[Amps] Tube Cooling

[Jeff Blaine]

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 at hawaii.rr.com ; amps at 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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