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[AMPS] YC-156

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Subject: [AMPS] YC-156
From: (Bob Marston)
Date: Sun, 21 Feb 1999 16:43:38 -0800
At 01:50 PM 2/21/99 -0500, wrote:
>On Sun, 21 Feb 1999 09:00:08 -0800 Bob Marston <>
>>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 
>>>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 
>>regards are the same as the 5000. But its current curves ressemble the 
>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 
>>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 
>>one rebuilds them. Secondly they have a fairly high output 
>>(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. 
>>design of the tube is fairly old itself. 1968 is the date on the data 
>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.

Bob K1TA

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