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    RM20 power amp mods

    Have done a few mods to my RM20 combos and heads that others may be interested in. Master volume mod: - lift the right side (looking from the front) of C9 from the board; - solder to pin 1 of an A1M pot (1M log / audio taper) pot; - solder an 0.1uF cap from pin 2 of the pot back to the vacant...
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    Circuit diagram RM20

    Anyone have a circuit diagram for the RM20?
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    WTB: RM20 heads or combos

    I'm chasing a couple of RM20 heads. Prefer unmodified/stock. Cheaper the better as I'm going to have to get them from the US to the land down under.
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    WTB: stock recto/rectified/treadplate/grail AUS

    Anyone got a stock recto/rectified/treadplate/grail in Australia they want to offload?
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    "The Cleaner" customised module

    Love the Randall MTS system. Only stumbled upon it about 12 months ago and since that time I've gone on an acquisition frenzy along with modifying to suit my tastes and needs almost every module I've got. In doing my mods, my focus has been on pursuing tone and feel that makes me want to play...
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    Orange OR15 module

    Anyone built one of these? If so, did you use a stereo/double gang gain pot to simultaneously adjust gain feeding second and third gain stages?
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    Broken modules in Australia

    Does anyone have any modules in Australia they are looking to get rid of? Not working is fine as long as the PC board isn't cracked. Just looking for some cheap modules for experimentation.
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    RM50/80 all MOD 50 boards

    Another quick question. I know the RM50/80 is based on Egnator's MOD 50, but I was surprised that every board in my two RM80's is labelled EGNATOR MOD50. There is no mention of Randall on any of the PC boards. Is this normal? My two RM80's were only recent bought but were NOS items brought...
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    RM 80 crackle problem

    I've got two identical RM80 combos (they're basically an RM50 with 6550 power tubes and 2 x Celestion G12T-75 speakers arranged diagonally in the case). On one of them, when using high gain modules I get a crackle in the background which becomes audible when a struck power chord decays. It's...
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    Randall RM20 6v6 power tubes

    I'm really liking playing round with my RM20. Have been going through a bunch of different 12AX7's in V1 and V2 on my Ultra module with some interesting results. I'm now thinking of doing some power valve experimentation but the RM20 documentation is a bit light on in terms of what other (than...
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