Moog Music Forum

Just wonde if anyone can let me know which OSC Board I have I thinks its the old one..



https://www.box.com/s/hoc9df2bmdpzh8nxsi4a

while looking for a fault I noticed there was a Cap which was unconnected on one leg is this correct

cap not connected on one leg ?
https://www.box.com/s/z9tirneofh93x0imxroi

From the pictures, your Minimoog D oscillator board is the old model, dated 1972.

If one leg of the shown capacitor is broken, or loose, that can potentially be a problem for oscillator oscillator 1.
It is C2 that is directly connected to one of the transistor pairs for the current mirror of VCO 1.

Replace it, or re-solder it properly.

Your rev is generally called "the old board", but there's actually a board style that's earlier.
It was in the early RA Moogs and maybe some Musonics models.
It is easy to identify because it has a vertical piece of metal on the right hand side used as a sort of heat sink/stabilizer.
Back then they used 1 tempco resistor (temperature sensor) for all 3 VCOs.
Later (your board above), Moog used a separate tempco resistor for each oscillator and did away with the metal piece.

I have one of these really early boards here now, but sure someone else has a pic already available here.
Maybe MC. I think he has one of these earlier style boards.

Kevin Lightner wrote:Your rev is generally called "the old board", but there's actually a board style that's earlier.
It was in the early RA Moogs and maybe some Musonics models.
It is easy to identify because it has a vertical piece of metal on the right hand side used as a sort of heat sink/stabilizer.
Back then they used 1 tempco resistor (temperature sensor) for all 3 VCOs.
Later (your board above), Moog used a separate tempco resistor for each oscillator and did away with the metal piece.

I have one of these really early boards here now, but sure someone else has a pic already available here.
Maybe MC. I think he has one of these earlier style boards.