[Amps] EIMAC 3-400 vs. 3-500 how to ID??

[Radio WC6W]

On Thu, 1 Jul 2004 22:54:54 GMT "bearlabs at netzero.net"
<bearlabs at netzero.net> writes:
> 
> 
> Due to lack of personal experience over the years with these tubes
> I don't know the answer, do you?
> 
>  - Is there a reliable way to ID an EIMAC 3-400 vs. a 3-500 beyond
> reading the silkscreened info? Assume it is rubbed off completely.

Hi  _-_-bear,
   A couple ways:

   The 3-400Z is about 1/2" shorter than a 3-500Z.  It may also be a bit
fatter... or just look that way because it is shorter.

   Unmodified, the 3-400Z comes with an integral 4 fin plate cooler, the
3-500Z doesn't.  

   The plate fins are longer in a 3-500Z.
  
   Easy to see the differences if you have them side by side.
  
>  - Q2. is there *any* reason in a standard ham two hole linear 
> amplifier to *not run a 3-400 with a 3-500?

   The 3-400Z has a somewhat higher mu than the 500, so it is not a good
match.
 
>  TIA,
> 
>      _-_-bear wb2gcr

73 & Good morning,
    Marv  WC6W






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