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Old 21st February 2014, 03:45 PM
Richard Richard is offline
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Join Date: Dec 2005
Location: Notts
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Default Re: Phono 3 with 5751 valves

Originally Posted by bevensee View Post
Sorry, but I don't get this. Can someone explain?
- R13/14 is not 1M
- I you use 0.1 uF into 1MOhm, cutoff is only 1.6 Hz

I guess my question is: If I want to get rid of the switch, and have a corner freq. of the subfilter around 20 Hz, What value should I use?
What if I want to increase the slope to 12 dB per octave, how do I do that?
Hello and welcome

Yes sorry, typo now corrected thanks, read R9/10 1M.

The 20Hz filter was the middle one I think so just check with your meter which caps are connected at that switch position.
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