Quad: capacitor wired to input/1M resistor does what?

[4nkam]

Hey guys...I was just curious, what does this capacitor do? I noticed the IIC, C+, III, IV, and studio don't have this.

mJ

 

[fatboy135]

link the schematics or draw it and your question will be answered

 

[4nkam]

http://www.tubefreak.com/s-main.gif

Right under channel 1 and channel 2, between the 1M resistor and LDRs on the input, it says 20 something...

mJ

 

[fatboy135]

I never saw something like this, but 20 pF seems to be to roll off very high frecuencies, I could think that this cap is used for something like filtering, high frecuencies