glenn jarrett
pfm Member
Thanks again Arkless
set up 2 meters on mv and measure the voltage across the emitter resistors on both channels
with amp just powered no speakers or input connected
the first measurements before adjustment was 7 .0 mV left and 2.2mV right the heatsink luke warm
after adjusting both pots up to 140mA as soon as you set it it starts to drop counting down as the heatsink temp rises
after some time it settles to 63mV and 62mV with a heatsink temp of 56 oC
Big thanks to Arkless and Pete MB&D for the help in getting this up and running
been running for about 10 hours now
sounds very good indeed on my stunt speakers
already blows my NCC220 out of the water
I think my next diy build will be a class A
any recommendations ?
I think it was more stupidity than guts... looks like the soldering was done with a hot screwdriver on a hob and plumbers solder, I taught my teenage daughter to solder and she was (much) better than this on her first go, having the right tools and materials probably helped.The foil must have made it sound 'tinny' so hence the gaffer tape to 'man-up' the sound a bit....
Amazed someone with obviously no knowledge and even worse soldering skills than myself would have the guts to start wiring up mains stuff like this....
...and how come the previous tech didn't rip this apart? (Presuming he wasn't the gaffer tape guy).
Copper round transformers though...now that quite an 'in' look at the moment.
Having a look around for bare boards loads on ebay but are they any good?
the diy audio stuff looks very good and plenty of advise on the site but the import duty makes it expensive cost me £35 just for the Mezmerizer pcb
i think 25W will be plenty
i have a modushop dissipante case the 3u one but not sure if it will give enough cooling for 25W
as for the fets i have 16 x J74 and 6 x 2sk170b Toshiba's so maybe do a few swops on here to get the 2x pairs i will need