TA-200W replacement (Kenwood KR-9600) - diyAudio
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Old 4th March 2012, 02:34 AM   #1
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Default TA-200W replacement (Kenwood KR-9600)

I finally got around to fixing a friend's Kenwood - I haven't done a power amp project since college (guess how many years ago !). It turned out ok. I'll be glad to supply details if anyone else needs one of these.
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Old 4th March 2012, 04:13 AM   #2
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Very clever!
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Old 4th March 2012, 11:18 AM   #3
latala is offline latala  United Kingdom
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yes lets have the details and schematic
regards Trev
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Old 6th March 2012, 02:28 AM   #4
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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.
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File Type: gif KR-9600-PA.gif (157.7 KB, 388 views)
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Old 6th March 2012, 12:12 PM   #5
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Here's a (maybe) better Kenwood schematic.
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Old 1st June 2012, 08:23 PM   #6
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What do pins 4 and 7 do in the original chip?

Is your circuit based on what was originally in the 200W chip?
Or did you design this from scratch?

Thank you
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Old 30th November 2012, 09:10 PM   #7
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Quote:
Originally Posted by alhaynes View Post
Here's a (maybe) better Kenwood schematic.
Hi alhaynes, your TA-200W replacement looks interesting. I am working on one I just bought which does not yet have bad outputs but it's good to know you have a cure.

There is no DC zero adjustment on the original power amp and my unit is running 150mV on L and 160mV on R. I'm thinking that is a little too high. Do you have any thoughts on curing that, and what were you able to achieve on your circuit?

Thanks
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Old 3rd September 2013, 08:36 PM   #8
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Al, what are the transistors and diodes that show in your schematic that are external to the STD transistors?
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Old 8th September 2013, 01:21 PM   #9
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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 25th June 2014, 02:34 AM   #10
vintess is offline vintess  United States
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Default Did anyone hear back from alhaynes...?

Wondering if anyone heard back a reply to their inquiries/posts from alhaynes??? I know that this is an old thread, but I would venture to say to there are a few KR9600's out there. Like anything electronic, they aren't going to last forever! And, judging from what I have heard, those power paks do take a licking during startups...

I have a Kenwood KR9600 (original owner) that I am currently using as a main amp (bypassing the pre section) in my main hifi system. I am close to finishing up a Nelson Pass clone F5 Turbo DIY project that will replace the Kenwood, at least temporarily.

The aging Kenwood needs some phono amp section work. I plan on going in and tinkering to see what is possibly wrong (no output on one channel when using phono section; all other preamp sections work great). I figure since I have it apart, I might as well rebuild it with modern caps/resistors, etc. I would especially be interested in a BOM for the replacement/rebuild.

It would be great to have further insight into the Darlington power paks which, as I understand it, are no longer available.

Any guidance from more experienced Darlington array/Kenwood gurus would be greatly appreciated.

Last edited by vintess; 25th June 2014 at 02:35 AM. Reason: typos/clarification
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