Good one that makes sense. The 250 CFM produces 59 dba worth of noise.
--- On Mon, 8/16/10, Colin Lamb <k7fm@teleport.com> wrote:
From: Colin Lamb <k7fm@teleport.com>
Subject: Re: [Amps] Can I cool too much the tubes?
To: "Rudy Bakalov" <r_bakalov@yahoo.com>, amps@contesting.com
Date: Monday, August 16, 2010, 1:40 PM
"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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