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I'd like to know too.

Thanks. It behaves similarly in Class A, but only when I'm in front of the amp. I've also noticed the filaments in two of the three functioning power tubes are glowing weakly. Does this mean these tubes are nearing the end of their life?

My lead drive is set to 7 as well, and I am using the Harmonic setting. Whenever I move farther away from the amp, it seems to disappear, so it looks like you are right. Also, I tapped on all the preamp tubes and they seem to be fine. However, I just noticed that one of my power amp tubes (the...

I just got a used Mark IV Combo and I'm having trouble with the sound. When I run it on Full Power on the Lead channel I get this horrendous screeching that swells, but I can't tell if this is just feedback or a tube problem. When playing, the tone sounds flaky, and is riddled with fuzz. Oddly...

Yes, I'm working on it as we speak. I found someone with an attenuator I could borrow. Thanks for all your help guys! Much appreciated!

Thanks for all you help guys. I truly appreciate it!

Thanks guys! I haven't been able to make my Mark IV sound good at low volumes, and I've been told that it really starts to show its muscle when the master is around 3 or 4, but at that volume it's still way too loud for bedroom use, even on Tweed Power and the Class A setting. I only got it...

I'm trying to run my Mark IV Combo with a THD Hot Plate. The manual for the THD Hot Plate states that: I can picture the wiring but I'm not sure what cable I should purchase. Are most cables the same or is there a real difference in quality with some brands? Also, I'm looking for some...