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

[Karl-Arne Markström]

Some Amperex 3-500Z were manufactured with graphite anodes 
(European designation YD1130).

In the Philips/Mullard databooks there was a general caution against running 
tubes with graphite anodes so hard that they showed any color.

73/

Karl-Arne
SM0AOM

----- Original Message ----- 
From: "R.Measures" <r at somis.org>
To: "John" <crazytvjohn at yahoo.com>
Cc: <amps at contesting.com>
Sent: Saturday, December 31, 2005 2:11 PM
Subject: Re: [Amps] Drake L-4B fan - too small and too slow?


> 
> 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/
> >
> >
> >
> > _______________________________________________
> > Amps mailing list
> > Amps at contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
> >
> >
> 
> Richard L. Measures, AG6K, 805.386.3734.  www.somis.org
> 
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
> 
> 
> -- 
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.1.371 / Virus Database: 267.14.9/217 - Release Date: 2005-12-30
> 
> 


-- 
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.371 / Virus Database: 267.14.9/217 - Release Date: 2005-12-30