[AMPS] Cathode Lifetimes

[Radiodan W7RF]

And we could get Rich to edit it, ........ except the chapter on VHF
parasitics!

I remember all those "GE HAM NEWS" from the 50's (before my amateur or life
time, but I read them just the same), in fact I built a design for a pair of
813's in the 70's.

73, Dan Magro W7RF, (President WARC 1999, member SCDXC, SCCC)
Manufacturers Rep & Distributor for HENRY RF Power Amplifiers.
RF Applications Power Measuring equipment, See the VFD & WinWatt!
www.radiodan.com <http://www.radiodan.com>     RFpower@radiodan.com
<mailto:RFpower@radiodan.com> A trip to our web site is worth the click!




> -----Original Message-----
> From: owner-amps@contesting.com [mailto:owner-amps@contesting.com]On
> Behalf Of Hans Goldschmidt
> Sent: Sunday, October 31, 1999 10:30 PM
> To: Pat Barthelow; amps@contesting.com
> Subject: SV: [AMPS] Cathode Lifetimes
>
>
>
> Hej!
> For long tube life you have better read EIMACs application note
> how to treat
> your tubes, burn-in, how filament voltage affects life etc. By the way:
> would it not be wonderful if the EIMAC people could bring all
> their old/new
> application notes into a little booklet? How about it W6SAI? Or even
> better:if someone could scan in on a CD all the long forgotten articles on
> linear amplifiers from wonderful HAM RADIO, CQ, RADIO HANDBOOK,
> QST and all
> transmitting tube data sheets from EIMAC and RCA. The wonderful
> ARRL SINGLE
> SIDEBAND HANDBOOKs not to be forgotten. You can find there the answers  on
> many of the questions asked on this reflector.
>
> HAM RADIO  had through the years not only outstanding articles on linears,
> but so much more on other subjects. So, now when you can get all
> the old QST
> magazines on CD roms, why not do the same with HAM RADIO no
> longer avaiable
> to newer hams?
>
> Hej daa de Hans SM5KI.
> ----------
> >Från: Pat Barthelow <aa6eg@hh.tmx.com>
> >Till: amps@contesting.com
> >Ämne: [AMPS] Cathode Lifetimes
> >Datum: mån 1 nov 1999 00.39
> >
>
> >
> >
> >
> >What is the expected hour lifetime of a typical thoriated tungsten
> >filament tube like the 3-500Z?  Assuming no operator
> >abuse/mistakes/parasitics, etc, is
> >there a mechanism for the tube going flat (showing reduced output) simply
> >from old age/use?  If there is an operational old age for cathode
> >emission, does the clock tick if the tube is lit, but no current flows?
> >
> >
> >73, DX, de
> >Pat, AA6EG/N6IJ;
> >aa6eg@hh.tmx.com;n6ij@hotmail.com
> >599 DX Drive, Marina CA 93933
> >See us on the web: www.polkinghorn.org/n6ij
> >"The Contest Station from the Government"
> >
> >
> >--
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> >
> >
>
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>


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