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.
73,
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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