Location: Liverpool
Posts: 14
I'm Paul.
Oh no, feeling really gutted for you. I know how much work you have put into these Amps. No worries I'm sure it's only a minor setback.
Location: Liverpool
Posts: 766
I'm Sandro.
Well I got it apart already and the negative board has 2 blown Mosfets
I have already matched a god pair out of my stash
It looks like the J fet is gone as well but again I got plenty of spares, this is a bit more upsetting because it is going to be one less pair that I leave to my grand children's
It should be back on later on
Positive thing about it the speaker protection works
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Location: Liverpool
Posts: 766
I'm Sandro.
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Back on after changing the power dudas
Found cause of blow up as well, little strand of wire on the pot I was using to set the volumes went the wrong way
Any way
It has been cooking overnight
Offset is on the mV mark and the temperature on the sinks at a conservative 35 C
I have set the bias at 0.35 V on the resistors
Here is the output at 1Khz ~
I am using 4 30W 1R in series and they do get hot
Looking good.
Kuzma Stabi/S 12", (LP12-bastard) DC motor and optical tacho psu, Benz LP, Paradise (phonostage). MB-Pro, Brooklyn dac and psu, Bruno Putzeys balanced pre, mod86p dual mono amps, Yamaha NS1000m
Location: Liverpool
Posts: 14
I'm Paul.
looking good, sounding amazing went round for a visit today, one of the mono amp needs a little more setting up but the sound is totally awesome.
Location: Liverpool
Posts: 766
I'm Sandro.
Quite a few things to do bit of hum whit the XP10 at max
Earth lift or not to earth lift
Location: North Island New Zealand
Posts: 1,757
I'm Chris.
Location: Liverpool
Posts: 766
I'm Sandro.
There is a 40 mm wide and 3 mm thick plate connecting the capacitors and all the grounds I will get same SY 2.5 CSA cable for the supply cables
Just ned to look at the earth lift and maybe a DC suppressor, 4 big caps and diode bridge.
When I say loads of hum this is compared whit my F5s' ear close to the speakers and the XP10 at max can't hear a thing from a meter away
Finishing the enclosures will also help
Just a few holes to drill for those
No much else to report apart that they have been on for a couple of days at idle to do same burn in and form the capacitors
They should be in the new home in the next few days
I will post pictures before they go
And then I can start on the other set
Location: Liverpool
Posts: 766
I'm Sandro.