STK032 analog

25W per channel.
Check power supply voltage, and use two similar mono chip amps, or a Mosfet amp kit.
1875 (!), 3886, 7293, whatever suits.

You will need to do some work, the mounting holes, and wiring will be needed.
But really good and reliable result.
 
I have a UCD102 board.
Can I adapt this board on this Amplifier?
3_ucd102-oem.jpg
 
+/- 30 is 60...this Hypex board is good to 36, max. 42.

1875 is good to 64,
3886 to 68V.
7294 max, is 100 V,
7293 good to 120 V, de rate all to 80%.
So 7293 and 7294 are practical, or use a Mosfet kit sold in India or on line from China.
Those are easier to get today than chip amps...

Your power supply and so on are safe?
Sometimes STK failure takes out power supply and speakers also.
 
AliExpress for some reason is blocked in India.

I would need a circuit diagram, but it would involve changing a lot of parts to change from 30 to 22 V.
Here a Mosfet circuit, fully populated, using a 30-0-30V 8A supply was all of $8.
So that is a quick easy solution.

You can always check if there are Hypex boards suitable for your supply.

Samples:

https://www.salconelectronics.com/product/4-mosfet-power-stereo/

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjQjM6rlub2AhU2SmwGHe-_ANcQFnoECAQQAQ&url=https://www.amazon.in/MOSFET-Amplifier-Board-30-0-30-Ampere/dp/B07ZRC86SJ&usg=AOvVaw1zf-xSM5AloIlrqJAxjj3Y

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjQjM6rlub2AhU2SmwGHe-_ANcQFnoECBMQAQ&url=https://www.desertcart.in/products/180884095-500-w-mosfet-mono-amplifier-board-irfp-240-9240-240-w-rms-30-0-30-v-dc-8-ampere-amplifier-kit&usg=AOvVaw04fbYMGPWl6ymieEtDzLl7

The lower two are out of stock!
But enough information for you to be able to obtain it from any supplier of your choice.
 
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Hypex normal volts is 36, so +/- 18. You would need a new transformer, big and expensive job.

Stick to putting a new power amp PCB from a known supplier.
These Indian people are reputed, I have no idea of the Chinese suppliers, never having dealt with them, so I cannot tell who is good or bad.
Ask around, wait, somebody here should be able to help.