[Amps] looking for source of air flow switch

[rgroh at swbell.net]

Try google for 'surplus airflow switch' and you will get a lot of hits. They range from sophisticated to very simple (e.g. a sensitive microswitch with a blade where the blade sticks in the air stream and is deflected by the airflow). Bought new they seem to be pretty pricey but I think you could fabricate something using a surplus microswitch and a homemade paddle - simply cut down the paddle size until the airflow setting is about where you want it. You could use a variac on your blower for an adjustable airflow source. 

Surplus Sales had one without a sail:
http://www.surplussales.com/Fans-Blowers/FansBlow-2.html

Look in industrial supply houses, air conditioner shops, etc.

73
Bob, WA2CKY

----- Original Message ----
From: Fern Rivard <crc at cyberlink.bc.ca>
To: amps at contesting.com
Sent: Saturday, September 29, 2007 10:34:11 AM
Subject: [Amps] looking for source of air flow switch

 
    I'm in the process of putting together a hb hf amp using the Eimac 8877 tube. I want to make sure that it's bullet proof in case I should have a failure with the blower so I'm trying to find a source of air flow switch similar to what I believe some Henry amps used  a Rotron 2A-1000 but I can't find anything on that switch anywheres. Any leads would be much appreciated.
    Thanks from Fern


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