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

[Pete Smith N4ZR <n4zr@contesting.com>]

I *think* I have read (here?) that there is a big difference between the 
physics of pressurized and unpressurized systems in this respect.  Is 
there anyone out there who understands this and can comment?
73, Pete N4ZR
Check out the Reverse Beacon Network at
http://reversebeacon.net,
blog at reversebeacon.blogspot.com.
For spots, please go to your favorite
ARC V6 or VE7CC DX cluster node.

On 3/15/2013 9:04 PM, 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.
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps