Apologies for OT posting. I tried to put this on a high-end audio NG but it never showed up. Since you guys know everything (g), here's the problem:
I had friend run new TV sound through a high-end Harmon Kardon stereo (used but good!). Speakers on new TV were hopeless, and TV had no place for headphone jacks.
I need to watch with headphones because of lousy hearing; need "proximity effect" -- sound close to ear.
This worked OK for a while, but now can only get mono. Have switched around adapters, jacks and headphones; tried them on other audio equipment; problem is with the stereo input (hole).
Was told that stereo comes from jack touching SIDES of input. ???
Dilemma: Can the input be repaired economically?
Hate to buy another stereo which might not even have as good sound.
Any thoughts welcome.
1) if headphone plug isn't in "just right", sometimes
2) Problem might be between the TV and the stereo.
On a stereo plug, there is tip, center, and ring. Tip
goes to both channels, center is one ear, and ring
(back towards the rubber handle) is the other ear.
play the difference between channels. It will be faint, worse on some
material than others.
If the sound is as strong as before, the channels are probably shorted
together. If the headphones have a plug with a cover that unscrews, it's
easy to check with a meter. With the phones unplugged, there should
probably be about 50 ohms between channels. If it goes to zero when
they're plugged in, there must be something wrong in the jack or the
wiring. Jacks are cheap, but before I replaced it, I'd unsolder the
wires and use the meter to see if there was a short not involving the jack.
Tip and ring is stereo left and right. Sleeve is ground.
I think the jack is not making contancts with either tip or ring of the
plug. You have to open the stereo amp and take a look. bend the tangs
in the jack or replace it with new one. Remote possibility maybe one
channel of the amp. is shot. Get an old stock good jack not new Chinese
Then you're not getting mono, you're getting half of the stereo (mono
would be the sum of L and R in both ears).
The "ring" connection is not being made. Could be a problem with the
jack, could be a problem with however it was wired into the TV.
YES! Unplug jacks, stereo is fine.
The history of how jacks & input degraded over time makes it almost certain that the input is the problem. At first I'd get stereo sporadically, now only L. ear.
I do not have the skill to take the stereo apart and do repairs recommended above.
Will have to ask around for the right kind of shop to take it to. Wish my smart neighbor hadn't moved out of town. He could have done it!
On Thursday, June 12, 2014 12:40:44 AM UTC-7, Gz wrote:
Thanks Greg -
Some poster(s) sounded a little iffy about WD40. I have no basis for judgment either way.
Just found an old tube of Memorex head cleaner. Label reads:
"This solution is specially formulated for use with the non-abrasive tape in the Memorex Head Cleaner. It will clean magnetic tape heads, pinch roller guides and capstans and will not deform robber parts. Contains Isopropyl Alcohol."
Is that something I could try in the jack?
No. If you get both speaker when the headphone is unplugged, then it's
not the input. Maybe you're using the term "input" wrong. There's a
high probability it's the jack. Maybe the plug or the headphones or
the wiring from plug to headphones.
Are these earbuds?
or big enough to cover your ears?
My first post was about testing headphones. But I forgot to say,
and it's better here, that if HB doesn't have a voltmeter, mulimeter
whatever, the easiest way to test the headphones is with a battery and a
battery holder maybe and a wire or two.
I usually use the battery in the meter, which is usually 1.5 volts
Is there any chance a 9v battery will burn out the headphones, if one
just taps the connector to the headphone? I don't have any real
experience with earbuds.
If a 9volt battery is thought to be dangerous to the earbud, he can take
a 1.5 volt battery, get someone to hold one end of two wires to each end
of the battery, and he can hold the other end to the Tip and Sleeve and
then to the Ring and Sleeve, and he should hear clicks in each ear, one
ear at a time.
On Thursday, June 12, 2014 1:11:24 PM UTC-7, micky wrote:
Have tried with 2 different "big enough to cover ears", 1 on-ear, and 1 ear
Nothing delivered stereo.
Yes, sorry, I know virtually nothing about audio so other NG members have s
traightened me out on terminology. Jack is hole in stereo. Plug is what y
ou put in.
I'm pretty sure it's jack, which worked at first, then degraded. You hi-te
ch experts are suggesting ways of "cleaning" it. If that doesn't do it, as
I understand, it may have been damaged or deformed by my not fastening it
down so it didn't bump against the walls of jack as the cord to headphones
NOT USING EARBUDS. USING STUDIO-TYPE CLOSED HEADPHONES or ON-EAR HEADPHONE
Interesting!!!! So if I DON'T hear a click, does that mean the problem is
at one of the points you list?
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