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R5 and R7 couple the ac current from driving the primary into the cathode of the tubes. This makes the voltage on the cathode of the tube change less and thus the tube will have a Rp closer to having a voltage source on the cathodes.

R5 and R7 also causes any cap on the cathode to behave like a larger value.

Note: When paralleling tubes, the plates can be tied at dc if the cathodes are not directly dc coupled. The cathodes can be tied at dc if the plates are not directly dc coupled. This was explained at VSAC 1999?



Play safe and play longer! Don't be an "OUCH!" casualty.
Unplug it, discharge it and measure it (twice) before you touch it.

. . .Oh!. . .Remember: Modifying things voids their warranty.

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