I copied the following from the Alpha website.
The Alpha 87A, 89 and 86 were designed to use the YC-238 tube which is an
Eimac 3CX800A7 that has been screened for low grid current. Replacing one or
both of the tubes in your amplifier with a regular 3CX800 or with a 3CPX800
could lead to unintended problems and consequences which again we are not able
to cover under warranty.
I don't find YC-238 tubes on the Eimac website. While I understand that we may
not want to use non Eimac tubes in our amplifiers, I don't understand why
replacements cannot be non-matched Eimac 3CX800A7 tubes that can be purchased
from known wholesale dealers or reputable hamfest dealers. I would like to
keep spare finals on the shelf but $1,500 a pair is really steep.
Has anybody used regular 3CX800A7's in their amplifier? Is the YC-238
nomenclature an Eimac name or an Alpha name? Does anybody have a specification
sheet that they can send me?
Larry, WA9MAG
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