[Amps] RF Parts OEM 3-500ZG's

[Joe Isabella]

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 at 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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