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Re: [Amps] Can I cool too much the tubes?

To: Rudy Bakalov <r_bakalov@yahoo.com>, amps@contesting.com
Subject: Re: [Amps] Can I cool too much the tubes?
From: Colin Lamb <k7fm@teleport.com>
Reply-to: Colin Lamb <k7fm@teleport.com>
Date: Mon, 16 Aug 2010 10:40:41 -0700 (GMT-07:00)
List-post: <amps@contesting.com">mailto:amps@contesting.com>
"I guess the fundamental question is why did Ten Tec select 90 CFM fan instead 
of 250 CFM."

Assume amp designed with 250 cfm fan and going to review to marketing, this 
might be the conversation:

Marketing: "This thing is too loud, no one will buy it."

Engineering: "250 cfm is what is necessary during a contest, to adequately cool 
the tube."

Marketing:  "No one will buy this thing, it sounds like a vacuum cleaner."

Engineering:  "I can cool it with 90 cfm, but then it will overheat at 
altitude, or during hot weather, or when heavily used."

Marketing: "Drop it to 90, we have to sell it."

Engineering: "No way.  I am going to management and tell them you are screwing 
around with the amp.  You are no engineer."

A week later:

Marketing: "Next time just do as we tell you.  You darn engineers think you 
know everything.  If we listened to you and your paranoia, we would go broke."

Amp goes out the door with 90 cfm.

This is a hypothetical story, of course.  It never is like that in the real 
world.

73,  Colin  K7FM


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