Its all been right here for years thanks to a long time AMPS member..
http://www.g8wrb.org/pentodes/
Carl
KM1H
----- Original Message -----
From: "DF3KV" <df3kv@t-online.de>
To: <amps@contesting.com>
Sent: Thursday, May 06, 2010 4:45 PM
Subject: Re: [Amps] 5CX1500A
> The Penta data sheets shows IM3 figures in AB1 as follows:
>
> 2.5KV, 1090 out, -38db
> 3KV, 1330 out, -36db
> 4KV, 1785 out, -33db
>
> If someone needs a copy I will send the pdf
>
> 73
> Peter
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of Jim Barber
> Sent: Donnerstag, 6. Mai 2010 22:21
> 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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