Question here for Richard and his wealth of experience, with all welcome
to comment of course;

Does the capacitor bypass techniques described in:

http://www.bunkerofdoom.com/lit/zener/index.html

,have a useful improvement in rf amplifier imd, or have any merit in
your opinion?

I took your advice on 10 ohm cathode resistors (unbypassed) in a cathode
driven sweep tube amp here, and 40m imd performance was substantially
improved.

Thanks for the sb220 improvements also, very beneficial on a HL2200 I
had in the past.

73

Adrian

vk4tux