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Re: [Amps] 5CX1500A

To: "DF3KV" <df3kv@t-online.de>, <amps@contesting.com>
Subject: Re: [Amps] 5CX1500A
From: "Carl" <km1h@jeremy.mv.com>
Date: Thu, 6 May 2010 17:16:24 -0400
List-post: <amps@contesting.com">mailto:amps@contesting.com>
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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