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    Repair: Vestax DDG-1 mechanical parts


    by Jane is K.O.

    Vestax Corporation, Japan, 1977-2014.
    Wikipedia entry

    Info below took me too long to research, so i hope it’ll save you some time. Give me a comment, if i did, or if you can point to more useful parts or schematics/service manuals. Thanx very much.

    Vestax Japan is dead, no service manual or info from Vestax directly exists anymore – and two mid 1990s Vestax DDG-1 delays here need new potentiometers and switches.
    More information on the DDG-1 and predecessors i have collected here.
    For the lack of a proper service manual/parts list/schematic i provide below, what i can read from opening the device.
    Provided information is preliminary, and it should hopefully improve over time.

    DDG-1 MECHANICAL PARTS (upper board)
    Potis in red.
    Switches in green and blue.

    Potentiometers
    5x ALPS, Japan – RK11K114 (bushing) or K113 (no bushing) series
    • 4-pin (pin4 is a dummy, unused)
    • 0.05W
    • vertical type
    • shaft length 25mm – 27.5mm, diameter 6mm
    • with bushing (shaft hole in frontplate must be 9(.5) mm to mount with washer/nut (M9)).
    (Original washers/nuts, overpriced)

    Potentiometer values out of board – VR1-VR5 (red rings in image above)

    VR1 = 11k lin (=10K) DELAY TIME 0.5×-2x
    VR2 = 470k lin (=500K) LFO RATE
    VR3 = 5.6k lin (=5K) DELAY VOLUME
    VR4 = 20k log FEEDBACK
    VR5 = 100k lin LFO DEPTH

    Potentiometer variations (mostly unchecked yet)
    VR1 • Alps RK11K1140A3L (27.5mm)/RK11K1140A23 (25mm)
    rs-online.de 25mm
    Mouser.de 27.5mm
    Replacement Bourns PTV111- 15mm
    Replacement BI Technologies/TT Electronics – P110KH-0F20BR10K
    Product info @Alps
    VR2 • ALPS ??
    VR3 #1 Marshall pot SKU 51667 … more expensive here
    VR4 • ALPS ?? Use 100K with 33k in parallel
    VR5 • RK11K114F30C0B104 (30mm) Reichelt.de short shaft Mouser.de 30mm center detent ALPS RK11K1140A72 ONLY 20mm

    Search on Aliexpress
    Check Bourns PTV111
    Check BI Technologies/TT Electronics P110KH

    Conclusions: ALPS RK11K114 don’t use pin 4 and have plastic shafts (bad). So it seems more feasable to put Molex 2.54 mm connectors or something similar into the board, using only 3 pins. Each of them would connect to a flat band cable which would then connect to a 3-pin fader of your choice mounted traditionally with washers and nuts to the outer case. I’d be super open to use the standard 3-pin alpha pots used in most Eurorack modules today.

    Drawback: If you open the unit again you’d have to untighten nuts and washers.


    Rotary switch 5-pole ALPS, shaft length 25 mm – SRBV variations
    • SW1 – similar to SRBV150901. Shaft length doesn’t match – Mouser.de


    Toggle switches
    SS1- SS3 seem rather hard to find.
    The original part looks like this. I also found this Chinese supplier link, but i don’t want to order 100 pieces ;) This could work as well.


    I don’t give up on original parts yet. Again your helpful hints are very welcome. Let’s build a database/service manual for us few users of this legendary delay.

    HELPFUL
    ALPS resistance tapers – pdf
    How to check the taper
    How to measure ALPS shaft length
    About knobs and shafts

    +++
    ABOUT THE AUTHOR
    Jane is K.O. aka jayrope is a Berlin-based composer, producer and musician.
    More info: jayrope.com



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