The most common cause of this problem is discussed here: http://music-electronics-forum.com/t28549/
Hi i have a Randal RH150 head and randomly the output cuts in and out this happans on all channels. The only thing that rectifies it is i have to plug my highest output guitar in and strum it really hard (dimebucker pickups). This amp is called "valve dynamic" uses mosfet power and has a single ECC81 valve in it which i have replaced but hasnt fixed the issue. any insight would be appreciated.
"Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey
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