[Amps] doorknob cap suppliers ?

[Jim W7RY]

What is "that amp" ? The model is not mentioned anywhere in this cut down 
thread.

73
Jim W7RY



--------------------------------------------------
From: "Carl" <km1h at jeremy.mv.com>
Sent: Saturday, March 19, 2011 5:20 AM
To: "Robert Harmon" <k6uj at pacbell.net>
Cc: <amps at contesting.com>
Subject: Re: [Amps] doorknob cap suppliers ?

> If the RFP doorknobs are the standard CRL/HEC HH-58 size there is no
> difference between the 5 and 7.5KV versions except for the label. Both are
> conservatively rated and just the overhead margin is different.
>
> The weak link in that amp is the 160M switch contact to the frame screw as
> Ive mentioned earlier.
>
> Carl
> KM1H
>
>
> ----- Original Message ----- 
> From: "Robert Harmon" <k6uj at pacbell.net>
> To: "Carl" <km1h at jeremy.mv.com>
> Cc: <dezrat1242 at yahoo.com>; <amps at contesting.com>
> Sent: Friday, March 18, 2011 10:01 PM
> Subject: Re: [Amps] doorknob cap suppliers ?
>
>
> Carl,
>
> I hear what you are saying on higher voltage caps and yes it is cramped, I
> checked the available room
> and there really isn't any room for adding much larger caps.
> RF Parts has some ceramic doorknobs in stock that look suitable.  They are
> 2000pf at 7.5kv and they are about 7/8" in diameter. A pair of these
> conected in parallel would fit o.k.
>
> No steel or stainless, I am thinking of using 3/8" wide copper strap for 
> the
> doorknobs. I would love to find some
> silver plated strap like the plate strap is,  but maybe getting too 
> carried
> away.
>
>
> Bob
> K6UJ
>
>
>
>
>
>
>
>
>
> On Mar 18, 2011, at 1:42 PM, Carl wrote:
>
>> I see no reason to go higher voltage in that amp. Similar B+ level
>> products have been using the standard 5KV ceramic doorknob for many
>> decades. The antenna safety chokes are there for a reason and if there is
>> an antenna fault while transmitting saving the 8874's will be your major
>> concern....always monitor the grid current.
>>
>> With Russian caps you first need to have the room which is already
>> cramped, and metric brass or screws and washers....you arent going to use
>> steel or stainless are you?
>>
>> Carl
>> KM1H
>>
>>
>
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