interesting-this days I was occupied with solving one simple problem:
due to power blackouts (especially really short ones) internal automatic
switch (more sort of automatic fuse-40A) of our tube transmitter (99.1 MHz
,2.5KW) is often clicked down.
problem is-(hehe) xmitter is just 15Km from studio.
powering cycle is pretty normal-90 secs of 5A from 220 main (just
heating),then 17A when 2700V is clicked.
but in moment of short outage,thingie like to pull more than 40A from
wall,just because Ht relay circuit is too slow for off state.
after some thinkin',I just use one greeeeeesy 3phase contactor via Omron
programming delay relay.
catch is-I wire contactor to take his own coil via "working" accessory
contacts and delay relay is wired through "steady" contacts.
so,relay just give initial impulse to contactor coil,then is ( delay relay)
switched off when lifter goes down (down to "on" position) .
so ,when you power up delay circ-delay relay after 5 secs give power to
lifter's coil,then stays without power;
durin' blackout-lifter goes up (switching off bloody xmiter) ,just then
delay relay again is on power line-after 5 secs he gives impulse to lifter's
coil etcetc.
I must make something similar (just smaller) for my home tube gear.
hehe-this wooden box with "anti blackout circ" and main filter and voltage
meter will be biggie............

--
Choky
Prodanovic Aleksandar
YU


"TubeGarden" wrote in message
...
Hi RATs!

Slow only on initial power up after period of rest.

If you get a brief power outage, all goodness and purity are lost.

Here in AZ, power outages are never brief, so, No Problema!

If you really want B+ to behave, install separate switch with a relay to
open
if power drops.

Remote control is optional. Think of it as a sport, and, go for the Gold!

Happy Ears!
Al


Alan J. Marcy
Phoenix, AZ

PWC/mystic/Earhead