[AMPS] AMPEREX 3-500Z(G) TUBES

[Rich Measures]

>My friend Ahron, 4X1FQ is looking for Amperex representative 
>in U.S. ( fax or e-mail address ) and for any impressions on 
>their 3-500Z(G) tubes : performance & reliability compared with
>original Eimac specs. The AMPS archives don't have enough
>infos.
Amperex never made anything but graphite [G] anode cooler 3-500s and 
3-400s.  The average Mu of the Amperex 3-500 is about 200, and the Eimac 
version *was* about 130.  I use a pair of Amperex 3-400Zs -  one of which 
was manufactured in 1967 - in my SB-220.  The filament potential is low 
and the VHF parasitic suppressors are low-Q/low Rp - factors that I 
believe are partly responsible for the 30 year life. 

Rich...

R. L. Measures, 805-386-3734, AG6K   


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