Fender bassman tube question

martyhk0

Member
Messages
161
I have a fender bassman reissue. I have a few semi noob questions. It has a ss 5ar4, 2 6l6, 3 12ax7.
theres no problem swapping a tube 5ar4/gz34 for the ss one right? What about a different rectifier tube, like a 5r4 or a 5u4??
what about swapping in some 12ay7? how would that change the sound? what positions would you put a 12ay7 in?
Thanks
 

billyguitar

Member
Messages
6,071
The 12AY7 in at least V1 will give you a smoother nicer tone. It will still distort plenty when it's cranked.
 

rockindillo

Member
Messages
320
I've got a 12AU7 in the first hole on my (harp amp) Bassman. This is common practice for harp players using super-high impedence bullet mics, as a way of lowering the gain and giving the volume control a bit more "range". (Otherwise, it's more like an on-off switch than a volume control.)
 

Blue Strat

Member
Messages
30,723
Yeah, AU7s are very common for harp players and not a problem in amps that are probably already too loud (harp players with 12AX7s in all sockets of a Bassman don't have many friends;)).

A 12AU7 in a guitar amp first stage typically drops the volume too much. They tend to do better in overdrive channels that have over the top distortion that needs to be reined in.
 




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