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[AMPS] 3-500Z

To: <>
Subject: [AMPS] 3-500Z
From: (Steve Katz)
Date: Fri, 28 Sep 2001 10:55:42 -0700
Is the 500mA limit one imposed on safe conditions for the anode, or for the

The question is based on SOA regarding Pdiss; I run my AL80B at all sorts of
(intermittant) high current levels but without exceeding 500W dissipation,
seems to take it very much in stride for the past 10 months of apparent change in anything:

600mA @ 2600V = 1560Wdc input; output (measured) = 1100W; apparent
efficiency 70%, apparent Pd = 460W (realizing some drive power appears in
the output).  Under these condx the amp is just hitting a small amount of
compression (<1 dB) but with more drive the output will continue to climb;
problem is Ig, which gets hard to keep below 150mA when you drive it too

What, exactly, is the issue?  Does Eimac even still manufacture a 3-500Z?


"Each success only buys an admission ticket to a more difficult problem." --
Henry Kissinger

> -----Original Message-----
> From: Vic Rosenthal []
> Sent: Friday, September 28, 2001 9:56 AM
> To:   AMPS
> Subject:      Re: [AMPS] Noises in electrolytic capacitors
> 2 (Rich) wrote:
> > //  (ref SB-1000 and AL-80 owners' manuals)
> > When challenged on his assertion that the 3-500Z was re-rated by Eimac
> > for 500mA 
> I don't know why this keeps coming up, but the SB-1000 and AL80B manuals
> talk
> about running the plate current up to 500 ma for a short period during
> tuning
> only, so that you can tune the tank for the peak conditions that will
> occur
> during SSB use.  They specifically say that you should reduce drive in CW
> to
> give you 400 ma., and make reasonabale statements about the meter swing
> you
> should expect on SSB.
> 73,
> Vic, K2VCO
> Fresno CA
> --
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