Am I ever going to buy any Theta Digital products in the future? I think NOT!

Last edited by vintess; 5th December 2015 at 11:49 PM. Reason: Typos/Clarification
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Old 5th December 2015, 11:50 PM   #19
srinath is offline srinath  United States
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We are in a use and throw and most importantly buy more culture.
They don't even care, we are the sheeple. You wont buy a theta, you may buy a parasound. The ones disappointed in parasound are Theta's next round of customers.
We need to buy nothing, and fish em out of scrap piles and repair and use ...

The greenest car isn't one you already own, its one you have pulled out of the junkyard.

Cool.
Srinath.
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