>Is the 500mA limit one imposed on safe conditions for the anode, or for the
// Neither. The 3-500Z has a linear peak-emission limit of c. 1.2a.
This corresponds to c. 400mA average. Initally, the 3-500Z had a rating
of 350mA. This was later increased
>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
>operation...no apparent change in anything:
// On CW or FM, this will probably fly ok. On SSB, driving a 3-500Z
above 400mA could result in a surprise tar and feathering at a hamvention
or flea market.
>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
// The grid diss is rated at 20w, 150mA x 85V is way under 20w.
>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." --
>> -----Original Message-----
>> From: Vic Rosenthal [SMTP:firstname.lastname@example.org]
>> 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
>> about running the plate current up to 500 ma for a short period during
>> only, so that you can tune the tank for the peak conditions that will
>> during SSB use. They specifically say that you should reduce drive in CW
>> give you 400 ma., and make reasonabale statements about the meter swing
>> should expect on SSB.
>> Vic, K2VCO
>> Fresno CA
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- R. L. Measures, 805.386.3734, AG6K, www.vcnet.com/measures.
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