[Boatanchors] 211H differences

[mac]

The 211 was an early power triode that came in multiple flavors from  
multiple manufactures,  Amperex, Cunningham,  National Union, RCA,  
Taylor, United Electonics and Westinghouse according to Sibley. The  
211H (AKA  HF150) would appear to be the Amperex contribution to the  
mix.  The most common  211 variant would probably be the VT-4-C  
manufactured in LARGE numbers during WW2, mostly (?) by GE but also by  
others (I have a pair of Amperex VT-4-Cs).  According to Sibley the  
VT-4-Cs also carried a "211 Spl" designation and was a 211 with "low  
grid current limits" (?).

Probably no practical difference between the 211H and other 211 types  
and variations.  Word the description right, though, and you might get  
a lot more for them on e-Bay.  :^)

Dennis D.  W7QHO
Glendale, CA

**************
On Jan 25, 2013, at 9:42 PM, Robert Goff wrote:

> Greetings,
>
> Does anyone know offhand the difference between an Amperex 211-H tube
> and a regular 211-say General Electric type?  I pulled up the data
> sheets and they seem to be about the same, but looking at the 211H the
> plate structure seems like its coated with something.
>
> Just saved a box of four of these Amperex tubes, NIB from the dumpster
> at a house "clearing."  Usual story-OM's got alzheimers, kid's not
> interested in radio-so out it all goes.  We did manage to save a few
> things, though.
>
> 73,
> Robert
> W7MKA
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