Kevin Lightner wrote:I've been looking for hours on the net the schematics to insert the right value resistor, to no avail. Lots of people mention they have the mod, but nothing more.
I have the Moog modification outlined here. Shows a diagram of the resistor locations and values.
Hope that helps a bit.
Moog factory service bulletin 830 pitch wheel mod.
Seem to remember a similar mod published in Keyboard magazine years ago with the added opamp.
The resistors added on the old style board(s) is shown on the right correctly at 332K each. (3 total.)
But the resistor to be added on the newer style board(s) is shown in the right spot, but with no value note is provided.
It should be 619K.
(all should 1% metal film types.)
Hi I'm new to the list but have been around synths for a while but not in a technical capacity. I just acquired my first Mini having started on an EMS in college, owned a Putney some time ago, own an SC Pro One now along with other polyphonic units.
The Mini was sitting in its case for 15 years so I have a technician working on the Mini. He's not familiar with synths like these but works on major concert backline gear and used to work for a company that manufactured QSC type power amps.
To his credit, he has brought back the Mini to be able to play, keyboard control is back and he noticed I need to replace some springs, bus bars, as the previous owner had repair work done on a busbar which made the triggering go off. Its an older osc model made in 1977 with white ribbed wheels.
I plan to get this ready for studio and backline major concert use so I need all the info I can gather as far as what has transpired since these Minis came out and in the hands of devotees.
I noticed a few posts on the #830 mod. I found the jpg Kevin posted. The heading says modification for all serial numbers.
After I got the Mini back from the tech yesterday, with his understanding that the repair is still not finished, I went through the calibration process, several times actually until I could get the osc's and the keyboard "lined up." It still drifts on the scale end hi and low and somewhat in the octave department on osc 3.
The first few times I did the calibration nothing was close until I realized the manual's note that range and scale trims are interdependent. I forewent the A-440 built in tuner although I calibrated that, and went high out to a Boss Tu-2 chromatic set tuner. Having had tuning problems on the Putney calibrating the Mini was like old times, more difficult than calibrating the Pro One with its trim pots on the front panel by the controls they affect.
My question: is the 830 mod still a desired alteration?
What does this correct?
I ask this because of the backline concern if an artist will be taken by surprise if the mod cancels out some other normal feature of the Mini when it was made. I don't know that much about the Mini, its quirks.
Also I noticed I got the same "sensitive" pitch wheel problem which throws the osc's out of tune if you merely touch it and you have to coax/fight it back to where it was in pitch.
Is there something else I should look for on the pitch wheel problem? Bad pot? Voltage?
Thanks!
) so that's OK
