In order for the gains to be equal, it is customary to use different values of plate resistance.
2.
It is one of the three'constants'of a vacuum tube, the other two being its gain ? and plate resistance R p or R a.
3.
Mathematically, the gain of the phase inverting stage is given by the product of the amplification factor and the load impedance divided by the sum of the plate resistance and the load impedance.
4.
The pair of tubes produce outputs exactly out of phase, but the gain of the grounded grid amplifier is slightly higher, requiring that their plate resistances be different in order to maintain balance.
5.
The gain of the in phase stage is given by the product of ( one plus the amplification factor ) and the load impedance divided by the sum of the plate resistance and the load impedance.
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