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  1. Rob S

    Mark III circuit board experts chime in

    It’s a bit hard to see on the pics where the right wire (looking from the rear of the chassis) goes from the R2 volume pot. Can you try to get a pic from a different angle? Seems like R130 and 131 were removed completely.
  2. Rob S

    Mark IVA loop feedback issue, eq led. Are my LDRs going?

    Yeah that’s a bit of a problem but it’s just fine that you get support when needed. Got mine used, too btw. I’m mostly a Mark IV guy because this was my first Mesa amp. It was well used and had some issues after a while with some leaky caps that were hard to identify. As it took some time and I...
  3. Rob S

    Mark IVA loop feedback issue, eq led. Are my LDRs going?

    I wished I could get my Mesa collection serviced at HQ, but I don’t live in the US so it’s a pricey thing with all the extra shipping and custom clearance stuff along the way. I try to maintain a good state of my stuff on my own and had received great support from HQ when one of my Mark IV was...
  4. Rob S

    Mark IVA loop feedback issue, eq led. Are my LDRs going?

    Got two Mark IV A and at some point had the same thing noticed. A slight tap with the finger and / or a bit of light wobbling at the LED did the repair for me. Works fine for quite a while now without any flashbacks so far. The problem with the loop is weird tho, I’d check the jacks first with...
  5. Rob S

    Mark III - Volume Pot Mod - R2, yeap, yet again...

    Okay, I did the mod today anyway and went for the placement at both lugs of R130… What it does now is exactly what it says: You can adjust the Volume of R2 when it is activated. No affects on anything else :-/ I sourced a genuine Mark IV Treble pot with the matching knob for the mod btw...
  6. Rob S

    Mark III - Volume Pot Mod - R2, yeap, yet again...

    Hi, and thanks for the nice description! I’m new to the forum as a member (have been reading for quite a while before) and want to perform the R2 Volume mod on my Mark III red stripe DRGX 15“ head. I already did some work on it but it’s technically still in stock condition as far as I know...
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