Hi,

The Ohmite rf chokes you mentioned were characterized
by their design frequency. E.G., the Ohmite Z-50
and Z-144 were intended for 6 and 2 meters. The Collins 30L-1 linear
(4 ea 811A's) used an Ohmite Z-14 for its plate choke.

I have some Ohmite Z-1 chokes which should be good
for a 160m amplifier, although they were designed
for broadcast band use. (Does anyone have the "official"
specifications for these?)

73,
Ed Knobloch


Tim Shoppa wrote:
I'm fixing up some older ham transmitters. 811 or 6146 finals, etc. in
the 50-200 watt class.

snip

6146/811/sweep tube handbook construction articles from the 50's show
similar RF chokes in their circuits and part numbers like "National
R-100" and "Ohmite Z-214".

snip