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

[Brett Gazdzinski]

I read that.
The metal socket I have has a cap on it, .001 at 1000 volts, the plastic 
sockets do not seem to have any cap that I can see.
I am using the plastic socket, and it seems to work fine, no lack of highs 
on the audio, at least with plate modulation.
With screen modulation, it did sound very bassy, but that might have been 
for other reasons.

Brett
N2DTS
----- Original Message ----- 
From: "Jerry" <jsternmd at att.net>
To: "'Brett Gazdzinski'" <Brett.gazdzinski at verizon.net>; "'AM Radio 
Discussion List'" <amradio at mailman.qth.net>
Sent: Monday, March 04, 2013 10:41 PM
Subject: RE: [AMRadio] [AMRadio} 4cx250 / 4x150a socket wanted


> 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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