[Hallicrafters] "Different" 6146

[Rich Oliver]

A quick Google search on "FADF" will reveal that these tubes were 
specially made either for the "Florida African Dance Festival" or as 
part of a Syphilis detection kit.  Mystery solved!

That reminds me - I need to go talk with Dr. Wasserman.  No, not THAT 
Dr. Wasserman, the other one.

73, Rich

Glen Zook wrote:
> Although I have seen various versions of the 6146
> family of tubes, I ran into a couple yesterday that I
> have not seen before.  I am working on a transceiver
> that has problems in the final amplifier so I "pulled"
> the tubes.
> 
> These tubes are marked "made in USA" but have no other
> identifying marks on them except the letters FADF.  It
> took me a few seconds, but if you take the letters and
> change them to their equivalent numbers, then the
> tubes are marked.
> 
> A = 1
> B = 2
> C = 3
> D = 4
> E = 5
> F = 6
> 
> and so on.  Therefore, FADF = 6146
> 
> The internal structure looks pretty much like most
> 6146 family of tubes.  However, this particular pair
> of tubes is pretty unstable (like 6146B tubes can be
> in circuits designed for the 6146 / 6146A / 8298).
> 
> I am pretty familar with various versions of the 6146.
>  However, this particular version had escaped me until
> now.
> 
> 
> Glen, K9STH
> 
> Web sites
> 
> http://home.comcast.net/~k9sth
> http://home.comcast.net/~zcomco
> 
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