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Old 9th March 2015, 04:15 PM   #1
tiomilo is offline tiomilo  Costa Rica
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Default advice needed to replace old STK

hi people greetings from distance, have this old receiver with STK460 amplifier but isn't working good, one channel sounds distorted, want to replace entire amp section with TA2022 ( very cheap and easy to build ) class T chip amp and 90W X 2 compared to 30W original STK460, analyzing power supply and fits perfect to TA2022 specks. 25v 1500 ma per rail. need opinions about it before start.
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Old 9th March 2015, 04:30 PM   #2
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25V and 1500 ma will not give enough power.
You should change the powersupply too.
To something with higher VA rating.
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Old 9th March 2015, 04:39 PM   #3
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Math tells us that what you claim is impossible.

50 x 1.5 = ?

Case closed.
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Old 9th March 2015, 04:41 PM   #4
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Plus I would never put a digital amplifier into an old receiver. A 3886 will work with your power supply, and deliver similar power from the power supply.
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Old 9th March 2015, 04:43 PM   #5
tiomilo is offline tiomilo  Costa Rica
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In this case should be 50X3 is 25v 1500ma per rail. So 50v 3000 ma total. Measures was made with dummy resistor those are average results.
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Old 9th March 2015, 04:50 PM   #6
tiomilo is offline tiomilo  Costa Rica
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LM3886 ?? sounds good too, was thinking on TA2202 because is cheap and easy.
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Old 9th March 2015, 05:46 PM   #7
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Check out chipamp.com. You can buy kits and fully assembled boards.

You won't get full rated power of a 3886 if you use your power supply. Power will be similar to the original specification.
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Old 10th March 2015, 12:26 PM   #8
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Ideal replacements include STK459, STK460, STK461, STK463 which will keep your receiver's features intact, much unlike what will happen if you replace with a much different chip.

I say this because, usually the tone controls wrap around the power amp. However, If your tone controls are on a separate preamp board (or section), then many different amplifiers could be used.

Except these: LM3875, LM3876, LM3886, LM4780 and other overture chips contain the spike system limiter, which protects the chip at the cost of exacerbated clipping-like noise. . . which is exactly what you'd get if you run the voltage too low. Of the overture series, LM1876 is for that voltage, but that chip is very low power and has the spike system to make sure you won't enjoy the results at full blast.

Your TA2022 (and other digital amplifiers) could work, except that fm radio reception probably won't work after that, or would at least be a shorter range, plus some noise. So, for a receiver, you'd want a Class AB amplifier.

LM1875's could work, except that 4 ohm speakers might blow them up on that voltage. However, if you got 8 ohm speakers, then those could work. My TurboII schematic has LM1875 at that voltage.

TDA2050 can also do it.

TDA7293/4/5/6 can all work easily at that voltage.

On this list, the least likely to be fake is a Singapore TDA7295.
At that voltage, it can easily drive 4 ohm speaker to 45W, with 80W peak power available.
So can STK463, which is a lot easier to install.
And STK bass is better than the little chips (epic difference in output transistor size).
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Old 10th March 2015, 12:48 PM   #9
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I would replace the IC.
stk460 | eBay
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Old 10th March 2015, 02:34 PM   #10
tiomilo is offline tiomilo  Costa Rica
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Thanks for the advice. The STK module i want to replace for whatever chip amplifier basically is for the reason i can't get original ones. Bought 2 on eBay and one at digikey all of it was Chinese clones. Very poor sound quality and weird noises, not present on original came with the receiver, only have one bad channel. Maybe would be better fit a full transistor amplifier circuit besides chip amp.
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