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I have a Mark IV (B) that I have used regularly and that has never failed on me. Lately, I haven't used the amp for 1 1/2 years or so. After taking it out of the flight case, switching the power on, letting it warm up for about half a minute, and then switching it from standby to on, the amp...

I have a Mark IV B which has recently developed a hum problem that i want to eliminate (naturally ;-) ). Here ist what I have observed so far: - With the amp turned on, the hum appears even when no cables at all are connected. - The volume of the hum is dependent on the output level control...

I have some questions regarding a Simul-Satellite that I've just bought on eBay: - I've noticed that there are two phone plug connectors on the bottom side of the amp, between the input transformers and the power tubes. One of them is for a remote switch of the EQ - but what is the other one...

I've just bought a 1991 Simul Satellite on eBay and when it arrived I was quite astonished to see that it has 2 blue EL34s in the inner sockets and 1 blue and 1 green 6L6 STR420 in the outer sockets. I guess this is not how it should be, is it? I want to use this amp together with my 1994 Mk-IV...

I have a Mark IV B that I want to use with an effect module that has two programmable relays. Is it possible to switch between the Mark IV's three channels using only two relays (e.g., Rhythm 1 should be active when both relays are off, Rhythm 2 when relay 1 is on, and Lead when relay 2 is on)...