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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Thanks, Tre ... posted by andyr on January 18, 2012 at 13:52:44:
"So can you tell me what the equation is for calculating the impedance of the Source?"
No, but I can tell you what the equation is for calculating the impedance of the cathode of a triode.
I think it directly relates but you will have to figure out how.
The "total" cathode impedance Zk is cathode resistance of the triode Zk` in parallel with cathode resistor Rk.
Triode cathode resistance is Zk`=(Rl+rp)/(mu+1)
Where mu is amplification factor and rp is anode resistance in concrete operating point. Rl is load resistance for AC, and this is anode resistor (in preamp stage) or reflected primary load of the OPT (Za) in output stage. Note that actual Rl can be Ra//Rg, or anode resistor in parallel with second stage grid resistor.
The final formula for Zk (Zk`//Rk) is:
Zk = (rp + Rl) / ((mu + 1 + (rp + Rl)/Rk)
And our capacitor for chosen -3dB frequency is:
Ck = 1 / (2Pi * f * Zk)
Tre'
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Follow Ups
- RE: Thanks, Tre ... - Tre' 09:20:41 01/19/12 (0)
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