On Sun, 11 Apr 1999 16:34:05 -0500 Jon Ogden <jono@enteract.com> writes:
Well, this may be true, but my input circuits are not at the cathode
>pins. What I do have though are series RC networks from cathode pins
>to
>ground. Perhaps the 4-1K wants to see some capacitance to ground on
>the
>filament pins in order to be stable. What you did or what I did
>accomplishes it.
>
>73,
Drake and Sigma used small caps to gnd from the filament pins of their
3-500 amps. Dont know if it did anything useful.
All my old GG 4-1000 amps used either direct cap input coupling or simple
pi nets right out of the Orr Handbook.
Grid driven used a 200-400 Ohm swamping resistor and a balun. Yes balun
materials were available in those ancient days! OT's will remember Arnold
and others.
In the 1963-70 era drive was abundant and IMD was just starting to get
respect.
73 Carl KM1H
Well fed after going to a real Greek Easter banquet with a whole lamb on
the spit, etc. Ate enough for a week.
>
>Jon
>KE9NA
>
>
>-------------------------------------
>Jon Ogden
>KE9NA
>
>http://www.qsl.net/ke9na <--- CHECK IT OUT! It's been
>updated!!!!!
>
>
>"A life lived in fear is a life half lived."
>
>
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>
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