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Tube Swap Question

GuitarGuy3

Member
Messages
853
Can you swap out 12AX7B tubes for 12AX7A tubes without biasing the amp? I know nothing about the tech side of amps.
 

GuitarGuy3

Member
Messages
853
Thanks! I have a newer Bogner Shiva 20th that is dropping in volume when it gets bumped. When I hit it again with my hand the volume comes back. My first thought is preamp tube issue but I really have no idea?
 

HotBluePlates

Member
Messages
10,044
... dropping in volume when it gets bumped. When I hit it again with my hand the volume comes back. ...
Something has a poor connection, and is working/not-working when bumped.

It could literally be any connection in the amp. A thorough visual inspection inside & out, and maybe poking with an insulated tool will probably turn up where the bum connection is.
 
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