Hallicrafters S-38 loose lead question
Radio
around to recapping it this weekend. All went well and it does play
but not as well as I figure it should. I did find one loose wire that
is attached to S1B terminal “O” and goes nowhere. There is another
lead attached to that same terminal which goes to the antenna terminal
lug 4. I don’t see this extra lead on the circuit diagram and it does
appear to be a lead that was there when the rig was built. It look
like a cream colored lead with red stripes. I wonder if anyone has
any idea where this lead is supposed to go? I
Geoffrey S. Mendelson
> . I have had an S-38 on the shelf for a few years and finally got
> around to recapping it this weekend. All went well and it does play
> but not as well as I figure it should. I did find one loose wire that
> lead attached to that same terminal which goes to the antenna terminal
> appear to be a lead that was there when the rig was built. It look
> like a cream colored lead with red stripes. I wonder if anyone has
> any idea where this lead is supposed to go? I
Was that a "gimmick" (a capacitor made by twisting two wires together)?
Geoff.
--
Geoffrey S. Mendelson, Jerusalem, Israel g...@mendelson.com N3OWJ/4X1GM
Richard Knoppow
"Radio" <kbr...@charter.net> wrote in message
news:20bf27a8-5ab2-42f8...@z20g2000prh.googlegroups.com...
There is a readable S-38 manual at Nostalgia Air and I
think also at BAMA.
From the schematic neither wire belongs there. The
terminal on the bandswitch goes to the top of the secondary
of the RF transformer for Band-2. My schematic shows only
three antenna lugs and they are not numbered. I suspect that
both wires may have been someone's modification.
The "gimmic" mentioned by another poster is used for
the BFO and is not in this section of the RX. I have an S-38
and could look at the bottom if you like but have no way to
make photos of it.
--
Richard Knoppow
Los Angeles
WB6KBL
dick...@ix.netcom.com
Radio
Hi Guys,
Thanks for the help so far. I made an error in my posting! The
other lead that is attached to S1B terminal "O" goes to lug 4 on the
antenna coil NOT the antenna terminal.
I will send you a picture Goeff and Dick
Thanks,
Karl
Richard Knoppow
OK, when I get the picture I will open the bottom of my
S-38 and see what there is.
paul @removeppinyot.removecom Paul P
wire wrapped around an detector wire. You can see C25 in this schematic:
http://www.nostalgiaair.org/PagesByModel/862/M0008862.pdf
I do remember finding a strange wire on the S-38 that I recently restored.
It killed band 2. I compared the actual circuit to the schematic and put it
back to the schematic. You can read about it starting at the third
paragraph here: http://www.ppinyot.com/H/s-38.htm
Not documented on the web page, I later ran into "Silver Mica Disease". I
took apart the IF cans and added external caps.
Other than that I do not know.
Good Luck,
Paul P.
"Radio" <kbr...@charter.net> wrote in message
news:20bf27a8-5ab2-42f8...@z20g2000prh.googlegroups.com...
. I have had an S-38 on the shelf for a few years and finally got
around to recapping it this weekend. All went well and it does play
but not as well as I figure it should. I did find one loose wire that
is attached to S1B terminal �O� and goes nowhere. There is another
lead attached to that same terminal which goes to the antenna terminal
lug 4. I don�t see this extra lead on the circuit diagram and it does
Radio
REMOVEcom> wrote:
> You may already know this - C25 inject the BFO oscillations. It is a simple
> wire wrapped around an detector wire. You can see C25 in this schematic:http://www.nostalgiaair.org/PagesByModel/862/M0008862.pdf
>
> I do remember finding a strange wire on the S-38 that I recently restored.
> It killed band 2. I compared the actual circuit to the schematic and put it
> back to the schematic. You can read about it starting at the third
> paragraph here:http://www.ppinyot.com/H/s-38.htm
>
> Not documented on the web page, I later ran into "Silver Mica Disease". I
> took apart the IF cans and added external caps.
>
> Other than that I do not know.
