That's why my HB linear has a 4CX1500A.
David
KW4DH
On 6/20/2012 5:57 PM, Carl wrote:
> The 4CX1500B is a direct replacement in a Collins 30S1 without any changes
> OR the increased screen voltage mod can be done for more power. Idle current
> bias needs a tweak and a heat extractor is a good idea if its used heavy
> duty. The nominal filament current is 1A more.
>
> A friend had a pair on 2M that would do over 3000W for EME and contests.
>
> Not to be confused with a 4CX1500A which has a real grid and can be well
> abused without damage.
>
> Carl
> KM1H
>
>
> ----- Original Message -----
> From: "David Kirkby" <david.kirkby@onetel.net>
> To: <dhallam@knology.net>
> Cc: "Vic K2VCO" <k2vco.vic@gmail.com>; "Amps reflector"
> <amps@contesting.com>
> Sent: Wednesday, June 20, 2012 3:52 PM
> Subject: Re: [Amps] 4CX1500B's -- worth using?
>
>
> On 20 June 2012 20:37, David C. Hallam <dhallam@knology.net> wrote:
>> That's what I was trying to imply. The writer of the original post on the
>> matter seemed to have the idea that a 4CX1500B was not as good as a
>> 4CX1000A.
>>
>> David
>> KW4DH
> I don't think they are direct replacements. IIRC the screen voltage is
> different, though perhaps not so drastically so that your could not
> use the same screen voltage. The filament of the 4CX1500B needs more
> current than that of the 4CX1000A if I recall correctly. The 4CX1500B
> will produce a cleaner signal.
>
> I built a twin 4CX1000A amp for 2m, and never did get it working very
> well. I recall speaking to John G4FRX (now GW4FRX) and he said the
> 4CX1000A caused more problems for hams than any other tube. I don't
> think its considered one of Eimacs best tubes. The 4CX1500B is
> certainly superior.
>
> As I say, there are date sheets on my web site.
>
> dave
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