[TenTec] 425 Titan vacuum relay

[Jim Brown]

Ten Tec was using two very different vacuum relays in the days when they 
built 425s and Herc IIs.  One is a Jennings RJ1A-26S, the other a Kilova 
(don't recall the number).  They are physically very different, and 
require a different circuit board.  Both types are made by Gigavac, 
which is what Alpha currently uses.  They are perfectly interchangeable, 
and I've been using the Gigavac relays for at least five years.  I do a 
lot of CW contesting, and they hold up quite well.  Make sure you get 
the right voltage -- the 425 uses a 26 VDC coil.  There's also a 12V 
version.  MaxGain Systems sells both Jennings and Gigavac. The Gigavac 
number for the RJ1A is GH1.

http://www.mgs4u.com/RF-Microwave/vacuum-relays-SPDT.htm

It takes a bit more than an hour to change the relay.  It's located 
right behind the output SO-239 connector on a circuit board.

73, Jim K9YC

On 12/14/2012 7:30 PM, Harry Coates wrote:
> Hello to all,  Got an easy question.. Been all thru the manual, and can’t find the type of vacuum relay used in it.. When I switch to “Operate” the RX signal goes away most of the time.. Then, if I put out a little signal for tune up the RX signal comes back, and all is fine after that.. I’m just suspecting vacuum relay contacts??
> I can use it as is..
>
> I have a spare relay for my Hercules II, and hope the 425 might use the same one.. But, before I take it of service or call TT, I would like to make sure I have the right relay on hand..      HEY, I worked SCL “Santa Claus Land” yesterday on 20M RTTY,    HO HO HO       “TEN TEC FOREVER AND RTTY TOO”
>
> Merry Christmas to all and a HNY
>
> 73,
> Harry N Coates
> WA8HC1 at charter.net
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec