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Hi Rick, That was a fun question. I played around with switching back and forth between Ch1 and Lead and a few other settings a bit last night. I'm sure differing combinations of guitar, pickups, and speakers could present a pretty broad band of tonal impressions in the switch, but this is what...

Maybe a similar issue here. I have a Mark IIa export head dated 1979, she's got a pretty big looking transformer. I'd like to know if anybody has advice, and/or experience with modifying the Gain Boost feature. I love the character and the nuance in the breakup when the Gain Boost is engaged...

Bummer about the FSW jack, yikes. Yeah, and I use the Silicon Diode rectifier setting often, especially when it's acting weird or blowing fuses, or if I'm playing some place where the power looks or sounds a little suspect (I really do prefer the Tube setting and use whenever I can). Switching...

Did a couple of gigs in the last weeks, blew fuses each occasion. At rehearsal yesterday Ch 2 became very noisy w crackle, and Ch 1 output is considerably less volume than I remember. Anyone else notice large output differences between Ch1 and Ch2? Not including engaging the boost switch on CH1...

JJ 5AR4 rectifiers consistently failed for me. One from Tube Amp Doctor worked out in that role without too much problem until recently.

Not a mark V, but I have experienced some extreme radio problems with my Heartbreaker, not all of which are located as amp faults. I run at very high gain, use pedals, often play single coils, rehearsal space is wired 'interesting', and we are located on a hill with radio towers a couple blocks...

Thanks for checking back Monsta, I just looked. In the opening pages they advertise using the Rectifier Select technology at full power, though they talk about using Bold/Curvaceous and engaging Tweed for vintage feel. The back panel and manual do say to use Tweed and Tube Rectifier settings...

Thank you Monsta, much appreciated. I found some more on descriptions on the Eurotubes tube description page at http://www.eurotubes.com/euro-e.htm and I think I glean the quiet tube comment now. It's also good to know that the repeat failing rectifier thing is fairly common, sometimes I begin...

I had the exact same behavior. It was a bad preamp tube, once replaced all was good on that front. I also have a Heartbreaker - it's currently roleplaying as it's evil twin: the Walletbreaker. I'm hoping you all can help me out with a preamp puzzle (you out there Andy?) I'm looking at cutting...