Quote:
Originally Posted by specialty guitars
With effects and all that in line, it's all the same. The resistance to ground is still there, so the circuit is fine.
With all of the circuit changes, layout and other design differences, etc. between the vintage GA5 and this new one, the likelihood that the lack of a grid return resistor could be an accidental omission, carried over from the 50s to this new design, is less than infinitesimal.
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Strangely, Gibson did this on some amps but not others, i.e. the GA-6 had no pull down resistor yet the GA-40 and others did. The other advantage of having a 1M resistor in there is the improvement in signal to noise. It was how Leo did it and it is how everyone else still does it to this day and beyond.