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TA-200W replacement (Kenwood KR-9600)
TA-200W replacement (Kenwood KR-9600)
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Old 2nd July 2017, 08:34 AM   #21
Welcome is offline Welcome  France
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It cannot be obtained anywhere except taken from a functioning amp. You're out of luck.
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Old 17th September 2017, 11:18 PM   #22
rafasa36 is offline rafasa36
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Quote:
Originally Posted by jimratzlaff View Post
Does anybody know where the Kenwood power amp (TA-200W) can still be obtained? I have one in for repair, and the shop owner says he can't find any at all.
Thanks.
Hi! i made the output circuit with the diagram showed in the post, it works great, if need help, just ask.
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Old 28th October 2017, 12:31 PM   #23
Sugarun is offline Sugarun
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Default A few Trio TA-200W ...

Contact member mattsd, he @ Matts Audio Repair 513-900-8275. He @ Audio Paradise in Blanchester, Ohio. See more info on Facebook!
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Old 13th January 2018, 06:52 PM   #24
Henken Swensen is offline Henken Swensen
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From the KR-9600 manual, a schematic of the power pack without specifics. Years ago I recall seeing hybrid schematics for STK and other units but I can't recall any Kenwood or Yamaha specific drawings.
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File Type: jpg TA-200W power pack schematic.jpg (68.2 KB, 91 views)
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Old 8th March 2018, 04:27 PM   #25
rafasa36 is offline rafasa36
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Default Solution TA-200W

I take post from "alhaynes" member of DiyAudio, i made it and works great
i use the darlington cople of transistors: STD03P and STD03N, is easy to made, feel free to ask.
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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Old 8th March 2018, 06:09 PM   #26
rsavas is offline rsavas  Canada
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It would be nice to make a pcb.
I made a replacement STK-0050 module for the folks at the AK Pioneer forum. They are using them in the SX-780 and some Fisher models.
We have saved a few from the landfill :-)
I simulated the design in ltspice.
One member has made up the Al plate to mount the pcb on, it attaches to the existing heatsink. The plates are being sold on eBay and I have made the BOM available at Mouser.
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Old 8th March 2018, 07:16 PM   #27
tiefbassuebertr is offline tiefbassuebertr  Germany
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Quote:
Originally Posted by 1995fxdwg View Post
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
check out post #11 under
Thick Film Hybrid (not monolithic) Integrated Circuit Amplifier - Overview
Quote:
Originally Posted by rafasa36 View Post
I take post from "alhaynes" member of DiyAudio, i made it and works great
i use the darlington cople of transistors: STD03P and STD03N, is easy to made, feel free to ask.
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.
check out post #5 under
Wide range of unreliable Amp Models with SANKEN's SAP/STD Series - Why ?

Last edited by tiefbassuebertr; 8th March 2018 at 07:23 PM.
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