RK II Preamp Tubes Locations

[daveythomas]

Anyone know what each of the six RK II preamp tubes are responsible for?

V1 - V2 - V3 - V4 - V5 - V6

Lets say I wanted to change the characteristics of my amp a bit by changing out the preamp tubes. Are all the tubes switched out to get a different sound or only certain positions?

 

[jackieTHEjokeman]

I was wondering the same thing. The manual that came with my Roadster doesn't talk about them. I am pretty sure this is what they are:

V1 = First Gain structure (Affects Tone)
V2 = Gain (Affects Tone)
V3 = Gain (sort of affects tone)
V4 = Standard (doesn't affect tone)
V5 = Tube driver (MPI) (pushes the power tubes)
V6 = Reverb Driver

 

[daveythomas]

ubersam was kind enough to explain them in another post, and they are a bit different than what you show.

http://forum.grailtone.com/viewtopic.php?t=5785

V1A First gain stage
V1B Second gain stage
V2A Third gain stage, Ch1 & 2
V2B Third gain stage, Ch3 & 4
V3A Fourth gain stage, CH3 & 4
V3B Tone stack driver CH3 & 4
V4A Reverb return
V4B Reverb driver
V5A Effects loop send
V5B Effects loop return
V6A&B Driver/phase inverter