[Amps] Vacuum Variable Fatigue Failures

[Saandy Eban]

                                                                       .…all
I can tell you is that, in 40 years in the profession, I never saw one with
cracked bellows

The only fault I ever saw was drying up of the tuning screw, with an
attendant screech of the worst kind.

If that happens, some times you can sometimes put a few drops of sewing
machine oil on the shaft and release it.  If not you can still use it with
the attendant screech   

 

73 Alex         4Z5KS

 

 

 

 


From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of ToddRoberts2001 at aol.com
Sent: Saturday, February 16, 2008 11:01 PM
To: amps at contesting.com
Subject: Re: [Amps] Vacuum Variable Fatigue Failures

 

In a message dated 2/16/2008 2:20:16 P.M.  Eastern Standard Time, 

aa6eg at hotmail.com writes:

Folks,

 

I was looking  closely at the mechanical marvel that is a Jennings Vacuum 

variable  capacitor.

I am wondering about whether the copper bellows arrangement that  allows 

extension and 

contraction of the "rotor" have a finite number of  cycles back and forth 

before they are likely

to fatigue crack at the folds of  the copper.  

 

 

The Jennings PV4-500 is listed as having over 2.5 million life  cycles.

 

73 Todd WD4NGG

 

 

 

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