Hi Ed:
I checked optically, using an Ohmmeter and using the Diode Test function of a
Fluke 87 DMM. It's an inductor.
I share your concern as to how 11 GHz signals come from tube equipment with
point to point wiring.
--
Have Fun,
Brooke Clarke
https://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
axioms:
1. The extent to which you can fix or improve something will be limited by how
well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.
-------- Original Message --------
That's an interesting unit. You may want to take a close look at the small axial-leaded component going from the tube
socket pin 7, to the B+ feed-through cap adjacent the "C18" label on the chassis. It appears you have it as a choke in
the schematic, but I believe it's a diode - specifically, a step-recovery one. Our old friend the SRD shows up in a
lot of places. You can at least check to see if it's a diode, and intact.
That would also explain how a "regular" pinned tube and socket combo can provide any meaningful power output to 11
GHz. If it was an acorn or lighthouse tube or something like that, I could picture it, but I'd say the tube is just
pumping the 50 or 100 MHz into the SRD, which is doing the multiplying. The RF current path would be through the SRD,
the feed-through cap into the chassis, then to the output tank, then back to the socket pin via the stout cap, which
looks like a solder-in type feed-through rigged for coupling - almost as good as a leadless cap.
Whatever you do, be careful while poking around in there. With the diode hanging off B+, a simple shorting mistake
could take it out.
Good luck.
Ed
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