[Amps] [BULK] - Re: 4CX350 distortion products?

[Karl-Arne Markström]

In the Philips/Mullard data book the
IM3 products at 30 MHz are quoted as -29 dB down from one tone 
and IM5 -30 dB down.

The operating point quoted was 2200 V plate voltage, 300V screen voltage, 100 mA standing plate current,
and a PEP output of 320W per tube.

Normally PA designs with the 4CX350A used RF negative feedback to improve the IM performance.

73/

Karl-Arne
SM0AOM



----- Original Message ----- 
From: "Steve Katz" <stevek at jmr.com>
To: <craxd1 at ezwv.com>; <amps at contesting.com>
Sent: Wednesday, March 30, 2005 6:52 PM
Subject: Re: [Amps] [BULK] - Re: 4CX350 distortion products?


> 
> 
> 
> Hmmm,
> 
> I was thinking someone on here a while back mentioned it was the same tube
> but was beefed up a bit about the cooling. I dont have the spec sheet so was
> going on recollection. I've never used one in an amp so cant comment
> further. Thanks for letting me know.
> 
> Best,
> 
> Will
> 
> ::Definitely very different tube from the 250 family.  I've used the 4CX350F
> (26v version of the A) in several homebrew amps only because the tubes were
> readily available "new surplus" (JAN 4CX350F) for $10 each back in the late
> sixties, when I got them.  Higher screen voltage requirement, different
> control grid bias requirement, and higher mu than the 250 family for sure.
> I could drive a pair of the 350s to 1 kW output on two meters with about
> four watts drive...-WB2WIK/6
> 
> 
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