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Re: [Amps] Coupling a blower to an air system socket

To: <ka4inm@gmail.com>, amps <amps@contesting.com>
Subject: Re: [Amps] Coupling a blower to an air system socket
From: Bill Fuqua <wlfuqu00@uky.edu>
Date: Fri, 15 Mar 2013 22:09:04 -0400
List-post: <amps@contesting.com">mailto:amps@contesting.com>
I believe the air system socket connected to a duct is especially useful when
you can't have a pressurized cabinet. There are situations where large cabinets
are used and sealing them is not possible.

73
Bill wa4lav

At 09:04 PM 3/15/2013 -0400, KA4INM wrote:
On 03/15/13 16:58, Alan Ibbetson wrote:

For minimum airflow resistance for a forced air cooled amplifier it
would seem the blower needs to discharge in a straight line directly
into the underside of the valve socket. This leads to a fairly tall
structure with the blower underneath the RF deck.

What is the "right" way to make the physical connection between blower
and air system socket? Rigid ducting? Something resilient like rubber?
Or (what intrigues me) how about a fabric transition duct as shown in
several places here

http://users.pipeline.com.au/~burst/stc.htm

The "floppy" fabric seems attractive as a way to take up minor (major?)
misalignment between the blower and RF deck if they are built as
separate units and should help isolate any blower vibration. A competent
seamstress (seam-master) would be able to take differences in duct shape
and size in their stride too.

Has anyone got a feel for the pros and cons of the use of fabric rather
than more rigid blower couplings?

  I should think the difference is negligible and not worth the bother.
Many successful amplifiers using all kinds of air cooled tubes have been built with the system where they are simply pressurizing the box under the tube/s with the air passing through or around the tube/s above.
--
  Ron  KA4INM - Youvan's corollary:
                Every action results in unwanted side effects.
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