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Old March 6th 06, 04:36 PM posted to rec.radio.amateur.boatanchors
Rod
 
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Default Hallicrafters S-38 lack of sensitivity on the HF bands

I'm working on a Hallicrafters S-38 and have already recapped the radio
and even changed a few resistors that measured a bit high. I receive
loads of stations on the standard broadcast band, but the radio is not
nearly as sensitive on bands 2, 3, and 4. Anyone have some help with
this one? Perhaps an alignment would do the trick? Or is there
something else? Any help would be appreciated. Thanks.

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Old March 6th 06, 05:14 PM posted to rec.radio.amateur.boatanchors
Frank Dresser
 
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Default Hallicrafters S-38 lack of sensitivity on the HF bands


"Rod" wrote in message
oups.com...
I'm working on a Hallicrafters S-38 and have already recapped the radio
and even changed a few resistors that measured a bit high. I receive
loads of stations on the standard broadcast band, but the radio is not
nearly as sensitive on bands 2, 3, and 4. Anyone have some help with
this one? Perhaps an alignment would do the trick? Or is there
something else? Any help would be appreciated. Thanks.


What are you using for an antenna?

Frank Dresser


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Old March 6th 06, 06:09 PM posted to rec.radio.amateur.boatanchors
Rod
 
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Default Hallicrafters S-38 lack of sensitivity on the HF bands

Well, that could be a reason. I'm down in the basement with just a
short piece of wire that I connected for testing purposes. Perhaps I
should try something better. I have some dipoles strung for my ham
station. Perhaps that is all that's needed.

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Old March 6th 06, 07:06 PM posted to rec.radio.amateur.boatanchors
Stargatesg1
 
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Default Hallicrafters S-38 lack of sensitivity on the HF bands

Hi,
Given the age of the unit, and that you have already had to replace a few
components that had changed value, an alignment would probably be in order.
Try the better antenna first and if your happy with the sensitivity than
don't worry about it. I myself would do the alignment just to be sure.

Good Luck,
RoD


"Rod" wrote in message
oups.com...
I'm working on a Hallicrafters S-38 and have already recapped the radio
and even changed a few resistors that measured a bit high. I receive
loads of stations on the standard broadcast band, but the radio is not
nearly as sensitive on bands 2, 3, and 4. Anyone have some help with
this one? Perhaps an alignment would do the trick? Or is there
something else? Any help would be appreciated. Thanks.



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Old March 6th 06, 09:17 PM posted to rec.radio.amateur.boatanchors
Rod
 
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Default Hallicrafters S-38 lack of sensitivity on the HF bands

Well part of the my concern is that I'm working on another S-38 and
using the same piece of wire for an antenna, it picks up stations much
better and louder than the one in question. I'll get to the alignment
this week and then go from there. Thanks to all. Rod



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Old March 8th 06, 03:09 PM posted to rec.radio.amateur.boatanchors
Frank Dresser
 
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Default Hallicrafters S-38 lack of sensitivity on the HF bands


"Rod" wrote in message
oups.com...
Well part of the my concern is that I'm working on another S-38 and
using the same piece of wire for an antenna, it picks up stations much
better and louder than the one in question. I'll get to the alignment
this week and then go from there. Thanks to all. Rod


Swapping tubes with the sensitive s-38 was also a good suggestion. Make
sure the contacts on your bandswitch are clean.

Frank Dresser


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Old March 6th 06, 11:00 PM posted to rec.radio.amateur.boatanchors
 
Posts: n/a
Default Hallicrafters S-38 lack of sensitivity on the HF bands

On Mon, 6 Mar 2006 16:36:00 UTC, "Rod" wrote:

I'm working on a Hallicrafters S-38 and have already recapped the radio
and even changed a few resistors that measured a bit high. I receive
loads of stations on the standard broadcast band, but the radio is not
nearly as sensitive on bands 2, 3, and 4. Anyone have some help with
this one? Perhaps an alignment would do the trick? Or is there
something else? Any help would be appreciated. Thanks.

I am in the process of restoring two S-38's, a B and C model, in fact
just got through painting the case and starting to clean the chassis.
The radio has been recapped, but needs a new power cord. Should you
replace old cloth covered wires with modern wires also? I am new to
this so pardon my ignorance of the radios. I used to have one when I
was in jr. high and high school and wanted one for the nostalgia.
What else should one look for on the chassis to replace or
clean/replace?
Thanks


--
"What do you mean there's no movie?"
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Old March 7th 06, 01:15 AM posted to rec.radio.amateur.boatanchors
COLIN LAMB
 
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Default Hallicrafters S-38 lack of sensitivity on the HF bands

Cloth covered wiring is fine. I try not to replace things unless there will
be an improvement. Power cords can be unsafe, but the cloth usually does
not deteriorate.

Once caution about using an S-38 in the basement. Remember the chassis is
ac-dc and there can be some conduction through the floor. More than one
amateur has been killed working in a basement, when insulation failed. One
of the league's heavy hitters was killed in the 30's when his ac transformer
shorted out to a chassis and he became the path to ground.

A GFI would be a good investment in a basement when working with the old
gear.

Colin K7FM


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Old March 7th 06, 02:38 AM posted to rec.radio.amateur.boatanchors
Phil Nelson
 
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Default Hallicrafters S-38 lack of sensitivity on the HF bands

A GFI would be a good investment

Or isolation transformer. And carefully inspect the rubber washers that
insulate the chassis from the cabinet. If they are degraded, you can get a
shock from the metal cabinet, which is now connected to your power line.
Fortunately, they are easily replaced (check the plumbing supply department
at your local hardware store).

More info about safely operating a "hot chassis" radio can be found at
http://antiqueradio.org/safety.htm .

Phil Nelson


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Old March 7th 06, 09:04 PM posted to rec.radio.amateur.boatanchors
gb
 
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Default Hallicrafters S-38 LINKS

wrote in message
news:qon2qBoLzSnd-pn2-2LMqmkgD9OtW@localhost...
On Mon, 6 Mar 2006 16:36:00 UTC, "Rod" wrote:

I'm working on a Hallicrafters S-38 and have already recapped the radio
and even changed a few resistors that measured a bit high. I receive
loads of stations on the standard broadcast band, but the radio is not
nearly as sensitive on bands 2, 3, and 4. Anyone have some help with
this one? Perhaps an alignment would do the trick? Or is there
something else? Any help would be appreciated. Thanks.

I am in the process of restoring two S-38's, a B and C model, in fact
just got through painting the case and starting to clean the chassis.
The radio has been recapped, but needs a new power cord. Should you
replace old cloth covered wires with modern wires also? I am new to
this so pardon my ignorance of the radios. I used to have one when I
was in jr. high and high school and wanted one for the nostalgia.
What else should one look for on the chassis to replace or
clean/replace?
Thanks

Count Floyd (SCTV) was always a humorous character :-)

Web sites for various S-38 restorations and information:

Brian Ripley
http://www.thes38guy.com/Page_1x.html

Bob Piekarz - Original S38 cardboard backs (same original mfg) !
http://www.radioantiques.com/mall.html

Bill Turner's replacement electrolytic (Bob Piekarz also sells these for
Bill)
http://www.dialcover.com/caps.html

Stan Watkins
http://www.stanwatkins.com/hals38.htm

Phil Nelson
http://antiqueradio.org/halli08.htm

John's restoration
http://www.schmitzhouse.com/Johns_Electronics_08.htm

Just Radios - Capacitors (safety and others)
http://www.justradios.com/

w9gb




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