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Old 10th July 2014, 04:13 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, 04:14 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 13th October 2014, 12:26 AM   #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; 13th October 2014 at 12:28 AM.
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Old 13th October 2014, 01:11 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, 03:17 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, 03:12 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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