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RE: So why are you stressing it.?

Posted by Lew (A) on July 22, 2024 at 14:28:40

In Reply to: RE: So why are you stressing it.? posted by Mendel on July 17, 2024 at 10:55:56:

The coupling capacitor value in conjunction with the input impedance of the following stage together form a low pass filter, as Tre' pointed out. He showed that on the assumption that the grid resistor of the following stage is at least 100K ohms, which is reasonable, the low frequency cut-off is around 1Hz, even with the 1.5uF coupling capacitor value. This is much more than adequate to assure a flat response down to 10Hz. Even if the grid resistor is 50kHz, you are still in good shape. What I think may account for the slightly shrill sound quality is the presence of the .01uF Dynamicap in parallel with the Mundorf. I personally never bypass coupling capacitors because the bypass capacitor almost inevitably adds a hi-fi-ish sound that has a negative effect the sense of realism I seek. If you know how to do it, you might try disconnecting that bypass capacitor to see if you like the sound better. It's not needed, that's for sure.

I see that Madisonears essentially wrote the same thing, regarding the possible negative effect of the bypass capacitor in a coupling application. I agree with him.

Edits: 07/22/24

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