kmanick
Well-known member
One year later (from OP)
So did end up sending this back to Mesa and they addressed the popping issues I was having as well as the lack of gain on the lead channel and lack of volume.
Mike B did do the work, so he is still doing some. Took 12 weeks total turn around
"replaced shorted cap in lead circuit causing low volume gain and volume and bad switching pop. Tested with FTSW too. Upgraded the .1/400 volt caps at V5 to .1/630 volt. Added grid isolation resistors at A/B socket too. Cleaned jacks, burn and playtest. Labor 1.25 hrs." $160.00
now this thing is breathing fire, my R2 channel has almost as much gain as my lead channel, the best R2 of any Mark IV I've owned so far
I now have a real clean/rhythm/lead set up with this head
V1 NOS Mullard Blackburn
V2 high gain JJ
V3 NOS RFT
V3 chinese square getter Shuagang
V5 Sovtek LPS
Sounds f'n killer can't wait to try it out at rehearsal on Tuesday
So did end up sending this back to Mesa and they addressed the popping issues I was having as well as the lack of gain on the lead channel and lack of volume.
Mike B did do the work, so he is still doing some. Took 12 weeks total turn around
"replaced shorted cap in lead circuit causing low volume gain and volume and bad switching pop. Tested with FTSW too. Upgraded the .1/400 volt caps at V5 to .1/630 volt. Added grid isolation resistors at A/B socket too. Cleaned jacks, burn and playtest. Labor 1.25 hrs." $160.00
now this thing is breathing fire, my R2 channel has almost as much gain as my lead channel, the best R2 of any Mark IV I've owned so far
I now have a real clean/rhythm/lead set up with this head
V1 NOS Mullard Blackburn
V2 high gain JJ
V3 NOS RFT
V3 chinese square getter Shuagang
V5 Sovtek LPS
Sounds f'n killer can't wait to try it out at rehearsal on Tuesday