tube replacement help needed demeter vtbp-m-800d

[hgregs]

hi... i am in the process of trying to change my preamp tube. i incorrectly assumed both tubes were 12ax7s, and pulled them out. i now realize that one is a 12ax7 and one is a 12at7 (for the fx loop? the direct out?). anyway, can someone please tell me which side gets the X and which gets the T? there is no label or schematic that i can find.

 

[Spectre1966]

This may help.

Demeter VTBP-201s Tube Question

 

[hgregs]

This may help.

Demeter VTBP-201s Tube Question

Thanks. Definitely related and interesting, but no info on right/left sockets getting which tube.

 

[JW56789]

I'm hardly the tube guru, but let me ask: Are the socket ends (and then the chassis input sockets they plug into) the same? Maybe you got lucky and they are different and you CAN'T plug one into the other.

I depend on this sort of thing to help idiot-proof myself, a full-time, 24/7 job . . . . . .

Or call them at (805)461-4100 Monday AM, Pacific.

 

[hgregs]

they have the same sockets... BUT... i found this Tube rolling a Demeter VTBP-M-800D and the left is the X and the right is T.

problem solved. thanks.

 

[JW56789]

Great !

 

[ahc]

The 12ax7 goes in V1 which, as you look at the front of the amp, is on the LEFT. The at7 goes into V2 which is on the RIGHT. The at7 is the driver for the power amp. And yes, I've got a VTBP-M-800D and like it a lot.