Anyone repurposed an old amp and added Class D Modules?

mortron

Member
2011-08-20 6:02 am
Town
Ive got a pair of amps with bad amplifier sections and am wondering if rather than throwing them out, giving them new life by reusing the enclosure, power supply section and heatsink by adding some class D modules.

As I understand the schematic, there is a 15v supply coming into the amplifier section. I am planning to try to isolate the power supply section from the rest of the components and remove them making room, and am curious what chips may lend well to my scenario? Ive got a nice TPA3116 and would like to find something more powerful.

I know some have dabbled extensively in Class D, and have seen some promising pieces at very low prices, but am doubful that should be my primary deciding factor. I look forward to your suggestions, thanks in advance.
 
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mortron

Member
2011-08-20 6:02 am
Town
Fair enough assumption. I cannot wrap my head around this schematic.

Service manual is in here.

Onkyo TX-8050 Manual - Network Stereo Receiver - HiFi Engine

When turned on, speaker protect trips and shuts off instantly. As I understand it, there are issues with the amplifier that resulted in most of them failing and cannot really diagnose and repair that kind of problem easily. so am hoping I can repurpose the power supply along with the heat sinks and enclosure to make a new amp to use in my active biamp rig. The cases are in great shape and can make something nice I think. Beats a 3116 on a slab of MDF :p
 
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scholl

Member
2012-12-30 5:07 pm
I used an old Dynaco ST150 that never worked right. Bumped up the power supply to 33000uf caps and drive a ClassDaudio module.

Also a rust bucket beat to crap AB international 900 with 20000uf caps to power a cheapo set of 2092 modules.

If you can get the chassis cheap it's a great way to go. Otherwise just buy and Carvin HD3000 and be done.