Thats also the way National recommended it back in 63. It was also the
method used for customers to check the matching of their tubes.
I talked with Ray Heaton many times as I was a secondary source of several
components in the 7 series amps. Id also worked on Nationals vapor cooled
military amp using the same tube as the 70V and passed along some
information on the development issues. Those were interesting days when
competitors were friendly and often cooperative at the engineering level.
Carl
KM1H
----- Original Message -----
From: "Van K7VS" <wa7fab@cdsnet.net>
To: "Carl" <km1h@jeremy.mv.com>; "Paul Gerhardt" <phgerhardt@gmail.com>;
<amps@contesting.com>
Sent: Thursday, December 31, 2009 11:17 PM
Subject: Re: [Amps] Testing tubes for an Alpha 78
> that's exactly how Alpha suggests you check the tubes, one at a time. in
> fact regarding one of the three holers they suggested eliminating one of
> the tubes (as I thought one of them was bad) and running the amp with two
> tubes and some cloth plugging the empty hole. Van, K7VS
>
> --
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