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

[Jerry]

I don't know if attachments come through but the metal sockets made by Eimac
have different internal screen bypass caps - you cannot see them but they
are there!

Here's their datasheet quote:  " These sockets have hermetically sealed
screen bypass capacitors to protect against moisture and dirt.
The SK-6OOA socket has all base terminals brought out separately. The
SK-61OA has cathode terminals 2, 4, 6 and 8 connected to the shell."

Attached are the two datasheets.  Also these sockets are designed to allow
forced air through the socket up thru a ceramic chimney (Eimac) SK606) for
cooling.

Jerry
K1JOS

-----Original Message-----
From: Brett Gazdzinski [mailto:Brett.Gazdzinski at verizon.net] 
Sent: Monday, March 04, 2013 23:09
To: Jerry; AM Radio Discussion List
Subject: Re: [AMRadio] [AMRadio} 4cx250 / 4x150a socket wanted

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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