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  1. A

    Lowering the wattage on my Mark IV

    Just run it in Class A and triode, cuts it down to about 35 watts !!
  2. A

    Mark IV versions?

    Sonically identical, the medium head has more switches on the front, the short has them on the back instead.
  3. A

    are E34L safe in the outter pair of a simul MKIII

    The important thing is that you only use power tubes that are within spec for use in Mesa amps.The right type of tube of the wrong spec could be very costly !!
  4. A

    Mark IV's FX loops keeps going quiet

    No coz it is only the B half that sounds dodgy. V2A is also a lead gain stage and that seems ok, just the V2B half is suspect, put it in V4 and see if the problem goes away. It's not a permanent fix by any means, but it will eliminate if the tube is faulty or not. :D
  5. A

    Mark IV's FX loops keeps going quiet

    You MUST have a tube in V4 as one half is a gain stage for the lead channel !! :shock: V2B sounds like the loop problem and V4B is the reverb send stage.Just swap em see if it makes a difference.
  6. A

    Mark IV's FX loops keeps going quiet

    Try swapping V2 with V4, I doubt you use the reverb anyway ?? :)
  7. A

    Tubes to replace STR-420 and 7025 12AX7s?

    The STR420 is a Chinese tube, great tone but short life usually !! What make are the preamp tubes you bought ?? The Ruby tubes are in spec for use in a Boogie I assume ? Cheap tubes are a waste of money, ALWAYS buy preamp tubes that are tested for high gain and low microphonics, and always buy...
  8. A

    Tubes to replace STR-420 and 7025 12AX7s?

    No you don't :D
  9. A

    STR-430s...how old?

    I'd say about 2006. My 2002/3 Single Rec has STR430's, my 2007/8 MKIV has STR 440's.
  10. A

    Mark IV effects loop

    Try changing the 12ax7 in v2 (next to the shielded one), that powers the FX return stage.
  11. A

    Mark III "pop"

    Does it do it at different locations, thermostats i.e. refrigerators/freezers or even light switches etc can make a pop sound through an amp if in the same mains circuit ??
  12. A

    ...New DC-3 head owner has several questions... Please read!

    The fx mix doesn't affect volume, just the ratio of the wet/dry signal. :D
  13. A

    Quick question about loose tubes

    If the tubes are in all the way, they shouldn't be loose at all. Sounds like the bases are worn or damaged :(
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    Anybody looking for Mark IV's , Here now it's your chance

    My MKIV is a keeper, I wouldn't use the MKV tube rectifier modes, only advantage I see for me is the Solo function, but I can live without it !! :D I have no problem with R2 either.
  15. A

    My problem with the Mark V design

    The MKIV produces 50 watts when just the two outer tubes are selected, supposedly Class A.
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