[Amps] Drake L4/L4-B tube replacement - 3-400Z or 3-500Z or 3-500ZG

[R.Measures]

On Oct 20, 2004, at 4:02 AM, Jason Buchanan wrote:

>
> Not to beat a dead horse but is there any benefit to plugging 3-500ZG 
> tubes in a stock Drake L4 or L4-B?  Is the stock Drake power supply 
> sudsy enough to show any benefit to using the bigger tubes or is a 
> 3-400Z the limit the power supply can provide for?

3-400Zs and 3-500Zs have the same peak cathode emission and the same 
anode-V rating.  For RTTY service, he 3-500Z has an advantage.  For 
SSB, it doesn't.

> I noticed the amplification factor for the 3-400Z is 200 where it is 
> 130 or less for the 3-500Z and 3-500ZG tubes.  thanks..........

3-400Zs are slightly easier to drive.

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