ruffrecords said:
I have looked at that video several times now and I am convinced it is a switch. A very nice smooth switch but a switch nonetheless. I can clearly see places in the early part of the video where the knob clicks into place. If this is a Daven attenuator then it will be very smooth acting and could easily be mistaken for a pot.
Cheers
Ian
That would mean alot of clicks, 5 or 6 between each dot? which would mean a lot of resistors.
Hopefully someone who has used one can confirm either way but it could be a clickless switch, a stepped pot whatever you want to call it. Make before break operation but with smooth travel. I watched it again but theres points where it moves smoothly over a very short arc.
These may be the type of hand-wound resistors that Kevin Ink referred to:
http://www.groupdiy.com/index.php?topic=41962.0
...21 contacts with, it looks like 20 resistors total, obviously configured as a dual pot in that unit. You can see on the OP-6 schematic that the lowest position is marked 20 and the top position marked 0 which is 21 total, theres 12 missing positions in between which is very confusing. The panel marking for the gain knob is marked 0-20 all the same. It seems to be making more sense to me now and that your instinct about it being a switch is right, something I didn't consider was that the contact wiper could move smoothly between positions and without clicks which is what I believe is happening, although you might not agree with that. I remember I made a Grayhill rotary switch work like this before by accident; reassembling it with the contact wiper upside down.