[Amps] Can I cool too much the tubes?

[Roger]

  Hey! If it lasts through one of my 10 minute monologues it's certainly 
good enough for contests.
OTOH the amp I use has a multi speed fan. However it will run a long 
time at 1500 out on digital before the fan ever speeds up.

73

Roger (K8RI)

On 8/16/2010 1:40 PM, Colin Lamb wrote:
> "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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