[Amps] MLA-2500 Tube Conversion

[Robert W5AJ]

https://w5aj.eqth.net/Rtubes.jpg

Are the tubes in photo GI-7B?    I don't find any markings on them but ham
I bought from (decade ago perhaps) said GI-7B
I'm asking because it's difficult to list these for sale without knowing!!!
  Thanks   Robert

On Sun, Oct 10, 2021 at 8:17 PM Carl <km1h at jeremy.qozzy.com> wrote:

> 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 at contesting.com>
> To: "Amps" <amps at 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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>
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