[R-390] Ceramic .01 bypss buy

[Les Locklear]

In a Hammarlund SP-600, the cap of choice is the ceramic, especially inside 
the turret assemble.

Yes indeed, it is a silly question.

Art never chose what type of capacitors they (Collins) used, the engineers 
did.

Les Locklear
Monitoring Since '57
Located On the Gulf of Mexico
Gulfport, MS.
http://www.hammarlund.info/homepage.html

----- Original Message ----- 
From: "Tim Shoppa" <tshoppa at wmata.com>
To: <r-390 at mailman.qth.net>
Sent: Tuesday, May 09, 2006 10:04 AM
Subject: Re: [R-390] Ceramic .01 bypss buy


> Perry wrote:
>
>> I'm starting to buy parts for my BA rebuilds.  I plan to buy either
> 500
>> or 1,000 new Vishay .01 1KV ceramic bypass caps from Mouser to
>> relace BBOD's in R390s and SP 600's.
>
> Silly question, but: What possible effects could there be in replacing a
> plastic-wax-foil type capacitor (BBOD) with a ceramic?
>
> Certainly elsewhere in the 390A (esp. RF deck) there are plenty of 0.005
> ceramic bypass caps.
>
> Ceramics seem to have substantially less winding inductance but perhaps
> substantially larger voltage-dependence in dielectric (I'm guessing that
> a 0.01 1kV unit would by X7R or Y5P dielectric.) In bypass use it seems
> unlikely that the funky X7R or Y5P dielectrics would have a lot of bad
> effects but...?
>
> Or: why did Art not use ceramics to begin with?
>
> Tim.
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