[Amps] 3CX3000A7 on 144 MHz

[Carl]

That would be a real stretch since the maximum frequency rating is 110 MHz 
and even if it could be made to work efficiency would be low.

Are there any European TV tubes available at affordable prices?

Carl


----- Original Message ----- 
From: "Conrad PA5Y" <g0ruz at g0ruz.com>
To: <amps at contesting.com>
Sent: Tuesday, February 04, 2020 2:35 PM
Subject: [Amps] 3CX3000A7 on 144 MHz


>I have just acquired 2 x  3CX3000A7 and I would like to put one on 2m.
>
>
>
> I have a few designs for but before I start I have 2 questions.
>
>
>
> The Heater current is 7.5V @ 51A - does anyone use a switch mode PSU?  Not 
> sure if Meanwell have anything suitable but that is where I would probably 
> start. Otherwise I have no idea where to get a custom transformer wound in 
> the Netherlands, which is where I live these days.
>
>
>
> I do not want to run in AB2 all the time am I correct to assume that I can 
> just switch in a Zener with a pass transistor to bias to class C? I have 
> never used a zero bias tube before.
>
>
>
> I could use a GM3SEK triode board of course!
>
>
>
> I already have a 4.5kV supply that will drop down to 4.2kV on load, if 
> anyone is using a 3CX3000A7 on VHF I would also like to know how much gain 
> to expect. I do not expect the 144MHz performance to differ from that of 
> 110 MHz based on observations with a YC-156.
>
>
>
> Regards
>
>
>
> Conrad PA5Y
>
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