Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives
Support This Site: Contributors :: Advertise


It is currently Oct Mon 14, 2019 5:30 am


All times are UTC [ DST ]





Post New Topic Post Reply  [ 12 posts ] 
Author Message
 Post subject: using modern headphones on a hallicrafters sw 500?
PostPosted: Jun Sun 16, 2019 6:38 am 
Member

Joined: Aug Sat 19, 2017 6:55 am
Posts: 149
Location: Glendale, AZ, USA
ETA Would I be ok just using modern headphones with greater than 50 ohm impedance? I didn't realize that these were available, but apparently I am an idiot.


I've been doing some searching, and it seems most just use the old style high impedance headphones. I'd rather not have to go that route if possible.

Has anyone either converted their radio or made an adapter box to use modern headphones? I'd even be interested in a "store bought" solution.

The pictures I have seen in the for sale section all seem to show the old headphones having some sort of tips on the ends, vs a 1/4 inch type jack. My radio has the more modern 1/4 inch jack style, but it takes the high impedance 50 to 10K ohms headphones.

Thanks,
Russ

_________________
Unless other wise noted, I am only interested in the electronics, not what it looks like. Thanks.


Top
 Profile  
 
 Post subject: Re: using modern headphones on a hallicrafters sw 500?
PostPosted: Jun Sun 16, 2019 11:13 am 
Member
User avatar

Joined: Dec Wed 25, 2013 7:57 am
Posts: 3837
Location: USA
Like many modern sets, the headphone jack for the SW500 is in the same circuit as the 8 ohm speaker. Nearly all modern headphones or even an external speaker plugged into that jack should work just fine. For stereo or smaller headsets with 1/8" plug, you can just use a simple (stereo to mono) plug adapter.


Attachments:
Screen Shot 2019-06-16 at 3.10.56 AM.jpg
Screen Shot 2019-06-16 at 3.10.56 AM.jpg [ 18.5 KiB | Viewed 495 times ]
Top
 Profile  
 
 Post subject: Re: using modern headphones on a hallicrafters sw 500?
PostPosted: Jun Sun 16, 2019 3:44 pm 
Member

Joined: Sep Thu 23, 2010 6:37 am
Posts: 11698
Location: Powell River BC Canada
The phones you use may injure your hearing, or someone else's.

A pair of 2000 ohm headphones cannot draw more than .06 watt
from an 8 ohm, 1 watt source.

Do consider someone sitting down, not hearing anything in the phones,
even though they cranked the volume up all the way. Then they notice
the standby switch.

_________________
de
VE7ASO VE7ZSO
Amateur Radio Literacy Club. May we help you read better.
Steve Dow
ve7aso@rac.ca


Top
 Profile  
 
 Post subject: Re: using modern headphones on a hallicrafters sw 500?
PostPosted: Jun Sun 16, 2019 6:06 pm 
Member

Joined: Jan Tue 16, 2007 7:02 am
Posts: 3128
Location: Lexington, KY USA
A series resistor or an L pad will limit the maximum power to the headphones. The value will depend on the phones. A small pot would let you set the attenuation to match the phones.

You can assemble a little box for the attenuator, with a plug for the radio and jack for the phones. Ideally, the plugs and jacks could be different enough so the phones cannot be plugged directly into the radio.

Ted


Top
 Profile  
 
 Post subject: Re: using modern headphones on a hallicrafters sw 500?
PostPosted: Jun Sun 16, 2019 10:10 pm 
Member

Joined: Sep Thu 23, 2010 6:37 am
Posts: 11698
Location: Powell River BC Canada
In years past, stereo headphones meant to attach to an amplifier, say to speaker
system B, were sold with a jack in small tube that added series resistors.

_________________
de
VE7ASO VE7ZSO
Amateur Radio Literacy Club. May we help you read better.
Steve Dow
ve7aso@rac.ca


Top
 Profile  
 
 Post subject: Re: using modern headphones on a hallicrafters sw 500?
PostPosted: Jun Sun 16, 2019 10:32 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 8071
Location: 13 Critchley Avenue, PO Box 36, Monteith Ont, P0K 1P0
We are adults here. We should be awake and aware. Turn the volume down before plugging in the phones or switching from standby.

Yes, ordinary headphones with a mono-stereo adaptor will work.

cheers

EDIT : typo


Last edited by John Bartley on Jun Mon 17, 2019 1:20 pm, edited 1 time in total.

Top
 Profile  
 
 Post subject: Re: using modern headphones on a hallicrafters sw 500?
PostPosted: Jun Mon 17, 2019 12:18 am 
Member

Joined: Jan Tue 16, 2007 7:02 am
Posts: 3128
Location: Lexington, KY USA
The modern phones need not be 8 ohms.

