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AKG BX20E spring reverb - how to sold the 5 pin plug

Discussion in 'Reverbs / Effects (outboard)' started by Alfiea, Jan 9, 2007.

  1. Alfiea

    Alfiea Guest

    Hey there.
    I recently bought a BX20E AKG spring reverb but the remote is not working. I have to sold the 5 pin plug connector. Can anyone help me understanding what the 5 pin stands for or how to find a diagram that explains it.

    thanks in advance
  2. moonbaby

    moonbaby Mmmmmm Well-Known Member

    Feb 23, 2005
    Welcome to RO, Alfiea. We have an esteemed moderator, RemyRAD, who has had a bit of experience with AKG reverbs, as have others on this site. I'm sure that they'll be posting a reply to you regarding this issue, as this unit has been discussed on this forum before. I was the owner of a BX10 for some years, but that one had the controls on the actual box. BTW, please let us know where you reside ( at least the country you live in). Many times this will assist your getting the proper info for a request like this.
  3. Alfiea

    Alfiea Guest

    Thanks for the replies - well im of to do som soldering.
    I'm from Copenhagen - denmark, plays the saxophone and just recorded my trio debut album - sounds great. I hope that your replies will make it sound greater :D
  4. Kev

    Kev Well-Known Member

    Nov 13, 2001
    I'd love to know what the answer was

    just a guess

    shield on pin one and then pair + pair
    with hot/cold, hot/cold


    shield on pin 3 with a pair on each side ... ??
    with hot/cold and hot/cold
  5. RemyRAD

    RemyRAD Member

    Sep 26, 2005
    I actually have one of those still sitting around! Very nice of Kev to post those links for the manuals to that unit. In the day, it was a truly beautiful sounding dense lush reverb with none of that sizzling stuff you got with that other humongous gizmo. The biggest problem with the unit was it's extremely fragile. Each 3 meter spring is supported internally at numerous places along the frame with these teeny tiny springs, that look more like an ingrown hair than a metal spring! They have a tendency to break and when that happens, you will hear a "knock" sound with certain transient sources. That's what all of the adjustments are actually for in the concept behind their "Torsional Transmission Line". Your signal is actually fed into both ends of the spring while picking up the signal simultaneously from both ends of the spring! The direct signal is electronically combined out of phase and so disappears! Your then left with just the sound of the spring, picked up from both ends which basically make sure 3 meter spring, a 6 meter spring while being able to null out any inconsistencies in the reverb with the remaining internal adjustments. You are supposed to be able to null out any unnatural sounds by adjusting those controls but you will find that you cannot get rid of that knocking sound! It's because the spring is damaged and even if repaired, as my old unit was by AKG, by the time it's shipped back, it's broken again! And the two channels will never match again sonically, when used as a stereo chamber. Dammit!!! Otherwise, it makes for good mono reverb.

    But was your question about the remote control for the decay time?? The wiring for one? It's in the links/PDF files. Very simple. 25,000 ohm linear taper potentiometer, for each channel along with a 16,000 ohm shunt and a couple of fixed resistors for good measure. You don't need the lightbulb as it's nothing more than a pilot light. Besides, they would blow out in a couple of years and nobody ever replaced them.

    I just like the teak box! Don't know why the Austrians put handles up on the damn thing, it wasn't meant to be portable or moved much at all. Go figure? I was considering selling mine, but I like the box. Makes for a nice piece of furniture.

    From the land of Mozart.
    Ms. Remy Ann David

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