tube works 910 tube driver tube swap

[REGNAD]

i have a pair of Matsushita 12ax7 tubes i may try in this pedal. has anyone tried these tubes in this tube driver? im looking for more versatility, when adjusting the gain i go from a very short cleanish section to massive overdrive, its not a gradual increase in breakup. i believe the gain pot to be good and not causing this...

[anchovie]

What's the taper of the gain pot?

[REGNAD]

don't know its the stock pot. seems wrong to change it to audio taper if its stock pot is linear though.

[anchovie]

The stock pot should be audio, would be worth checking.

I'm not sure changing the tube would make a huge difference in terms of distortion. That's provided by hitting the rails of the op-amp, the tube (running on a incredibly low plate voltage) is supposed to add a bit of "character" to this.

Check that pot, there might be a linear fitted in error.

[REGNAD]

its stamped A500k, any more ideas? i'm not sure if i can hear any difference in amount of distortion from say 1 o'clock to max. i suppose this could be typical of this pedal, i dont know...

[Salvatore]

The 910 was designed to be violent.
I suppose putting a 12au7 in there would tame it a bit, I heard some enthusiastic comments about that.

Other than that it's hard to say without the schematics.

[REGNAD]

"The 910 was designed to be violent."
lol, dont have the schematic.