AW: [time-nuts] Strange effect with C-Field change -- and a bit ofdata

John Ackermann N8UR jra at
Sun Mar 27 13:56:57 EST 2005

Brooke Clarke wrote:

> John:
> Can you tell if just a raw tube was installed in you HP or is there a 
> printed circuit board on the tube? A photo might be worth 1,000 words.

The retrofit kit is just the tube plus mounting hardware (it's 
physically quite a bit smaller than the HP tube).  There's no additional 
circuitry, and no electrical changes to the HP chassis, other than the 
several tube-specific components that you need to change to adjust oven 
temperature and C field centering, etc. (just like you need to do when 
changing HP tubes).


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