Re: Best humbucker for Van Halen sound?
I bought a variac but I am scared I'm gonna eff my amp up. Do you have any abnormal tube wear or issues with transformers?
None whatsoever. I've been running mine (4 hole plexi type circuit) 100% of the time with the variac for 3 years straight (100v)... and I love
the tone so much that I'm never going back to normal voltage. I've usually got the volume up to 8 (I slave the majority of the time) so
it's being pushed good.
The key is to bias your output tubes *after* you've dropped the voltage.
In my case, I have a pair of EHX 6CA7s; I set plate dissipation at 70%, or -40mA (standard for EL34 types).
I had to futz with the bias resistor to get the correct range, though. The stock resistor, after dropping the
voltage, wasn't giving enough. Not surprisingly, the tone was super mushy.
The only other thing to consider - there is a theory out there that if you go too low voltage for the heaters, cathode stripping occurs.
I can't attest to that from my own experiences but then again I dropped down to 100V, not 90V. Don't remember exactly
what my heaters were at but IIRC they were a hair under what they should be.