Repair: Vestax DDG-1 mechanical parts
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.
5x ALPS, Japan – RK11K114 (bushing) or K113 (no bushing) series
• 4-pin (pin4 is a dummy, unused)
• 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)
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
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.
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.
ABOUT THE AUTHOR
Jane is K.O. aka jayrope is a Berlin-based composer, producer and musician.
More info: jayrope.com