laney, ask Sanjivdas........he has a lot of tubes with him and i guess hes at bangaluru too. If Im not wrong there are a couple of mods u can do on the G7, read it on their forums somewhere, changing the tube resulted in a more wider range of distortion from the machine.....ill try to find the link to how its done..
hmm Im dead sure id read it somewhere here https://www.thestompbox.net/forum/viewforum.php?f=15 try searching for it or just post it there....
yea i heard that the tubes give a better tone and this one guy used a 12Ax7 or something on it and said it played wonderful...i guess i wont touch cus mine is pretty good