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I just played with nick's online tool ( http://bmamps.com/ivds.html ) and "misused" it to find the idle plate current with different supply voltages (2x6L6, Vp=Vs=400V, Vg1= - 45V).
I found that Ip increases by 10% if both grid bias and screen voltage are increased simultaneously by 10%. This shows that the screen voltage effect somewhat dominates the grid bias effect.
The influence of plate voltage on Ip is insignificant, but if plate voltage also increases by 10%, plate dissipation will rise by 20%.
Relations may differ with cathode bias or class A operation.
I found that Ip increases by 10% if both grid bias and screen voltage are increased simultaneously by 10%. This shows that the screen voltage effect somewhat dominates the grid bias effect.
The influence of plate voltage on Ip is insignificant, but if plate voltage also increases by 10%, plate dissipation will rise by 20%.
Relations may differ with cathode bias or class A operation.
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