Headphone Jack problem. [solved]

jason8777 · 2277

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Offline jason8777

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on: May 13, 2015, 09:14:57 AM
I just finished building the amp.  Resistance and Voltage checked out OK.  When I plug in the headphone jack all the way I can only hear left channel of headphone working.  However, If I pull the headphone jack up a little or move it a little then  both channel work again.  Please advise what is wrong. Thanks in advance.
« Last Edit: May 14, 2015, 04:12:56 PM by Caucasian Blackplate »


Offline Grainger49

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Reply #1 on: May 13, 2015, 09:24:15 AM
Crack FAQ #12 covers this.

This is a good sticky, more "guys" should give it a read.


Offline Paul Birkeland

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Reply #2 on: May 13, 2015, 01:09:58 PM
Quote from: jason8777 on May 13, 2015, 09:14:57 AM
I just finished building the amp.  Resistance and Voltage checked out OK.  When I plug in the headphone jack all the way I can only hear left channel of headphone working.  However, If I pull the headphone jack up a little or move it a little then  both channel work again.  Please advise what is wrong. Thanks in advance.
This is almost always an issue with the wiring from the RCA jacks to the pot, or an issue between the 100uF coupling caps and the headphone jack.

How were your resistance readings across each RCA jack?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline jason8777

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Reply #3 on: May 14, 2015, 09:51:56 AM
It works fine now.  Thank you.  Now to speedball upgrade.  I'm building this amp for a friend.  The first one I built for myself work perfectly.  Thanks again.


Offline Strikkflypilot

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Reply #4 on: May 14, 2015, 08:28:05 PM
Can I ask what the problem was and how it was solved?
Just for the sake of learning.

Home system:
Sources: Ibasso DX90, Google Chromecast Audio optical out
DAC: Schiit Gumby
Amp: Bottlehead Mainline
http://bottlehead.com/smf/index.php?topic=7463.0
Phones: HD800S

Office:
Sources: Iphone/ Ipod
DAC: Dragonfly Red+Jtrbug
Amp: Crack/Speedball heavily modded
Phones: HD580,HD600 grilles

Offline jason8777

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Reply #5 on: May 15, 2015, 08:46:47 AM
Quote from: Strikkflypilot on May 14, 2015, 08:28:05 PM
Can I ask what the problem was and how it was solved?
Just for the sake of learning.
  I used the screwdriver to poke around the metal on the headphone jack, resolder the wires on the jack, loosing the crew on top a little bit and twisted the headphone plug... Hey it works :). Just finished upgrading speedball, I think my friend gonna like it.  ;D  One more to go.
« Last Edit: May 15, 2015, 09:08:45 AM by jason8777 »


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