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Re: [Amps] 3CX800A7 low grid current version?

Subject: Re: [Amps] 3CX800A7 low grid current version?
From: Steve London <>
Date: Sun, 17 Mar 2019 14:18:38 -0600
List-post: <>
This sounds like the same tube that Alpha was selling a few years ago. It was also touted as "low grid current". The specs are exactly the same as the standard tube, as far as I could tell. Alpha specifically did not recommend using it in the Alpha 87.

The designation on the Alpha tube is:
VTU-3CX800A7LG "Alpha Tubes" 1450

BTW, in my converted 76PA, I do NOT find the pair of 3CX800A7LG's particularly easy to drive with the Alpha broadband input transformer. It typically takes 60-70 watts for 1500 watts output, depending on the band.

Steve, N2IC

On 03/16/2019 02:33 PM, Floyd Sense wrote:
I see that RF Parts carries a "low grid current version" of the 3CX800A7 tube, but haven't been able to locate any technical info on the tube.  I assume that this version of the tube might result in lower grid current than the standard version, at a given power level with all other things being equal.  Can someone verify that and are there any other considerations when using such tubes in my Alpha 89 amp?

73, K8AC

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