[Amps] Coupling a blower to an air system socket

[Alan Ibbetson]

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?

73, Alan G3XAQ
-- 

Alan Ibbetson
alan at g3xaq.net