[Milsurplus] correction - - -416Bs and cavities

Thu, 25 Apr 2002 20:43:52 -0400

Can someone answer the guy's question or not? We all know what a 416B is.
That was not the question. What does he have, was the question. I do not
know, and I was using 416s 40 years ago. 73 - Mike

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

----- Original Message -----
From: "aGEnuine ham" <[email protected]>
To: <[email protected]>
Cc: <[email protected]>
Sent: Thursday, April 25, 2002 8:21 PM
Subject: Re: [Milsurplus] correction - - -416Bs and cavities

> Jack:
>
> Back before microwave solid state became a reality, the best receiver you
> could build and keep operating in a commercial circuit was a low noise
> diode mixer followed by the best gol-danged IF you could manage.  WE did
> that for the first TD-2 microwave by using the 416Bs in the wideband IF,
> and used the same approach in much of the microwave (& radar) gear they
> built in the 50s.  As H. O. says, the tubes were much sought after for
> ham VHF and UHF front ends, and even Nems-Clark used one in a tunable V/U
> receiver of the time.  Garden variety FETS beat them hands down now, but
> at the time they were prized possessions by the lucky few who could trade
> for them from a telco friend, or were among the top scroungers in MARS.
> One reason so many disappeared is they have a significant amount of
> recoverable gold plating which made the gold bugs grab them up faster
> than hams.  Spec's appear in many publications of the 50s, including ARRL
> handbooks, CQ and QST, and probably in the new Tube Lore book devoted to
> post '47 WE tubes.
>
> George,
> W5VPQ
>
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