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  1. C

    "The Cleaner" customised module

    Bit of a blast from the past, but did Matt ever do a review of "The Cleaner". I'm still using the two original modules I built and still like them every time I play 'em.
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    anyone know about trannies? in the RT2/50?

    How can you tell if they are Heyboer? My two RM80s have very little in the way of markings on the transformers. From memory the output has a sticker with OT-75 on it.
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    RM20 power amp mods

    Thanks for pointing out the errors. All fixed now.
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    3 Tube Module?

    Very cool.
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    Your Favorite Module Tubes for your Higher Gain Modules

    Interesting. They're great in my clean modules, but I've steered clear of them for high gain use because of the increased risk of microphonics. You haven't experienced any of that? I'll definitely give them a go in V1 on some high gain modules....
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    Carvin Quad-x Preamp?

    I've got one. It was my primary pre-amp before I got into the Randall MTS stuff. It's a "good" bit of gear but in stock form the sound falls a little short of being "great". Clean channel is OK but nothing special (yet to hear a Carvin clean channel that really does it for me). Channel 2 can...
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    RM22 Footswitch

    This would suggest that the microcontroller programming on the RM22 version is different than the RM100 version.
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    RM20 Combo Boost Not Working

    On what do you base this? See circuit diagram below of RM20 input stage showing how the second half of V1 is switched into the circuit when the boost function is engaged. The boost gain pot (not shown) acts as half of a voltage divider on V1:
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    RM20 Combo Boost Not Working

    Did you try replacing V1?
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    RM20 Combo Boost Not Working

    You may well have a bad valve in V1 or dirty pins/socket. Try another 12AX7 in there. V1 is the tube closest to the input socket.
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    RM20 Built-in Boost function

    I don't think this is right. After looking at the schematic for the RM20, the boost function uses the second half of the first 12AX7 (V1) to provide a gain boost in the signal path after the first input stage (1st half of V1) but before the first gain stage of the module. The boost level...
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    Fave clean and why....

    Well I really like The Cleaner (but I'm biased ☺).
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    RM20 power amp mods

    I've added some pictures here that should help out - http://faqload.com/faqs/music/randall-rm20-master-volume-mod
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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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    MIDI hack

    What a great DIY project. Awesome stuff. Thanks so much for sharing this and documenting it so well.
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