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

[Bill Fuqua]

Besides the 3-400Zs glow brighter. Must add a window to appreciate!
73
Bill wa4lav


At 01:12 PM 10/20/2004 +0200, DF3KV wrote:

>----- Original Message -----
>From: "Jason Buchanan" <jsb at digistar.com>
>To: <amps at contesting.com>
>Sent: Wednesday, October 20, 2004 1:02 PM
>Subject: [Amps] Drake L4/L4-B tube replacement - 3-400Z or 3-500Z or
>3-500ZG
>
>
> >
> > 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?  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..........
>
>Hi Jason,
>
>the power-supply is the weakest part of the L4/L4-B followed by the
>bandswitch.
>With the original power supply you are limited in power, with an
>external power supply
>you are limited by the bandswitch.
>IMHO there is no benefit to use more expensive tubes in those linears,
>the gain ofthe 3-400Z is better, so you can use the transmitter with
>reduced power for better linearity
>
>73
>Peter
>
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