[Amps] MLA-2500 Tube Conversion

[Mark - N5OT]

I'm interested in that, too.  I have an MLA-2500 carcass here sans 
tubes, and I have been wondering what to do with it.  the GI7B 
conversion always seems to rise to the surface of that conversation.

I would gladly sell this project to someone else.  I believe I now have 
more potential projects here than I will be able to accomplish in this 
life.

73 - Mark N5OT


On 10/11/2021 8:41 AM, Roger Parsons via Amps wrote:
> I have seen that comment previously. What I have never seen are any numbers or documents to support it. If any non-anecdotal sources exist I would be interested to see them.
>
> I converted a Clipperton L to GI-7Bs a while ago and I believe that its linearity is not only acceptable for amateur radio purposes, but better than many transceivers.
>
> 73 Roger
> VE3ZI
>
>
>
> On Sunday, 10 October 2021, 21:17:47 GMT-4, 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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