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Replacing the STK461 in the AKAI AM-U11 amplifier.
Replacing the STK461 in the AKAI AM-U11 amplifier.
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Old 10th June 2019, 07:36 AM   #1
Dmitry Ukraine is offline Dmitry Ukraine  Ukraine
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Default Replacing the STK461 in the AKAI AM-U11 amplifier.

Hello.
My name is Dmitry, I live in Ukraine.
I like your forum, a lot of interesting and informative.
I have an AKAI AM-U11 amplifier in repair in which the STK461 chip burned.
Tell the circuit amplifier transistor or microcircuit as a replacement for STK461.
Power supply in the amplifier + - 26 volts.
With best regards, Dmitry.
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Old 10th June 2019, 07:42 AM   #2
ubergeeknz is offline ubergeeknz  New Zealand
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You could always wire in a suitable TDA chipamp, they are readily available. If so I'd replace both channels (and sell the good STK chip at a nice profit!)
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Old 10th June 2019, 09:02 AM   #3
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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The STK is a stereo chip.
I was an Akai service centre back in 1998 and they were obsolete then.
Do not be tempted to use Fleabay for a purchase as they will be non genuine.
There is a + and - 30volt supply available which would fit a pair of TDA7293 chips.

I have had good results from this seller; 100W High Power TDA7293 Digital Audio Amplifier AMP Board Mono Single Chan YJ | eBay
And they are straight forward to wire in.
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Old 10th June 2019, 10:15 AM   #4
huggygood is offline huggygood  France
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+1
my first amp diy in 20th century was with tda 7293/94, they are very good chips
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Old 10th June 2019, 02:38 PM   #5
Dmitry Ukraine is offline Dmitry Ukraine  Ukraine
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Thank you for your attention to my problem and answers.
If you use 2xTDA7293 I do not have enough power transformer power.
STK461 is 2x20 watts, hence the power transformer of the amplifier (with a margin) will be 60 watts.
The LM and TDA microcircuits have maximum power + - 22 Volts, which is also not very suitable.
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Old 10th June 2019, 03:02 PM   #6
anti is offline anti  Slovakia
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Maybe LM4766?

http://www.ti.com/lit/gpn/lm4766
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Old 10th June 2019, 03:13 PM   #7
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Quote:
Originally Posted by Dmitry Ukraine View Post
Thank you for your attention to my problem and answers.
If you use 2xTDA7293 I do not have enough power transformer power.
STK461 is 2x20 watts, hence the power transformer of the amplifier (with a margin) will be 60 watts.
The LM and TDA microcircuits have maximum power + - 22 Volts, which is also not very suitable.
Just because you have a power device good for 80Watts, if run at full voltage, doesn't mean you must use full power.
With the supply voltage you have, it will self regulate and give a useful volume, power wise.
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Old 10th June 2019, 03:36 PM   #8
huggygood is offline huggygood  France
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Quote:
Originally Posted by Dmitry Ukraine View Post
Thank you for your attention to my problem and answers.
If you use 2xTDA7293 I do not have enough power transformer power.
STK461 is 2x20 watts, hence the power transformer of the amplifier (with a margin) will be 60 watts.
The LM and TDA microcircuits have maximum power + - 22 Volts, which is also not very suitable.
do not trust this data sheet, I mounted the 7293 and 7294 often has more than 35vd without problem.
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Old 10th June 2019, 05:22 PM   #9
rsavas is offline rsavas  Canada
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LM3886 gain clone is a good possibility.
Tom might be able to help you, look in the chip amp section.
Neurochrome Audio: High performance DIY audio circuits.
It does come down to the ability to fit such circuits into the exist space.

Last edited by rsavas; 10th June 2019 at 05:28 PM.
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Old 10th June 2019, 06:06 PM   #10
huggygood is offline huggygood  France
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I think that considering the price of am u-11, it might be wise to look for one on the second hand market.
here, it sells between 20 and 50 €.
over 20 years, I had to put a good ten to the trash and I never thought to recover the stk, it's really stupid of me.
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