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thanks guys, I read your posting and it looks like that was footswitch related possibly. Mine now has to do with low power/volume cutting out after 50% on master output. May be phase inverter tube (V5). thx.

Master Volume stops increasing (cuts out and/or less loud) after turning master output pot past 50% or so. geofex.com debugging page talks about a possible faulty phase inverter tube which for this model is the V5 position preamp tube. Anybody know how the phase inverter works with the rest of...

I am not the original owner. Serial Number is: RK-001537. What year was this head made? thx.

I just got a green stripe mark III head with all new Mesa tubes and have tried it out with 2 different cabs (one half-back Mesa with EV 150watt speakers) and a Genz-Benz 2x12 ported/baffled cab. Got the head and Mesa cab for $810. Seemed like a good deal. The rhythm 2 seems more appropriate...

I've had my 2004 series 1 RK head for about 6 months now and didn't have any problems with it until recently at the studio I had it cranked at around 6 master and 5 on ch.3 and ch.4 preamp volumes (yes, very loud esp. with all 6 output tubes going). After about 30 min's or so I noticed a...

I've had my 2004 series 1 RK head for about 6 months now and didn't have any problems with it until recently at the studio I had it cranked at around 6 master and 5 on ch.3 and ch.4 preamp volumes (yes, very loud esp. with all 6 output tubes going). After about 30 min's or so I noticed a...

I just bought a Mark III green stripe head with matching 4x12 half-open back Mesa cab with 150watt Black Shadows. There is a 1/2 power switch on the front near the standby switch. There is a Simul-class sticker on the back of the head. EQ and reverb on this one as well. There are two 6L6...