[sdiy] Oscillator caps - please help!

[Antti Pitkämäki]

Hello everybody,

I'm currently having a project of fixing a Vox Super Continental (UK model) 
combo organ. I have decided to first order every part that I could possibly 
need before starting the project. However, I have a problem. The 12 master 
oscillators of the organ each has a coil, and two caps. Of the two caps, 
other one has the value 0,1uF on every card, and the other cap has a 
different value depending on the card. Now the thing is, that I've heard 
that you must use polypropylene caps in oscillator circuits like these, so 
that the tuning is stable and doesn't drift so much with changing 
temperature. Unfortunately it seems to be impossible to find replacement 
polypropylene caps that have the right value. For example, the value of 82nF 
(0,082uF) is used several times. So this has made me wondering... Maybe the 
organ doesn't use polypropylene caps in the first place? Maybe I have been 
misinformed? I did find replacement 82nF "Metalized Polyester Film" caps - 
could I use these for example? What caps would you use? I guess I could try 
to come up with the correct values by combining several polypropylene caps, 
but maybe I don't need those kinda caps? Please help :) I know that my 
question is a very basic question, but I gotta be a beginner before I can be 
a guru :)

Antti P.

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