My latest project - 60w per channel amp (just pics)

[audio_tony]

After languishing in my project box for about 2 years, I finally got around to building this amp, based on two modules bought off that well known auction site.

My original intention was to make these into mono blocks, and I'm still undecided about doing that. As it stands here, it's built into a Cambridge A5 chassis that I had (amp was blown).

I still have some work to do, such as fitting some snubber caps across the rectifiers, and also some additional filtering on the PSU. I also have a set of four matched caps to replace the 'prototypes' you see here.

The sound is very good, which doesn't surprise me, as I believe these amps were based on a Musical Fidelity design.

I may also look at reducing the overall gain, as it currently seems a bit high when used with a preamp. This may or may not be a good thing..

All comments (bad or good!) welcome.

[jaycee]

Looks good The problem with the Cambridge amps can be seen easily - that heatsink is rubbish and the Sanken SAP transistors used in the circuit blow up due to overheating.

I'd neaten up the power wiring a bit. The best thing to do is to twist together the +V, -V and GND wires and run them back to the psu. This keeps interference down. I'd use some screened cable for your signal inputs too.

[Tekko]

Yes those heatsinks made from a thin aluminum plate and folded aluminum/steel sheet are the worst heatsinks you can find!! I HATE HATE HATE them!!

[audio_tony]

Yes I had planned to tidy up the wiring. I used some quite thick 42 strand cable, and it's quite unmanageable really. I need to use something thinner I think.

And those heatsinks... yes, I know they are rubbish, and again I am looking to replace them. As I'm still undecided about whether or not to make this into monoblocks, I haven't yet decided which heatsinks to go for.