Date: Wed, 19 Feb 2020 09:28:37 -0600
From: Jim <jimw7ry@gmail.com>
To: amps@contesting.com
Subject: Re: [Amps] Kilovac relay in MFJ 2020 catalog
<Depends on how fast the relay is. Just because its vacuum, doesn't mean
<its fast!
<I use solid state relays for cathode switching now days. Works great.
<73
<Jim W7RY
## an opto isolator works, along with its 4 kv isolation. Problem is,
I typ
use 60-120 vdc OCV for the sped up 26.5 vdc vac TR relays.... + drop
resistor..+ small cap across drop resistor. Kilovac told me years
ago, that
if voltage limited,, like only 24 –27 vdc available, use vac relays
with 12 vdc coils.
## Buddy and I managed to speed up a gigavac G2.....same as a jennings
RJ2B.
Rated for 15 msecs operate...and 9 msecs release. Sped up, with 80
vdc
and a .5uf cap across drop resistor, they become 2.5 msecs
operate..and rls.
2nd G2 was 2.7 msecs operate and rls. 26.5 vdc rated coils.
## Both G2s were individually tested on bench. Then installed in GG
triode amp,
on output side, with all contacts in parallel. Fast enough for QSK,
and good for
20A CCS at 32 mhz.
## Ameritron sez their kilovac relay can be used in QSK. Dunno how u can
do that
with a DPST relay. Normally a DPDT is used... or a SPDT on both input +
output.
## I might buy one....just to test on the bench....since they are
cheap.
Jim VE7RF
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