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Old 18th Apr 2012, 1:53 pm   #40
Whaam68
Hexode
 
Join Date: Feb 2007
Location: Luton, Bedfordshire, UK.
Posts: 454
Default Re: JLH Class 'A' Amplifier

Yes I know what you mean Trev...

Well I finished the JLH apart from making the lid.....fired it up & no beginners luck I'm afraid! I had one channel only getting warm ....after a bit of probing I managed to get this down to no chnnels getting warm I think the problem probably lies with my off board mounting of the transistors..as the power supply is putting out 33v I'm away for a few days now but will get back on it next week ...re check all my soldering & drill out the mounting holes on the heatsinks a bit more...I have a feeling I may also have toasted a couple of the transistors as I heard a muted double crack on powerup like a static spit....ordered some spares...good job they are only 79p each!!

If anyone has any thoughts on simple JLH diagnostics let me know!

regards

Mike
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