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[AMPS] YC-156

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Subject: [AMPS] YC-156
From: (
Date: Sun, 21 Feb 1999 13:50:38 -0500

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.

>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.

73  Carl  KM1H

>Bob K1TA
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