> Good Luck,
> Paul P.
>
>
> news:20bf27a8-5ab2-42f8...@z20g2000prh.googlegroups.com...
> . I have had an S-38 on the shelf for a few years and finally got
> around to recapping it this weekend. All went well and it does play
> but not as well as I figure it should. I did find one loose wire that
> lead attached to that same terminal which goes to the antenna terminal
> appear to be a lead that was there when the rig was built. It look
> like a cream colored lead with red stripes. I wonder if anyone has
> any idea where this lead is supposed to go? I
Thanks for the web page Paul. The wire in the picture on that page
appears to be the same one that I have been questioning. That would
certainly explain why it is not connected to anything. My band number
2 is active so that would also be a good indicator. I did listen to
the radio last ngiht and could receive SW from all over the world on a
4 ft piece of wire.
Thanks to all who have responded to my question! This group sure is
a great tool for the radio hobby!
Thanks again. Do any of you have any thoughts or comments on
restoration of an RME-84 receiver? That is next on my list of things
to do!
Karl KC9AA
New London, WI
paul @removeppinyot.removecom Paul P
appears to be the same one that I have been questioning. That would
certainly explain why it is not connected to anything.
Karl,
Glad to be of help.
Paul P.
stan
Crazy question re foregoing!
The Hallicrafters S38 and S53 were post-war receivers; correct?
So that extra wire would have nothing to do with that war time ruling
that there were instructions that the short wave-bands of receivers in
certain parts of North America, during WWII, be disabled to
(supposedly) prevent enemy spies from receiving instructions via short-
wave?
Sounds like some of the same paranoia that we hear today!
More personally; in Britain, I recall as a child during WWII,
listening with my grandfather to propaganda broadcasts from Germany;
just a short distance across the North Sea.
Particularly to 'Lord Haw Haw' (William Joyce), who operated much in
the manner of Tokyo Rose; trying to disseminate false information and
British public dissatisfaction with Allied governments and military
commanders. Didn't work btw.
Some of his material was greeted with guffaws and remarks such as
"That's the third time he's sunk that ship"! After the war it was
ruled that he was a traitor, having held a British passport, despite
claiming an Irish grandfather and he was hanged. Also recall my father
sarcastically remarking "Pity they hanged him; he could have continued
his career as a radio comedian"!
Thanks for reading.
paul @removeppinyot.removecom Paul P
PP
Richard Knoppow
"Radio" <kbr...@charter.net> wrote in message
news:20bf27a8-5ab2-42f8...@z20g2000prh.googlegroups.com...
Karl sent me a photo via private e-mail. I opened and
looked at my S-38 and it does not have the wire he
indicated. The wire goes from the antenna tank section of
the bandswitch to the RF grid of the converter tube. The
schematics do not show any other connection to this point
nor is there any sign of on in my RX. I can only speculate
as to why this wire was added. Hallicrafters made almost
continuous changes in the details of their receivers so its
possible this is a factory job but I doubt it.
My S-38 is evidently a late one because the cabinet is
finished in black wrinkle rather than the earlier black
satin finish.
Bill M
>
> Karl sent me a photo via private e-mail. I opened and
> looked at my S-38 and it does not have the wire he
> indicated. The wire goes from the antenna tank section of
> the bandswitch to the RF grid of the converter tube. The
> schematics do not show any other connection to this point
> nor is there any sign of on in my RX. I can only speculate
> as to why this wire was added. Hallicrafters made almost
> continuous changes in the details of their receivers so its
> possible this is a factory job but I doubt it.
Could this have been somebody's fix to work around a bad rf coil?
-Bill
Richard Knoppow
"Bill M" <radio...@geemail.com> wrote in message
news:h19ck...@news5.newsguy.com...
Maybe but having an untuned input to the converter
would cause all sorts of problems. Since the set works
without the wire connected it suggests the coil is OK but
its easily enough checked.
The wire in the photo he sent _looks_ genuine enough,
at least its the same type of wire used in the rest of the
thing. Very puzzling.