[Collins] 32S-3 caps C72, C76

[James Liles]

Good afternoon Jerry:

I believe you are correct.  The Coupling cap in the SR-150/SR-400 were RMC 
1nf, 3kv 20% that test to be X5U.  They are linear and stable changing only 
4pf/100 volts to 600v.  I believe the AC voltage across that cap will not 
exceed 100 volts so an X5U would be a good choice.

Kindest regards Jim K9AXN



-----Original Message----- 
From: Dr. Gerald N. Johnson
Sent: Friday, May 04, 2012 9:25 AM
To: collins at mailman.qth.net
Subject: Re: [Collins] 32S-3 caps C72, C76

My most rtecent manual shows those capacitors are part number
858W5T2KV1KPFPORM20PCT 1nf, 2 kv, 20% CPN 913-4803-000 made by v72982,
looks like Centralab. A transmitting capacitor 13/16" diameter 5/8"
long, with 6-32 threaded posts. Hi-K dielectric according to the 1960
Radio Electronic Master. Centralab catalog 101 shows X5U maximum C at
room temp, down 20% at -25C and +50C. Probably like (CFC) HT581000-75 at
Surplus Sales or RF Parts. A disk ceramic may function electrically but
loses the mechanical support of the Centralab 858 capacitor.

HP says federal manufacturing code 72982 is Erie. And my 1960 Master
doesn't show any erie transmitting capacitors.

73, Jerry, K0CQ, Technical adviser to the Collins Radio Association

On 5/4/2012 8:01 AM, Carl wrote:
> Generic Hi-K of the 50's which was long before todays definitions were
> developed.
>
> Any 1000pf/6KV disc will be fine.
>
> Carl
> KM1H
>
>
> ----- Original Message -----
> From: "Bob and Sue Jefferis"<ljranch2010-ham at yahoo.com>
> To:<collins at mailman.qth.net>
> Sent: Thursday, May 03, 2012 9:57 PM
> Subject: [Collins] 32S-3 caps C72, C76
>
>
>> Greetings all,
>>
>> I have been looking for definitive specifications of the "Hi-Q" brand
>> ceramic disk caps used in the 32S-3 for C72 and C76. The KWM-2 used the
>> same caps in the PA area, e.g. , C149. These are 1000 pf 2 kV ceramics. I
>> have not found a Federal Stock Number for these guys either. Before
>> attempting to order replacements  I would really like to know what the
>> original dielectric characteristic was. Any insight?
>>
>> 73, Bob. KF6BC
>>
______________________________________________________________
Collins mailing list
Home: http://mailman.qth.net/mailman/listinfo/collins
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Collins at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html