From: David Lesher
Subject: Re: Digital divide by ten, 1949 style
Date: Mon, 23 Sep 2002 13:59:21 +0000 (UTC)
Organization: NRK Clinic for habitual NetNews Abusers - Beltway Annex
References: <3D84D4B3.50B511EF@webaccess.net> <3D850A3C.31381AD5@webaccess.net> <3D852DB5.2AEB8909@webaccess.net> <3D856710.79959F55@webaccess.net>
Reply-To: email@example.com (David Lesher)
NNTP-Posting-Date: Mon, 23 Sep 2002 13:59:21 +0000 (UTC)
Chuck Simmons writes:
>> No, 866, 866A, 866AX and 866 Jr. tubes were hefty half-wave mercury
>> vapor rectifiers with 2.5V filaments. The 866B had a 5V filament, as
>> did the 872.
>The 866 was not really hefty. Rather small as I remember and used in low
>power stuff. The 872 was fairly hefty but the 575 was definitely hefty.
Eons ago, we worked on RF heaters for a plastic dish plant. It was
a LC circuit; you put the pellet between the cap plates and ran it
for ~2 minutes. It was allegedly at some 27Mhz ISM frequency.
They had 3ph power and six 866* MV rectifiers. These ran a ?572? ?527
or some close # metal RF triode. Pricy -- several hundred bucks.
This was the factory OSHA never found; if they had, they'd have
bulldozed it on the spot. More than once we'd show up and find the
reason things were down was one leg of the 3ph was dead in half the
place. The alleged maint. man would wad paper into the overload relays
so that when a 866 flashed over, the transformer on that leg would
We would freak out the line workers by starting the unit and holding
a 8' fluorescent tube in front. As you slide the tube along, the
part lit would travel along it...
For some reason, there was a notable lack of CB antennas [Hey, I said
eons ago..] in that area.