[Amps] Drake L-4B fan - too small and too slow?

[R.Measures]

On Dec 30, 2005, at 6:16 PM, John wrote:

> Hi Jason
>   My L4 used Amperex 3-500Z tubes.  When used at the power level in 
> the drake manual and the Drake tune up procedure, did not show any 
> color except at long key down at I kw input.  The manual said they are 
> not to show color.

Does Amperex know this?

> The L4 was made for a short time before the L4B .  The L4 is much 
> rarer.  The ability to see the tubes causes problems for the mind.  
> Think of the poor tubes in the AL82.
>
>   john
>   kb9tc
>
>
>
>   Jason Buchanan <jsb at digistar.com> wrote:
>> I just sold my L4 and anything key down at or over 1kw input caused 
>> the
>> plates to glow very orange.
>
> same here - 3-400Z idle on SSB mode causes them to get dull orangish.
> Sometimes I wish I had some of the new 3-500Z graphite jobs but the 
> fan just
> isn't up to snuff to keep them alive.
>
>
> 73 Jason N1SU
>
> -- 
> Jason Buchanan - Boxboro, MA
> Website: http://n1su.com/
>
>
>
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>

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