[BC] Test Your Wits on This

[Burt I. Weiner]

I suspect it has a lot to do with the tube's geometry, whether 
internal elements or external such as lifting handles.  Many of these 
things can affect the distributed capacitance among circuit 
components.  Very small reactances can make big changes when 
neutralizing a circuit at these frequencies.  Some of these "stray" 
reactances could easily change the range of normal adjustment thingies.

I seem to remember a long time ago seeing a reference as to how to 
orient a 4CX5000 tube in an instruction book.  Well, actually in the 
transmitter, but it was noted in the instruction manual.

Burt

>
>On Mon, Feb 27, 2012 at 5:46 PM, Dave Dunsmoor <mrfixit at min.midco.net> wrote:
>I have no absolutely idea why I tried reorienting the tube in the socket,
>but when I did, the RF neutralization value dropped to under 10 watts.
>
>By then making small adjustments in the tube's orientation, I got the
>value down to practically nothing, and got the rig on back the air shortly
>after 5 AM.
>
>Richard Rudman