View Single Post
Old 12th Jul 2019, 8:08 pm   #40
Nuvistor
Dekatron
 
Nuvistor's Avatar
 
Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
Posts: 7,193
Default Re: Hacker GP42 and AL42 restoration help

Quote:
Also when the amp is powered up with no speaker connected there is a strange squealing noise coming from the amp
Probably the output transformer protesting, don’t run it without a load of some kind, speaker, low value resistor.

Change those components, they will probably be out of specification, confirm the cathode components are good, they may be in that list from Michael to replace.

I am just wary of saying get two new valves at the price they are.
__________________
Frank
Nuvistor is online now   Reply With Quote