[sdiy] Tube ring mod

[John L Marshall]

I'm familar with the 4CX15000A. I believe that it was used in the once
popular RCA 20 kW FM broadcast transmitter. The little brother 4CX5000A was
used in a Fritz Bauer AM broadcast transmitter. Modulators were a pair of
4-1000As. With the usual audio processing, CBS compressor, limiter and
dynamic pressence equalizer the 4-1000As plates developed a bright orange
glow. I used the baby brother, a 4CX250R, in a DIY 6 meter transmitter.

For a truely "warm tube sound" by all means use the 4CX15000A.

Take care,
John
------------------------------------------------------------------
Pacific Northwest Synthesizer Meeting
August 9, 2003
www.sound-photo.com
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----- Original Message ----- 
From: "Magnus Danielson" <cfmd at swipnet.se>
To: <john.l.marshall at gte.net>
Cc: <metasonix at earthlink.net>; <synth-diy at dropmix.xs4all.nl>
Sent: Saturday, June 14, 2003 3:46 PM
Subject: Re: [sdiy] Tube ring mod


> From: "John L Marshall" <john.l.marshall at gte.net>
> Subject: Re: [sdiy] Tube ring mod
> Date: Sat, 14 Jun 2003 15:11:14 -0700
>
> > Isn't the 4CX15000A only a tetrode? Not too good for really linear.
>
> True, but then you missed the underlying irony... it's also a tube good
for
> serious frying of beginners... speced for 10 kV and 15 kW it may _NOT_ be
the
> optimal beginners tube if tossed the appropriate power. Self-oscillation
in that
> one may also be objected by local authorities... ;O)
>
> None of the other proposals where very "normal" in this respect.
>
> > No tube patents either. A lenticular mirror for light bulbs is as close
as I
> > can get.
>
> Well, we have to work on this one, don't we? ;O)
>
> Cheers,
> Magnus