Some sort of attenuation may be desirable just to knock down the volume-down hum and noise you will hear. It's nice to adjust things so the volume in the phones is reasonable at the normal volume control setting.

Ted


Top
 Profile  
 
 Post subject: Re: using modern headphones on a hallicrafters sw 500?
PostPosted: Jun Mon 17, 2019 12:53 am 
Member

Joined: Sep Thu 23, 2010 6:37 am
Posts: 11698
Location: Powell River BC Canada
We certainly are adults, and those who lived through the stereo amplifier era, at
least from a service point of view, experienced the scenario of blown speakers, and
transistors, from cranking volume, then flipping the tape monitor switch off.

_________________
de
VE7ASO VE7ZSO
Amateur Radio Literacy Club. May we help you read better.
Steve Dow
ve7aso@rac.ca


Top
 Profile  
 
 Post subject: Re: using modern headphones on a hallicrafters sw 500?
PostPosted: Jun Mon 17, 2019 1:38 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 5314
Location: Rochester NY USA
Another factor: hum might be considerable in headphones, even if it's barely audible in a speaker. Attenuation will take care of that.

_________________
My web page: https://bit.ly/2rxq4qx


Top
 Profile  
 
 Post subject: Re: using modern headphones on a hallicrafters sw 500?
PostPosted: Jun Mon 17, 2019 7:22 am 
Member

Joined: Aug Sat 19, 2017 6:55 am
Posts: 149
Location: Glendale, AZ, USA
Thanks, all.

I will be the only one using this. Just me and my wife, well we have a cat and dogs, but none of them are interested at all in this except for me. :lol:

I found a pair of Sony headphones that are 60 ohm impedance, might give them a try. Not too expensive. Will continue to look around for now. If all else fails, I will use a pair of cheap headphones I have laying around for now.

Russ

_________________
Unless other wise noted, I am only interested in the electronics, not what it looks like. Thanks.


Top
 Profile  
 
 Post subject: Re: using modern headphones on a hallicrafters sw 500?
PostPosted: Jun Mon 17, 2019 9:52 am 
Member

Joined: Sep Thu 23, 2010 6:37 am
Posts: 11698
Location: Powell River BC Canada
:D
Attachment:
well we have a cat and dogs, but none of them are interested.jpg
well we have a cat and dogs, but none of them are interested.jpg [ 72.26 KiB | Viewed 403 times ]

_________________
de
VE7ASO VE7ZSO
Amateur Radio Literacy Club. May we help you read better.
Steve Dow
ve7aso@rac.ca


Top
 Profile  
 
 Post subject: Re: using modern headphones on a hallicrafters sw 500?
PostPosted: Jun Mon 17, 2019 1:14 pm 
Member
User avatar

Joined: Jun Wed 14, 2006 11:49 pm
Posts: 7625
Location: Leo, IN or Zellwood, FL
russosborne wrote:
ETA Would I be ok just using modern headphones with greater than 50 ohm impedance?
Thanks,
Russ


YES Your making an issue where there isn't one. If you already have a decent set of stereo headphones with a 1/4" plug just plug them into the radio. You will hear only one Ear because the headset is stereo and the plug is stereo. So you need an adapter stereo to mono 1/4". Or if your headset has the small plug on it then you need a 3.5mm = 1/8" stereo to 1/4" mono adapter. As to sound level that's what they put a volume control on the radio for. I'll give you an example. Here I have my nearly NEW ham radio transceiver. It is designed to hook up an 8 ohm speaker and yes I do have one. I also have a couple pairs of headphones. These also have a Mic hanging on the headset. The Heil Pro Set I have I know has 200 ohm small speakers built into a very comfortable to wear cushioned headset. The other set is a Yamaha stereo headset with boom mic and it too is I am sure probably in the same range of 100 to 200 ohms PER SIDE. Well the first thing that happens when you parallel TWO earphones together for MONO use rather than Stereo is that 200 ohms becomes 100 ohms.

As to any reference to "High Impedance Phones" that would be talking about headsets from back in the 20's & 30's when Speakers as in HORN SPEAKERS were also High Impedance. By high we are talking about 2000 ohms per ear or per speaker. They are uncomfortable to wear as well as the sound quality of those early headsets or early speakers is terrible.

John k9uwa

_________________
http://www.JohnJeanAntiqueRadio.com


Top
 Profile  
 
Post New Topic Post Reply  [ 12 posts ]  Moderators: Marcc, Norm Leal

All times are UTC [ DST ]


Who is online

Users browsing this forum: Google [Bot], Jthorusen and 14 guests



Search for:
Jump to:  




























Privacy Policy :: Powered by phpBB