View Single Post
Old 21st Oct 2020, 10:51 am   #11
Welsh Anorak
Dekatron
 
Welsh Anorak's Avatar
 
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,884
Default Re: Ferrograph Quiet Crackly Audio

As the crackling is evident with the volume at zero, I'd be inclined to suspect an output stage fault. As David says, check the HT is constant at around 300v. Then maybe check the output valve by substitution. I assume you've replaced the coupling capacitor?
__________________
Glyn
www.gdelectronics.wales
Welsh Anorak is offline