[Amps] Coupling a blower to an air system socket

[Bill Fuqua]

   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.
>_______________________________________________
>Amps mailing list
>Amps at contesting.com
>http://lists.contesting.com/mailman/listinfo/amps