Jim,
Did the esteemed author of that series happen to voice an opinion as to what
would be the "best of all possible worlds for ham service?" Now that would
be an interesting discussion.
73/jeff/ac0c
--------------------------------------------------
From: "Jim Barber" <audioguy@charter.net>
Sent: Thursday, May 06, 2010 3:20 PM
Cc: <amps@contesting.com>
Subject: Re: [Amps] 5CX1500A
> A text-searchable DVD set returns:
>
> "Notes on the Eimac 5CX1500A power pentode"
> Arthur Reis, K9XI
> Ham Radio, August 1980, pp61,62
> Text-only article, mostly anecdotal notes
>
> - article describes some early production problems with tubes made
> between 1975 and 1979 (check your date code)
>
> - author recommends loading tube as heavily as possible (!?) and not
> exceeding 6000 ohms plate impedance
>
> - typical cautions on *not* bumping filament voltage to try to increase
> emission. (note the author claims 0.25V over-voltage will reduce life by
> half!)
>
> - author claims Henry used the tube in their 4K model
>
> - overall, author was rather lukewarm about using the tube in amateur
> service. Nothing stated about IMD performance.
> "The 5CX1500A may not be the best of all possible worlds for linear
> amplification in the Amateur service"
>
> HTH,
> Jim, N7CXI
>
> Chris Pedder wrote:
>> While I cannot pretend that my search was comprehensive, the only
>> 'similar' thing I could find was a 4CX1500B amplifier described by
>> W6HHN on page 56 of the April 1971 issue. I could find nothing on the
>> 5CX1500A.
>>
>> Perhaps somebody else can do better.
>>
>> Best wishes,
>>
>> Chris G3VBL
>>
>>
>> At 18:39 06/05/2010, Patrick Barthelow wrote:
>>
>>> If you can find someone's digital files copies of HAM RADIO
>>> MAGAZINE, they did a feature article about the 5 CX-1500A sometime I
>>> think in the Mid 80s.
>>>
>>> Best Regards,
>>> 73, de Pat Barthelow AA6EG
>>>
>>
>>
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>>
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