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Triode Calculator
Thursday January 5, 2006 by adam
The equations for this circuit are taken from "Designing Common-Cathode Amplifiers":http://aikenamps.com/CommonCathode.htm, by Randall Aiken.

Tube Data

 Results

Choose from the menu at right to fill in Ra and mu values for some common triodes.

  Bypassed Unbypassed
Voltage Gain
Decibel Gain
Ra
(internal plate resistance)		 Plate Output Impedance
mu
(amplification factor) 		Cathode Output Impedance
Circuit Data Schematic
Rp
(plate resistor)

Rg
(grid load)
Rl
(following stage impedance)
Rk
 (cathode resistor)

 
 

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  1. hey adam,

    let me rephrase my questions.

    all i need to know is what do i plug in, when using your calculator, for Rp and Ri when the triode is in the output position?

    thanks man!


    — SG    Mar 4, 03:31 PM    #

  2. Adam, great triode calculator! My question is about bypass caps and frequency, like when I bypass my 2.7k Marshall with a .68uF versus a 25uF, where are the frequency curves?


    — Doug    May 3, 10:17 AM    #

  3. I agree I love this tool but I would like to know the frequency response of coupling caps. if you combine this with the current tool it would be awesome. I understand that impedance plays a factor too.


    — Sam    Mar 3, 05:47 PM    #

  4. What B+ voltage are you using. My understanding from reading tube specifications is this also effects the total gain.
    Thanks,
    Terry


    — Terry    Oct 31, 09:04 AM    #

  5. Caps by themselves don’t have a ‘freq response’..they have a capacitive reactance, Xc = .159/(F x C). When coupled with a resistor, the key freq point, -3dB, is where Xc = R, or
    F =.159 / (R x C)...other factors make this a close approximation.


    — Pat    Nov 20, 05:11 PM    #

  6. Hi ! There is something wrong with this calculations . In reality the gain changes with different cathode resistors , even when bypassed .


    — Thomas    Jan 18, 07:10 AM    #

  7. Great Site and Triode Calculator. I was wondering sould there be a place to enter the B+ ? when i do my calculation the B+ is a factor to.


    — Eddie P    Aug 3, 09:41 AM    #
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