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[AMPS] The 3-500Z, having been officially beaten to death...

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Subject: [AMPS] The 3-500Z, having been officially beaten to death...
From: (2)
Date: Fri, 28 Sep 2001 17:04:28 -0700
> now shattered glass and bits of metal.
>However, I do have a question, if anyone knows: 
>AL-80B uses side-flow air cooling which appears substantial in volume but
>does not use pressurized cooling, chimney, etc.  I can't complain about its
>service, it's remarkable, but I remember reading lots of material many years
>ago about how critical it was to keep the filament pins below a certain
>temperature so as not to exceed the base seal ratings, blah,
>blah...whatever.  I thought that was one of the primary reasons for the
>pressurized cooling (blower, moving air from base to envelope, up and out)
>systems used by Henry, Drake, et al in their 3-500Z models.
>Anyone have any input/comment on this-?
//  Air system sockets are notorious for melting solder in pins 1 and pin 
5.  Transverse cooling seems to do a better job provided that pins 1 and 
5 receive forced air.  

cheers, Steve

>"Each success only buys an admission ticket to a more difficult problem." --
>Henry Kissinger
>> -----Original Message-----
>> From:        Tom Rauch []
>> Sent:        Friday, September 28, 2001 11:33 AM
>> To:  AMPS; Vic Rosenthal
>> 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.
>> It comes up because someone has been driven into saturation, and 
>> distorts everything he reads or hears when he amplifys it. 
>> ;-)
>> The manuals specifically state exactly what you say Vic, but 
>> Eimac did specifically say IVS operation of the 3-500Z would allow 
>> operation at over 500mA or higher for long time periods with no 
>> deterioration in service life.
>> So even if the manual said what Rich claims it said, which it does 
>> not, it would still be OK.  
>> 73, Tom W8JI
>> --
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-  R. L. Measures, 805.386.3734, AG6K,  

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