1995 Ampeg V-4B Classic Series Bass Head Tubes?
Got this for a very now price. Seems to have almost all the original Sovtek tubes (has one JJ EC-83). I would like to re-tube, but have a questions.
There is not much info about this version out there. Ampeg posts a manual from the 1999 version which seems about the same with only slight cosmetic differences (mine has the red "V" that looks like a check mark, versus the block letters "V4BH" in the later version". The newer versions say there is one 12AU7 tube in the Drive circuit (along with a 12AX7), and in the 1999 manual Ampeg lists 2 12AU7's in the drive section.
So, when I took out these tubes there were two 12AX7's that were easy to remove from underneath the amp, and there were 2 more 12AX7's inside the amp housing (had to pull the amp from the case). Two questions - which are the drive tubes (the internally or externally accessible tubes), and should I put in one that is a 12AU7 in the drive circuit?