Precence control squeal
Moderator: VelvetGeorge
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Mars Hall
- Senior Member
- Posts: 955
- Joined: Mon Dec 17, 2007 9:49 pm
- Just the numbers in order: 7
- Location: The Region, NW Indiana
Precence control squeal
Howdy, I have a Marshall 50 watt reissue head that was upgraded with a Metro PTP tag board. The amp has been setting for awhile unused, when I fired it up recently the presence knob presents with a high pitch squeal at about 8 on the dial. Am I looking for a micro-phonic tube?
"You just slide a bottle up and down til what you want out of it comes out. You just slide away at it til you've got it down." Duane Allman
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neikeel
- Senior Member
- Posts: 7231
- Joined: Tue Dec 06, 2005 8:31 am
- Location: Suffolk, England
Re: Precence control squeal
Sounds like PO.
Check the lead dress - that will fix 90% of those problems, if that does not work try 5k6 or 4k7 grid stoppers between the orange and green wires and pin 5 of the output tube sockets
Check the lead dress - that will fix 90% of those problems, if that does not work try 5k6 or 4k7 grid stoppers between the orange and green wires and pin 5 of the output tube sockets
Neil