[AMRadio] [AMRadio} 4cx250 / 4x150a socket wanted

[Jerry]

Hi Brett,

I am no amp expert but you do know that there are several different versions
of the 4CX250b sockets?  Some with no built in screen bypass cap and others
with different by-pass values?  I believe the 600 and 600A have a 3700pf
screen bypass within the socket.

73 Jerry
K1JOS

-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Brett Gazdzinski
Sent: Monday, March 04, 2013 22:12
To: AM Radio Discussion List
Subject: Re: [AMRadio] [AMRadio} 4cx250 / 4x150a socket wanted

I had a nice QSO on 40 meters with w3mtg (I think it was) last month, and he
was running a screen modulated 4cx250b that sounded great, so I thought I
would build a 4cx250b rf deck to experiment with.
It came out very well, I just swappedit out for my 3x 4D32 rf deck and used
the same control deck.
Everything is metered and adjustable, so its handy for experiments.
I put various transformers in the screen feed and adjusted things in every
way, and it sounded nasty no matter what I tried.
At best, you could understand my speech, but it was nasty.
As another experiment, I turned on the modulator (pair of 811's) and it
worked very well.
At 1200 volts I get close to 200 watts out, and it modulated very well.
So I want to rebuild it with two tubes in it, but i only have 2 sockets, one
all metal thing, and one plastic (green?) one that mounts with about 8
screws.
The metal one seemsto have no mounting screws or holes???

I will trade one for the other, or other parts, but I need two matching
sockets.

Brett
N2DTS 

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