[Milsurplus] USN: ARB receiver used with GP-7 transmitter?

[Mike Feher]

Mike -

Interesting about the prediction made on tube filament physics. I would
never have expected that the filament resistance would decrease as a
function of use, rather, the opposite. 73 - Mike

 
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-901-9193


"Reports from the 
field indicate a high percentage of vacuum tube failures."  There 
follows a general blaming on improper handling of the tubes.  They then 
make an interesting statement: "The filaments of 6AK5 tubes have the 
unusual characteristic of decreasing in resistance with usage.  
Consequently, if these tubes are not replaced in pairs, the tube with 
the most operating time will have lower filament resistance and cause 
excessive filament voltage to appear across the new tube, with 
consequent failure."  Who'd a thunk?

73,
Mike

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