[Boatanchors] AMPERITE 6-4 BALLAST TUBE

[W4AWM@aol.com]

<<I came across a Amperite 6-4 ballast (octal base) tube. Can anyone decifer 
the   "6-4" meaning?>>

The number indicates the approximate current-threshold value.  In this case, 
the 6 indicates a threshold current of 0.6 and the 4 indicates a threshold 
voltage of 4.0.  If ah "H" is present in the number, ie: 6H4, then the 
threshold current is 0.5 higher or in this example, 0.65

<<Is its primary purpose filament surge? >>

There are a number of uses for ballast tubes.  Any number of tubes may be 
wired in parallel, but Amperex says that their ballast tube is not for use in 
series circuits. Its use is to automatically regulate the current to a 
constant value consistant wih the parameters of the tube.

73,  

John,  W4AWM

 


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