Neither transformer is light.
If its black and squat and looks like its coated in tar and then painted
over its a Hypersil. If the top laminations are showing and probably rusty
then its an EI.
This is a Hypersil in a rather grungy 78
http://www.qsl.net/hs0zed/Alpha78/Picture%20002.jpg
Carl
KM1H
----- Original Message -----
From: "Carol Richards" <n2mm@comcast.net>
To: <Amps@contesting.com>
Sent: Sunday, August 26, 2012 1:31 PM
Subject: [Amps] Alpha 78
> Thanks to everyone who responded to my question. When the 78 was converted
> over to 3CX800A's, the caps were replaced. Judging from the weight of the
> transformer it is an EI version. The consensus seems to be to run it at
> reduced power and put a muffin fan to add air cooling. I made the
> decision to run it abot 700 watts (50% of normal output). RTTY is a
> whole new ball game for me. After 52+ years of only CW and SSB, I must
> learn how to type... Next summer's project.
>
>
> Carol
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>
>
> -----
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