I'm 99% sure they are Taylors. I bought a matched pair of the RFP tubes with 2
year warranty about 3 years ago. At that time, they told me the two brands are
produced at the same time, but the RFPs are cherry picked so there's less of a
risk on the extended warranty. It was worth the extra $10 to me for the
extended warranty. I had them in a TL-922 first after the poor plate welds on
the Eimacs sent my Plate V to the grids and took out the grid chokes. I've
seen this many, many times now -- I will NEVER pay twice as much for an Eimac
3-500Z. I now have the exact same tubes in a Henry 3K-A, and they take all the
abuse I give them and just keep making power. I frequently run AM, and have
had them as red (orange?) as an electric range heating element on High. Never
had an inkling of a problem, and when I do finally run them over the edge, I'll
buy another set of RFP 3-500ZGs. With 4kV on them, they will easily exceed 2kW
output with 100W. I'm sure with more drive they'
ll make
even more power, but I typically drive it with 70-80W to keep it legal. I
have no experience with the Amperex tubes, but I've read that they take a
little more drive to achieve the same power out as the Taylors/RFPs.
Joe, N3JI
Michael Tope <W4EF@dellroy.com> wrote:
I just bought a used Ten-Tec Centurion on behalf of a friend. We
both were under the mis-informed belief that it would be equipped
with Eimac 3-500ZG's. Instead it has a matched pair of RF Parts
branded PRC manufactured 3-500ZG's. Anybody know the track
record of these tubes compared to the Amperex 3-500ZG (made
in France?) or the ones Eimac used to make?
Thanks,
Mike, W4EF..................................................
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