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  1. H

    Resistor on Send tip

    Greetings! On my schematic of a C +, there is a later factory mod to the effects loop send in which a resistor is placed. Anyone know what this would do? Does it reduce signal a bit for effects and reverb? since reverb is tapped off return jack.Tia, Blessings.
  2. H

    Recall the 2:90's Mesa!

    Browsing old threads on many issues w/ the 2:90. That pop and thump cannot be fixed switching between Half Drive. And the other voices as well. Not to mention the issue with the melting plastic clip from PT. It is currently Sept. 2nd, 2022. I just finished talking with tech at Mesa. Said this...
  3. H

    2:90 Question

    Greetings ! I thought those LDRs was to eliminate that nasty pop and thump while switching on and off Half Drive? And, Are the transistors in the switching matrix of a 2:90 JFETS or junction trans. ? Tia! Blessings.
  4. H

    120pf cap

    What does the 120pf cap do in the older C+'s in the effects loop ( connected to cathode to grid on V2A )? My schematic says they were removed after August 1984. My DRG C+ still has it . will someone please explain its purpose and why it was removed? Thank you for your time.
  5. H

    Simul 2:90 pop?

    Greetings. So is there a fix for the dreaded popping noise with half drive or not? If not, shame on Mesa. That pop is unacceptable.
  6. H

    2:90 experts?

    Greetings. Are there any tech/ 2:90 experts in the house? Ty!
  7. H

    DRG C+ fix itself?

    Greetings everyone! Ya know, I've reached a pinnacle in my life where I would like to know and understand some things before I leave this shitty, broken planet soon. One in particular is that I purchased a factory DRG C+ in 1984. Suddenly my Simul Class switch when engaged kicks ***! Never has...
  8. H

    Weird.

    Ok, the other day I was playing my DRG C+. It sounded ok. Occasionally, with amp on, I'll unplug input and get a pencil and very gently tap on preamp tubes to check for microphonics and other noises. I also turned all of the front knobs just to loosen things up. Put settings back exactly where...
  9. H

    Master One pot value

    Sorry for flaming. But I need input. I have a factory C+ DRG . Mike B. repaired it a while back. He replaced some pots. He put a 250k pot in the Master One. Some schematics says a 1meg. What's the difference and what should I go with. Thanks for your time.
  10. H

    Orange drops

    Hello. I recently seen a video about Orange drop caps. How the foil end (the black band mark, Mallory's have them but not Sprague s) should be installed in amps . When going down the assembly line, it's not sure , when inked, that the banded side is correctly marked. The tech in this video used...
  11. H

    Foam in verb?

    Hello, so I was reading some older posts and read one about MB going over an amp and servicing it. He posts what Mike did to his amp. One that I'm wondering about is that Mike replaced the deteriorating foam inside verb tank. Does anyone know what function that foam does? Why is because I...
  12. H

    Fan Hum

    So I put a new verb tank (9AB2A1B) in my DRG C+ long head a few months ago and its so sensitive. When I turn up verb , with the cooling fan running, the fan makes a hum come through my speakers. Not a constant hum but gets louder as verb pot is turned up. Un plug fan, hum is gone. I put the...
  13. H

    Who's the new C+ guru?

    Hello, I have been browsing very old threads from 2006 ,2007 ish. Boogie Babies was very respected and well versed with the C+'s. He knew them as well as MB. There were others as well but he was the go to guy. I see that he doesn't come on here much if at all. I hope that he is ok. Is there...
  14. H

    Simul Class C+

    Forgive me if this has been addressed. I've had my DRG for a very long time and I never pursued this. People with Simul Class rave over the tone but with mine, when I engage SC, it just boosts the volume a little. Nothing to rave about. What am I missing here? Did I get a lemon OT? You would...
  15. H

    MKIIC+ voltages

    Hello. I have a 1984 C+ DRG . Does anyone know what the ballpark voltages should be? My B+ is 522v, C is 507v, D is 497v and D+ is 491v. The plate voltages for power tubes are 525v . And all of the plate voltages are running high on preamp plates. Years ago I recall measuring the plate voltages...
  16. H

    Tone stack caps in C+

    Greetings. I have a1984 DRG C+ and have been tweaking the tone stack caps. Haven't replaced any yet although i have two micas for the treble and treble shift and the other 715P's drops . Question: when inside, i removed the old silicone that bound the two 250pf and 750pf's and straightened...
  17. H

    MKIIC+ ++ mod

    Howdy, Anyone know what one can do to eliminate the pops that come along w/ these great mods (The ole "Fire Breathing Dragon". All credit goes to Boogiebabies , as I was told and to JB32 for a great schematic of the C+.) using a poor man's switch? Thanx!
  18. H

    Praying

    Hoping, ... I hope and pray that the techs who used to help us peeps are still above ground. Silence is deafening.
  19. H

    White noise.

    after recapping my DRG, with same pedals in front, hiss increased dramatically. Any advice?
  20. H

    Simul,s outer

    I'm just replacing my outer sockets on my DRG. It's a C+. I tube roll tween 6L6's and EL34's. What screen resistor value would anyone recommend? 470's, 2.7k's, 1k's? I'm gonna tie pins 1 and 8 together. My bias resistors are 220k on outer, and 2.2k on inner. Peace. Jim
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