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

[Peter Voelpel]

I built a 4CX1000A push-pull amp for 2m in the past, it did about 3KW+
output and was extremely clean.
A couple of friends built them also with the same experience.

73
Peter, DJ7WW 

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of David Kirkby
Sent: Mittwoch, 20. Juni 2012 21:53
To: dhallam at knology.net
Cc: Vic K2VCO; Amps reflector
Subject: Re: [Amps] 4CX1500B's -- worth using?

On 20 June 2012 20:37, David C. Hallam <dhallam at 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
_______________________________________________
Amps mailing list
Amps at contesting.com
http://lists.contesting.com/mailman/listinfo/amps