Resist!

So Johhny tried some 450 ohm copper resistors under his 75TL's and liked what they did so he asked for some 600 ohm versions for under the RS242 driver.

For the earlier 450 ohm versions I did both inductive and non-inductive wound versions and the non-inductive versions were preferred.  The interesting side effect of the non-inductive winding technique is a  bit of shunt capacitance but since the cathode R is bypassed, I say the more the merrier.