Conclusive proof this evening that only a couple of volts drift affect the amp tone.

We started our rehearsal with 242.5 volts (UK) and it sounded great, then after a while between numbers I was just playing about, clean, and thought it had lost its edge checked my guitar to see if I had nudged the tone pot, but no, checked the plug in voltmeter and lo the voltage had dropped to 240.2

Then later it was down to 238.7, what a difference!!!  lifeless and dull. Now I need to see how the bias drifts over than range. So I will take my DMM with me as well next time. Or maybe theres more to it than that?

It definetly makes a difference. At peak consumption time around here, my incoming voltage drops to around 118-119 Amp sounds kinda dull. When it's back up to 120-121, the amp sounds much more lively.

I think is has more to do with the preamp than the output side. That's why I think if one wants to put VVR in of these, it should be output side only.

Gregg

Would this mean that using an OTS with a 240v PT in a 220v contry isn't ideal? As in it would have a tendency to sound dull or lifeless?

Nik once emailed me about this concern. He said it doesn't matter and my country also peaks at 240v+ anyway.

Thanks for these new findings, definitely worth investigating. I did notice some amp "moods"

Nick

more than enough