Unless the amp is in a constant mode service (FM/AM/RTTY), most any cooling
solution will be adequate. The tube is incredibly
rugged.
The contact point for the anode coolers is about a 2/3" flat surface and
through that point, the plate dissipation needs to be drawn
away. Any design of the cooling structure that will pull the heat off of that
point is workable. And depending on the cooling
structure, it may be possible to directly measure the body temps with an IR gun
which helps a lot in trying to determine if you have
enough cooling.
The problem with the muffin fan is the air flow is not even across the surface.
So if you use a muffin fan, some ducting may be
required to get the air flow over whatever dissipation structure you are using.
The grid contact side also needs a little bit of
air flow.
A blower by nature does not have this issue - although it takes a lot more
physical space as a tradeoff and needs to ideally work
with a chimney structure to be effective.
73, Jeff ACØC
www.ac0c.com
-----Original Message-----
From: Dave M
Sent: Tuesday, November 23, 2010 12:42 PM
To: toesonnose@hawaii.rr.com ; amps@contesting.com
Subject: Re: [Amps] Tube Cooling
I am currently working on a 3 tube GI7B deck and have opted to go with a blower
and chimney system rather than muffin fans , what
lead me to this decision is the fact that muffim fans will PROBABLY work where
a proper blower and chimneys WILL work , I dont want
to have to build it twice and any extra time it takes to do it this way the
first time will be made up with the fact that I have
one less failure point in the future
......................................................................................................
73 VE3DV , Dave
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