>
>Subject: Re: [AMPS] Mount pi-net capacitors vertically
>Date sent: Thu, 14 Sep 2000 22:04:06 -0700
>From: measures <2@vc.net>
>To: "jeff millar" <jeff@wa1hco.mv.com>, "AMPS"
><amps@contesting.com>
>
>>
>> >
>> >I went to the site mentioned a few days ago with all the amp pictures,
>> >http://www.angenent.org/W7IUV/amp-pix.htm and noted that most of these
>> >put the vacuum variables horizontal with the tuning shafts straight out
>> >the front panel. With all the talk about stray inductance and grounding,
>> >I'd like to ask why they all do this?
>> >
>> Ä Builders who use horiz. mounting apparently did not read the Jennings
>> catalog.
>
>From page 12 of the 1990 Jennings catalog:
>
>Mounting Position- Units may be mounted in any position. When
>large capacitors are mounted horizontally, both ends should be
>supported to prevent excessive stresses (vertical mounting
>preferred).
>
>You can mount your capacitors in any position, as long as they
>aren't the large capacitors.
... not an example of good reading skills, Tom. Jennings essentially
says to use end supports with large units if one chooses horizontal
mounting.
>
>I asked Jennings about that several years ago and they said by
>"large" they mean capacitors over 10 pounds weight. They are
>worried about the bending moment on the front seal.
>
Another consideration is the constant stress of gravity on the soft
copper plates. Vertical mounting solves this problem and greatly reduces
stray L at the Tune-C, which is normally one of Mr. Rauch's pet peeves.
. Vertical mounting also takes way less chassis space. // Mr.
Lenkowitz, of Hiway Sales told me he had seen horizontally mounted vacuum
caps short from being set down too hard. The soft copper plates bent and
shorted
>
later, Tom
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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