[Amps] 3-500z

[Mike Schatzberg]

Hello Rich:

I have here spec sheets for the old Eimac triodes, the newer version Eimac,
and the Amperex tubes.  I have never seen a formal spec sheet for the
Chinese triodes.  Can you post the Chinese Graphite Anode Specifications
here?  I know that Pride in the PRC produces these tubes, and probably
private labels for others.  I believe the Mu may be as high as 160 on those
tubes with the 600 watt plate dissipation, but I have no written
confirmation of that.

Thank you.

73,

Mike
WB2AJI
----- Original Message ----- 
From: "R. Measures" <r at somis.org>
To: <jsb at digistar.com>
Cc: "Mike Schatzberg" <cherokeehillfarm at earthlink.net>;
<amps at contesting.com>; "sb200" <sb200 at optonline.net>
Sent: Wednesday, October 26, 2005 4:38 PM
Subject: Re: [Amps] 3-500z


>
> On Oct 26, 2005, at 1:26 PM, jsb at digistar.com wrote:
>
> > On Wed, 26 Oct 2005, R. Measures wrote:
> >
> >>> umph - well if the typical off-the-shelf AL-80B sits idle at 2900v to
> >>> the plate (I do not know if this is its normal operating voltage),
> >>> 1600w input would seem to be a lot of plate current for 1 tube.
> >>
> >> The AL-80 instruction manual says 500mA + is okay.  Some people tell
> >> the
> >> truth and some don't.
> >
> > The photos i've seen of AL-80Bs have Amperex tubes - I thought Amperex
> > built their tubes using graphite plates that get "sick" with that kind
> > of
> > use.
>
> Graphite anode or metal anode, the limiting factor is linear-region
> cathode/filament emission. 400mA of anode current is the rating from
> all manufacturers.
>
> cheers, Jason
> >
> > Something about graphite poisoning or deformation of the anode surface.
> >
> >
> > --
> > 73 Jason N1SU
> > http://n1su.us/
> >
> >
>
> Richard L. Measures, AG6K, 805.386.3734.  www.somis.org
>