Larry,
My 87A came with 3cx800A7s , but I rotate spare 3CPX800s once a
year, and they work fine. Been doing this for 5 years.. No
problems here. You can ask on the Alpha
reflector, Alpha87a@yahoogroups.com
73,
Dudley
WA5QPZ
At 12:31 PM 12/29/2007, Larry P. Greenberg wrote:
>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
>_______________________________________________
>Amps mailing list
>Amps@contesting.com
>http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|