[Boatanchors] 211H differences

[Chuck McGregor]

The 1945 Amperex sheets in Radio's master indicate the "Type 211H fully
interchangeable with Amperex HF-150"  and also " Type 211C fully
interchangeable with Amperex HF-130".  Unfortunately no detailed spec's
given.  Possibly the 211H and 211C had higher plate dissipation ratings
than the plain 211 ?     Same note repeated in 1950 edition, with no
further information.

73,
Chuck K7MCG

On Sat, Jan 26, 2013 at 1:07 PM, mac <w7qho at aol.com> wrote:

> 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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