In one amp I use a Jennings vacuum contactor.
They are cheap on Ebay from time to time.
http://www.jenningstech.com/pdf/cont/rt1g.pdf
http://www.surplussales.com/relays/REVacRel-7.html
http://www.glvac.cn/products/VacuumSwitchTube/index_en.aspx
73
Peter
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of k7rdx
Sent: Donnerstag, 23. Juli 2009 18:43
To: Radio WC6W; dezrat1242@yahoo.com; amps@contesting.com
Subject: Re: [Amps] inexpensive HV fuse
Marv...Can you direct me to a roadmap for this type of device?I have always
used series resistance in the B+ of my YC-156 amps but lightning fast high
voltage cutoff seems a much better solution for tube&component
protection..73,Jim..K7RDX..
----- Original Message -----
From: "Radio WC6W" <wc6w_amps@yahoo.com>
To: <dezrat1242@yahoo.com>; <amps@contesting.com>
Sent: Thursday, July 23, 2009 8:41 AM
Subject: Re: [Amps] inexpensive HV fuse
Hi Bill,
The device I've proposed is located in the plate supply line between the
PS filter caps and the tube.
It is NOT on the primary side of the supply.
73 & Good morning,
Marv WC6W
http://wc6w.50webs.com/
--- On Thu, 7/23/09, Bill, W6WRT <dezrat1242@yahoo.com> wrote:
> From: Bill, W6WRT <dezrat1242@yahoo.com>
> Subject: Re: [Amps] inexpensive HV fuse
> To: amps@contesting.com
> Date: Thursday, July 23, 2009, 8:37 AM
> ORIGINAL MESSAGE:
>
> On Thu, 23 Jul 2009 08:24:24 -0700 (PDT), Radio WC6W <wc6w_amps@yahoo.com>
> wrote:
>
> >
> > Damage is avoided by shutting off the power,
> veryyyy quickly, rather than by shunting it.
> >
>
> REPLY:
>
> Nothing wrong with shutting off the PS quickly, but if you
> leave the filter caps
> charged, any damage from the B+ arc will involve much more
> energy than if the B+
> line were opened by a fuse and/or limited by a glitch
> resistor and/or crowbarred
> to ground.
>
> In other words, the quick shut-off should not be the only
> protection device.
>
> 73, Bill W6WRT
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
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