>
>...is 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 [SMTP:w8ji@akorn.net]
>> 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
>> W8JI@contesting.com
>>
>> --
>> FAQ on WWW: http://www.contesting.com/FAQ/amps
>> Submissions: amps@contesting.com
>> Administrative requests: amps-REQUEST@contesting.com
>> Problems: owner-amps@contesting.com
>
>--
>FAQ on WWW: http://www.contesting.com/FAQ/amps
>Submissions: amps@contesting.com
>Administrative requests: amps-REQUEST@contesting.com
>Problems: owner-amps@contesting.com
>
>
- R. L. Measures, 805.386.3734, AG6K, www.vcnet.com/measures.
end
--
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