At 01:50 PM 2/21/99 -0500, km1h@juno.com wrote:
>
>
>
>On Sun, 21 Feb 1999 09:00:08 -0800 Bob Marston <k1ta@earthlink.net>
>writes:
>>
>>At 03:37 PM 2/21/99 -0800, Arne Gjerning wrote:
>>>
>>>Is this an EIMAC tube or RCA? Can not find this nubmber in EIMAC
>>catalogs
>>>I have. Does it have descriptive number or EIA 4 digit number?
>>
>>It's an Eimac
>>
>>It's a cross between the 3CPX5000A7 and the 3CX15000A7. It's specs in
>>most
>>regards are the same as the 5000. But its current curves ressemble the
>>15000.
>
>
>The 15000B7 not the A7.
Apologies to all for this one I meant to say B7
>
>
>>
>>As Terry(W6RU) has already stated it's a pretty easy tube to build
>>around.
>>Medical Pulls are fairly cheap. N8RGR is the man to talk to if you
>>want to
>>obtain an example.
>>
>>The draw backs of this tube. The filament is of the Oxide Coated
>>Unipotential type. 15 Volts at 14 amps with a 6 Minute warmup time and
>>no
>>one rebuilds them. Secondly they have a fairly high output
>>capacitance
>>(36pf) So even though they have a max freq spec of 110Mhz your not
>>going to
>>match them up with a pi-network on 10 Meters.
>
>And why not?
>Details please.
>
>
>
>>
>>The complete specs for this tube are up on an FTP site setup by G8WRB.
>>The
>>design of the tube is fairly old itself. 1968 is the date on the data
>>sheet.
>
>OH ?
>1. 1988 on my data sheet with no revision listed.
>2. Not in a 1975 Eimac catalog.
>
You're right again Carl. This one was caused by a data sheet that was an N
generation copy. September 1988 Is the correct date.
73s
Bob K1TA
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