20-07-2020, 08:10 PM
R E S O L V E D!!!!!!
It was C2 that was the offending CULPRIT.
I replaced the original with a new JB audio 16uF 450V 105degree electrolytic. When Trevor suggested investigating C2 I thought it couldnt be, being a new cap. I measure the ESR at 1.7R and the old one at 0.38 so decided to put the old one back. Now there is a minute amount of mains hum which I would expect to a guitar valve amp. When I put a lead in instant hum and buzzing when I put my fingers across the jack plug - when the lead was removed back to minute mains hum.
Looks like its done.
Thank you all so much indeed.
Best Regards
A very grateful Rob.
It was C2 that was the offending CULPRIT.
I replaced the original with a new JB audio 16uF 450V 105degree electrolytic. When Trevor suggested investigating C2 I thought it couldnt be, being a new cap. I measure the ESR at 1.7R and the old one at 0.38 so decided to put the old one back. Now there is a minute amount of mains hum which I would expect to a guitar valve amp. When I put a lead in instant hum and buzzing when I put my fingers across the jack plug - when the lead was removed back to minute mains hum.
Looks like its done.
Thank you all so much indeed.
Best Regards
A very grateful Rob.
if all else fails...read the instructions!
