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@somis.org>
To: "John" <crazytvjohn@yahoo.com>
Cc: <amps@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@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@contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
> >
> >
>
> Richard L. Measures, AG6K, 805.386.3734. www.somis.org
>
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>
>
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