[Amps] Alpha 87A Tubes

[Dudley Hurry]

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 at 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
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