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14th December 2008, 04:43 PM
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diyAudio Member
Join Date: Aug 2008
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Loudness Control Calc - Help Please
Hi!
I have totally broken 500k volume control potentiometer with tap from the middle for loudness control. I cannot find 500k anywhere, but I can get 100k-250k (with the tap) from vintage SS amps. The question is - anyone may help me recalculate values of caps used in loudness control - C14 and C15. Additionally, since input resistance of volume control block will be at least twice as low, coupling cap C13 needs to be changed, too, I believe, from 0.02 ukF to 0.033....0.047 ukF as per high-pass filter calculation (corner freq. 19.3 ... 13.6 Hz). May this change affect somehow low-cut filter after volume control potentiometer? Thanks in advance for any suggestion(s). |
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