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  1. N

    MK IVB resistor identification

    Hi. I´m pretty sure it´s a 39.2 ohms five band resistor. Orange--White--Red--Gold--Brown. I have a Mark IVB. Cheers.
  2. N

    where to buy LDR to fix my Mark IV lead channel problem

    Thanks guys! I have switching problems with my Mark IV B. When I switch to lead channel from the switch selector in the back of the amp, i get not gain but a soft sound sure not correct. Also the lead gain red led don't blink so it must be a problem with some LDR optocoupler I guess. Is there a...
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    where to buy LDR to fix my Mark IV lead channel problem

    From mesa directly? Any help please
  4. N

    Mark IV combo. Restoring it to it´s past glory.

    Hi! Great to be it this forum! I recently bought a mark IV serial number IV006657 (don´t know when it was made) combo that has some issues. First, the 3 gain pots, Ryth 1, Rythm2 and gain control pots, were change to non push pull pots. Weird. The Reverb is dead also. I´d like to get it back to...
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