I have just started my first Hybrid 5.1 surround sound amp, it has 5 6H8C preamp tubes with 6 mosfet amp modules with a AC3 & DTS digital to analogue audio converter built into the cabinet so I then can plug 6 analogue RCA out to 5 speakers 1 subwoofer. in theory it should work a treat will see in practice once finished. what do you think, work or not??😀
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Hey there,
nice Amp! I started to plan such a project myself. How did it work out for you? Are you happy with the sound? Would you be able to share some schematics?
Thanks!
Cheers,
Oliver
nice Amp! I started to plan such a project myself. How did it work out for you? Are you happy with the sound? Would you be able to share some schematics?
Thanks!
Cheers,
Oliver
Cool. I'm doing an analog project similar. Will be a matrix/quadraphonic decoder circuit from the tubecad journal, and a delay chip for the rear channels using the pt2399 delay IC. The whole thing will be wrapped up in a buffer sandwich based on Sy's heretical preamp.
I think you're going to end up needing a fan or two. Those heat sinks would work great if they were attached to an aluminum top-side but attaching them to wood like that is going to give you poor dissipation. They might be OK for low volume but crank them up and you're going to run into the over-temp protection of those ICs.
On a side note, I'm curious what you are going to think of that converter since I was thinking of using a similar one for a similar project though mine was/is going to be a 5 channel with tube output.
On a side note, I'm curious what you are going to think of that converter since I was thinking of using a similar one for a similar project though mine was/is going to be a 5 channel with tube output.
I agree - the heatsinks aren't really going to do a lot - short term, they will help (and OK for basic testing) but run much power into a load for a while and they will get far too hot for comfort.
Another point no-one else mentioned - I would strongly recommend not using brown, blue and yellow/green wiring for DC power distribution. In Europe at least those colours are reserved for mains voltage wiring. If you (or someone else) later thought they were measuring a moderate DC voltage which turned out to be live mains, there could be serious consequences.
Lastly, good wiring practice would be to feed each amplifier PCB with separate wires from the power supply rather than to wire them up as a chain. That way, the power and ground currents from one board will have much less influence on any of the others. It would also help keep prevent the input circuits being affected by ground noise cause in the same way.
But I like the idea of the project, and I hope that it is successful. I once planned a five channel mono-block (all semiconductor using 5 LM4780 amplifiers). I never built it, but I might save it for a retirement project one day.
Another point no-one else mentioned - I would strongly recommend not using brown, blue and yellow/green wiring for DC power distribution. In Europe at least those colours are reserved for mains voltage wiring. If you (or someone else) later thought they were measuring a moderate DC voltage which turned out to be live mains, there could be serious consequences.
Lastly, good wiring practice would be to feed each amplifier PCB with separate wires from the power supply rather than to wire them up as a chain. That way, the power and ground currents from one board will have much less influence on any of the others. It would also help keep prevent the input circuits being affected by ground noise cause in the same way.
But I like the idea of the project, and I hope that it is successful. I once planned a five channel mono-block (all semiconductor using 5 LM4780 amplifiers). I never built it, but I might save it for a retirement project one day.
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