Tube Amps / Music Electronics
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|previous: Bruce Ha! Ha! Me too Dave. :>)||View Thread|
|8/25/1999 9:55 AM|
|Steve A.||Re: cap across pot mod|
to Bruce and Dave:
A 100k to 470k resistor in parallel to a bright cap on a guitar volume control makes sense. But I was going on the assumption that evan did mean a 100R to 470R resistor and that it would obviously have to go in series with the bright cap (a 100 ohm resistor across the ungrounded terminals of a 250k to 1M pot would essentially convert it into a two terminal variable resistor- but then again maybe that is what he is doing...)
As long as you have your calculator out maybe you can analyze this Ck setup I've been using a lot (for an intermediate gain stage that can't handle the full boost of a Ck cap without going into fizzy distortion): a 1.0uF poly cap, but with a 3.3k resistor in series on the leg to ground. Rk is 1.5k and Rp is 100k. My ears tell me that the frequency is roughly the same as a 1.0uF cap across a 1.5k resistor, only that 3dB gain is cut back a bit...
|Dave H. Steve,|