Hi Joe,
These were used, six in parallel, in the clock driver for a mainly solid state
Univac III. Whenever the field service folks had any kind of problem, they
replaced all six and put the removed ones in a box for me! They were usually
good and I had
six, two, and 432 amps that used them. They were later replaced by a single
4cx1000 and I got several of those in my box also.
The tape drives also had large mercury vapor tubes (866??) that glowed as the
tapes ran.
Neat stuff!
Regards,
Richard W5SXD
"Joe Brown" <joe.brown@gordmans.com> wrote:
(12/24/2008 23:45)
>Hi Richard,
>
>Please tell me, how were 4cx250b tubes used in the computer service back
>then? My computer career didn't start until the mid 80's.
>
>73, Joe W0DB
>
>
>-----Original Message-----
>From: towertalk-bounces@contesting.com
>[mailto:towertalk-bounces@contesting.com] On Behalf Of richard allen
>Sent: Wednesday, December 24, 2008 11:15 PM
>To: towertalk@contesting.com
>Subject: Re: [TowerTalk] lines into trees
>
>Many years ago in the 1960's I had a box of 4cx250b tubes that had been
>pulled from computer service. I would tie a piece of strong lacing cord
>around the anode and swing it around and release it in the direction of
>the treetop. I then pulled the
>antenna up with the cord. A rather unique use of a great power tetrode.
>
>
>Richard W5SXD
>
>
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