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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: Hey Mikey - Three cheers for Russian K75-10 caps posted by banpuku on October 23, 2016 at 16:40:15:
I think it's interesting that one cap would be noiser than the other.
BTW 2.2uf seems like a very small size for a cathode bypass cap.I would think in most instances that only the high frequencies would be bypassed through the 2.2uf cap and there would still be local current feedback for the low frequencies.
That would shift the frequency response of the stage to accentuate the high frequencies. Kind of like a tone control.
There's a formula for calculating the value needed to cover the whole audio band.
It's complicated but I have it loaded into a spreed sheet. See link
Rp is the plate resistance of the tube at your operating point.
RL is the total load plate impedance (plate resistor in parallel with the grid resistor of the following stage).
RK is the value of the cathode resistor.
Mu is the Mu of the tube.
F3 is the -3db point of the filter.
It takes a decade to get totally out of the effects of the filter. So if you want 20Hz to be phase shift free then build the filter for 2Hz.
Most build for 3-5Hz.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 10/23/16
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- RE: Hey Mikey - Three cheers for Russian K75-10 caps - Tre' 17:08:22 10/23/16 (0)
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