Hello,

Chuck Harris wrote:


Pin 1 and pin 7 probably connect to opposite sides of the screen. Perhaps
the inductance of this connection creates an opportunity for a VHF parasitic
resonance, and the 100 ohm resistor is there to dampen it out?

Yes, this can be the reason, thanks for the hint!
Probably is anyway a good thing to add similar resistors in a home made
tube linear.

73

Francesco IS0FKQ