Amen - and what about Finnigans Antenna Wax? Rub it on your favourite yagi and
get an
extra dB of gain and lower QRN!! I joke not, some character here did a roaring
trade for
a few years selling it to the locals.
John ZS5JF
----------
> From: John Lyles <jtml@lanl.gov>
> To: amps@contesting.com
> Subject: [AMPS] misc topics
To: <amps@contesting.com>
> Date: 18 March 1999 08:03
>
>
> Thoriated Tungsten tubes were used in a lot of broadcast radio transmitters
> from the 50's to the present age, as they had reasonably long life, and
> could be termed 'instant on'. In a line of FM transmitters using the Eimac
> line of power tetrodes, Broadcast Electronics set the filament warm up
> timer to be adjustable for 10-60 seconds I think, before HV could be
> applied. I remember the discussion with the engineers at Eimac, and we
> could have shortened it a tad, but we were conservative. When there is a
> power outage (brownout), the thing is set to ignore the filament timer and
> slam the HV back on as soon as bias is up, then follow with screen voltage
> -assuming that this happens infrequently (during an electrical storm for
> instance) and that the owner doesn't want to loose air time waiting for the
> silly filament timer again. If the power was out for over a certain
> duration, then the filament timer would reinitiate. Thats how we handled
> that. Indirectly heated - oxide- cathodes are rarely used in those types of
> rigs. (did use the 8877 at 1500 watts FM, as it was such a good part for
> 100 MHz).
>
> My SB220 is about as fast a warm up as I care to see. Nothing like a pair
> of 3-500Z or 3-1000 for fast heat.
>
> Speaking of which, I read something about painting the insides of the SB220
> RF compartment with black shoe polish. Is this some kind of cult that I am
> missing out on? I love these. (I'm sure there must be a thermal reason that
> one of you will explain to me, although I have been very satisfied with my
> stock SB220 cooling, except for the day that the fan froze up while I was
> on standby).
>
> I remember when CD's were being challenged by the purist audiophiles,
> someone came up with the idea that if you cleaned them or rubbed them with
> some magic goo, then they 'digital grundge' would be remedied. So various
> charlatans sold CD polish and CD solutions, that would dampen the
> vibrations of even the cheapest CD players, and improve the sound. One of
> them was to be smeared around the edge of the compact disc. I better not
> continue on this, because I'll start talking about the Kinergetics company,
> and their little black modules which would cancel out the 'hysterisis'
> effects of transistors, capacitors, solder, and even chassis wiring. They
> had an inverse-sounding block for all of those horrible sounding electronic
> components in their stereo componentry. You should see the letter I sent
> them in the 1980s and their presidents reply to me!
>
>
> Ta Ta,
> John
> K5PRO
>
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