[Amps] backwards plate transformer

[Carl]

----- Original Message ----- 
From: "Ron Youvan" <ka4inm at tampabay.rr.com>
To: "amps" <amps at contesting.com>
Sent: Friday, June 11, 2010 6:47 PM
Subject: Re: [Amps] backwards plate transformer


> Roger wrote:
>
>> A transformer is a transformer is a transformer and really don't care
>> which windings are input and which are output as long as the voltage and
>> current are within the windings ratings. However, if memory serves they
>> are a bit more efficient if the "high current" windings are closest to
>> the core.
>
>    I think it is a matter cooling, the core being a heat sink, to a 
> degree, but I am sure you could
> ventilate and interleave fins (alternate sheets of aluminum with the 
> windings) to where the
> outermost winding could be the high current winding and be cooler than if 
> it were wound on the core.
> -- 
>    Ron  KA4INM - The next election, I know what is going to happen, I'm 
> going to help.


A bit of air on the laminations helps dissipate the heat considerably, 
especially in a closed amp with a close fitting cover.
I use an assemblers hot plate thermometer to measure lamination temps, 
pretty basic but accurate and reliable.

Carl
KM1H