[Amps] Ameritron AL-800

[Douglas L]

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 at 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
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
> 
> 
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps