[Amps] GigaVac GH3 Vacuum Relays

[Paul Christensen]

Larry,

Thanks for the link to the comparative table.  I see now that the GH3/GH5 
are not rated for RF.  Looks like the GH1 through Henry Radio is still a 
good buy at about USD $50 ea., although out of stock at the moment.  Tnx!

Paul, W9AC

----- Original Message ----- 
From: "Larry Benko" <xxw0qe at comcast.net>
To: <amps at contesting.com>
Sent: Friday, January 07, 2011 9:24 AM
Subject: Re: [Amps] GigaVac GH3 Vacuum Relays


>  You might want to get your info from the "real" source.
>
> http://www.gigavac.com/products/relays/datasheets/gh1_3_5/index.htm
>
> They are NOT even close to the same relays.  You draw your own
> conclusions but I am pretty sure the GH3s are SF6 gas filled and not
> vacuum which is why they are NOT rated for RF service.  Both have
> tungsten contacts which is what allows them to be hot switched.  Copper
> contacts are much better for non-hot switched apps. because the copper
> has lower resistance and heat is the enemy at high current.  However a
> couple of hot switches and the copper contacts are ruined.   Relays that
> are SF6 filled have actually better inrush capabilities than vacuum
> relays but are not usable at RF.
>
> See http://www.gigavac.com/apps/relays/physics/index.htm
>
> Larry, W0QE
>
>
> On 1/7/2011 6:31 AM, Paul Christensen wrote:
>> Searching for the GigaVac GH1 relay, I found that Henry Radio has the 
>> 26VDC
>> GH3 version of the GH1 for only USD $39.95.
>>
>> http://store03.prostores.com/servlet/henryradio/the-Henry-Amplifier-Repair-Parts/Categories
>>
>> Apparently the GH3 is load-switch rated, and supposedly able to withstand
>> accidental hot-switching events better than the GH1, Jennings RJ1, and
>> Kilovac counterparts.  GH3 open&  close switch times are comparable with 
>> the
>> GH1.
>>
>> Anyone have experience wit the GH3?   Do they switch as quietly as the 
>> GH1?
>> At USD $40 ea. for the 26VDC version, that's quite a value.
>>
>> Paul, W9AC
>>
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