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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: Where to find large value uf film caps ? posted by akltam on January 17, 2017 at 09:06:02:
Two points.
1. The -3db point would be 15.9Hz. That means the phase would be shifted all the way up to 159Hz. A -3db point of 2 to 5Hz is normal practice.
2. What needs to be bypassed is not the value of the cathode resistor, it's the value of the cathode resistor in parallel with the impedance of the cathode.
The formula, Cap value in Uf = 1000000/(6.28 * r * the -3db frequency you want)
r is the value of the cathode resistor (RK) in parallel with the impedance of the cathode (rk).
The impedance of the cathode is, rk = (plate load + plate resistance)/ (mu+1)
Tre'
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- RE: Where to find large value uf film caps ? - Tre' 22:40:29 01/19/17 (1)
- RE: Where to find large value uf film caps ? - akltam 10:18:53 01/21/17 (0)
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