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... my 1978 Mk II 'A' is still all original, without any issues whatsoever. Maybe Mesa has used caps for the Mk IV that do not last that long ...

... agreed. I have meanwhile exchanged the tubes for a test, and it had no effect. So, likely, one of the caps. As long as everything is fine after two minutes or so after power-up, this is not much of a problem. Otherwise, I'll probably have to send the amp to a tech ... The amp is from 1994...

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...

... and, just out of curiosity - why would you want to change the fixed bias at all?

... you may want to take a look at http://www.mesaboogie.com/US/Smith/ClassA-WebVersion.htm - maybe the answers are in there.

... it is like I said - one jack is for a standard on/off footswitch and the other one is for linking the Satellite EQ to the Mk-IV's Satellite EQ remote control jack. I just tried it out. BTW: According to the schematics of the Simul Class power amp stage the Class A / Simul Class switch...

Thanks a lot, Stephen! Just for clarification: You use one jack (the one next to the input transformer) for hooking up the Mk-IV's Satellite EQ switching feature, and the other one (the one next to the power tubes) for connecting a standard EQ footswitch. Right? Why then do they provide a...

I have sent them a fax (I couldn't find a support email address on their web site) five days ago and got no reply yet. Hope they haven't forgotten me?!

No reverb tank (I think there weren't any Simul-Satellites with reverb), and the connector for the boost footswitch is on the front panel below the input - so the second connector on the bottom must be something else ...

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)...