I have two NOS 12AX7s -- which slots should I use them in?

[SBG200]

Just looking for advice/insight about the different preamp tube positions here. The tubes are GE long plates. I'm guessing V1 is probably a no brainer. Which position do you think would be the best for the other NOS? I'm guessing it'd probably be b/t V2 and V7? Thoughts?

Thanks.

 

[SteveO]

IIRC, V2 is the second gain stage for channel two only. I have a Sylvania long plate 12ax7 in V1, that made a noticeable difference overall, and an RCA 12at7 in V2 that made the lower-gain region of channel two more useable. V1 is the obvious one, but experimenting is the best bet.

 

[eudaimonia02912]

V1 has the most global effect. Changing V7 in my experience tends to change the feel more than the overall sound, though I have found some tubes make the sound thinner and others make it thicker. V2 has a serious effect on channel 2, but no effect on anything else. V3 matters, too.

Look at the back of the manual to see what the different tubes do.