The GI-7B is fine if all you care about is CHEEEEEP.
It also is a horrible tube for a linear and would sound great on 11M
----- Original Message -----
From: "Roger Parsons via Amps" <amps@contesting.com>
To: "Amps" <amps@contesting.com>
Sent: Sunday, October 10, 2021 5:41 PM
Subject: [Amps] MLA-2500 Tube Conversion
I converted an MLA2500 to a single 3CX800A7 some years ago, and it works
fine. If I was doing it again I think I would probably use a pair of GI7Bs
which are much cheaper.
I don't think you need an extra filament transformer - the existing
transformer has a 12V 4A winding which is plenty. (As others have
mentioned, the voltage will probably be too high and a series resistor is
called for.) The 6V winding can then have a voltage doubler on it to
supply relays and and LEDs.
73 Roger
VE3ZI
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