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Old 1st October 2012, 12:29 PM   #1
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Question Headphone output

Hi, being a relative newcomer to valve amps, I have a mengyue mini valve amp of about 12w per channel that I would like to add a headphone output to ideally via a separate jack that would isolate the speakers when plugged in.
I'm reasonably competent at electronics, can someone explain the easiest way to accomplish this. I'm using a set of Grado sr80 headphones, I'm unsure of the impedance of these?
Any help much appreciated,
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Old 1st October 2012, 04:36 PM   #2
disco is offline disco  Netherlands
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32 ohms. If you'd live near I could trade you a set of 5W output transformers (1:24). That would be a simple solution
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Old 1st October 2012, 09:27 PM   #3
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I did this once with an EL84 SET amplifier. The approach I took was to put a resistor in parallel with the headphones on the secondary of the OPT. This gives the output stage an 8ohm load.

for 32 ohms, a 12 ohm resistor or something close to that should be just fine.

don't blow out your ears...
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Old 2nd October 2012, 09:33 PM   #4
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hi all, as I said, ideally would like to mute main speakers when plugged into amp via jack,would have to drill chassis to fix in jack for h/phones. As i've no experience of doing this a drawing may be the best idea if anyone could help,i can supply a photo of amp internals if needed?
many thanks for any help,
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Old 3rd October 2012, 01:22 PM   #5
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I usually wire my amps so that the headphone jack is always on, and the speakers are turned on or off by a small switch next to the speaker terminals. Works for me.
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Old 4th October 2012, 01:53 PM   #6
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Originally Posted by alexmoose View Post
The approach I took was to put a resistor in parallel with the headphones on the secondary of the OPT. This gives the output stage an 8ohm load...don't blow out your ears...
Maybe an voltage divider made by two resistors to reduce the level going to the headphones might be an additional improvement. This could be adjusted the way that the headphones have subjectively the same listening level as your speakers in use.
That way, one would not accidentally start with a deafening volume setting.

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