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

[R.Measures]

On Aug 7, 2005, at 11:26 PM, Joe Isabella wrote:

> 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 --

Agreed, but I have  never  seen bad anode cooler welds in tubes that 
were made in San Bruno instead of in Salt Lake City.

> 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,

3-500Zs typically begin to run out of emission above 420mA per each.

> but I typically drive it with 70-80W to keep it legal.

But of course, and we always drive at the speed limit on freeways.

> 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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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org