[time-nuts] Strange effect with C-Field change -- and a bit of data

Chuck Harris cfharris at erols.com
Sat Mar 26 23:14:02 EST 2005

I remember reading an advertisement from FTS many moons ago that said they
had for sale higher quality replacement tubes for 5060's, 5061's, and 5062's.
Your replacement tube is most probably one of those tubes.

Remember, FTS was a direct competitor for HP's line of C-Beams, and as such they
coveted all aspects of HP's C-Beam market.


John Ackermann N8UR wrote:
> I did some testing today and I think that strange effect I saw was in 
> fact a cable problem -- I couldn't reproduce exactly the same effect, 
> but in gently wiggling one of the cables to the counter I was able to 
> get some oddball readings.
> A couple of unrelated points -- I wasn't sure about this, but have 
> verified that the FTS tube installed in my 5061A has the same C field 
> sensitivity (8x10e-14 per minor division) as the original HP tube.   
> And, having now seen the FTS instructions for retrofitting their tube in 
> the HP chassis, I can verify that the Zeeman frequency for the FTS tube 
> is supposed to be 42.82kHz.
> John
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