[Amps] 4CX1500B's -- worth using?

[Steve Katz]

Vic, the 4CX1500B can produce >> legal limit output power if you drive
it harder than the test conditions shown where Ig is only 0.53 mA.  The
tube can handle a few mA of Ig and produce substantially more output, at
the sacrifice of the wonderful -43 dB IM3 and -48 dB IM5 numbers shown.

Bob WB2EGI and I modified (really, just built a suitable power supply
for) a Canadian AF HF amplifier using a pair of 4CX1500Bs and it
produced 3kW output without exceeding the grid dissipation rating of 2W
total.  Cranked back to only 1500W output, the Ig was "zero" indicated.

-WB2WIK





-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]
On Behalf Of David C. Hallam
Sent: Wednesday, June 20, 2012 12:09 PM
To: Vic K2VCO
Cc: Amps reflector
Subject: Re: [Amps] 4CX1500B's -- worth using?

It's my understand that a 4CX1500B is a direct replacement for a
4CX1000A with a plus that it has an extra 500W dissipation capability.

David
KW4DH

On 6/20/2012 12:28 PM, Vic K2VCO wrote:
> I just found a couple of 4CX1500B's among my junk (I had thought they 
> were 4CX1000's). I was surprised to see that the data sheet indicates 
> that typical operation of a single tube as an AB2 linear amplifier
wouldn't even produce legal limit output:
>
> http://www.classiccmp.org/rtellason/tubedata/4cx1500b.pdf
>
> Also, this tube seems to have a pretty fragile grid. Any comments 
> about its suitability for a ham amplifier?
>


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