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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