[Amps] inexpensive HV fuse

[Jim W7RY]

The ones shown on the Surplus Sales site are very reasonably priced! And the 
are nice and small too.

73
Jim W7RY

----- Original Message ----- 
From: "DF3KV" <df3kv at t-online.de>
To: <amps at contesting.com>
Sent: Thursday, July 23, 2009 10:03 AM
Subject: Re: [Amps] inexpensive HV fuse


> 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 at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of k7rdx
> Sent: Donnerstag, 23. Juli 2009 18:43
> To: Radio WC6W; dezrat1242 at yahoo.com; amps at 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 at yahoo.com>
> To: <dezrat1242 at yahoo.com>; <amps at 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 at yahoo.com> wrote:
>
>> From: Bill, W6WRT <dezrat1242 at yahoo.com>
>> Subject: Re: [Amps] inexpensive HV fuse
>> To: amps at 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 at 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 at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>
>
>
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