I wouldn’t say that using an LDMOSFET is a retrofit.
It would basically mean building an entirely different amplifier with a
different power supply, different input and output networks, etc.
> On Dec 9, 2025, at 5:32 AM, Steve Thompson via Amps <amps@contesting.com>
> wrote:
>
> https://www.ampleon.com/products/extremely-rugged/75-v/ART4K0FX.html
>
> But not the easiest retrofit 🙂
>
> Steve G8GSQ
>
>> On 09/12/2025 08:37, Douglas L via Amps wrote:
>> Has anyone created a work around to replace the 3CX800A7 tubes in the
>> AL-800, the AL800H, Alpha, Ten-Tec and other amps that used this tube?
>> Eimac versions are greater than $1500 and the Chinese subs, last I looked,
>> were pushing toward $1000/tube. Machlett, Penta and the like are simply
>> rebranded Chinese tubes.
>> Medical pulls have largely dried up with MRI and other machines going solid
>> state.
>> Thus the tube pricing has gotten ridiculous.
>> Perhaps the only answer is going to solid state amps?
>> 73,
>> DougWA1TUT
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>
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