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I am studying the schematic and noticed that the earlier 25MC30 chassis used a 270K resistor on grid 1 (pin 1) of the 6EW6 burst amp tube and the later 25MC33 chassis switched to a 150k resistor. Thoughts on the design reason for the slight change?
For reference these two chassis are probably 99% identical, my chassis is stamped 25MC33 but must have been an early one as most of the changes for the later chassis are not present on my chassis to include it using the early design 270k resistor.
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