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Old 28th March 2005, 07:34 PM   #1
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Default Speaker tube amp with headphones

Hi!

I've searched a bit here but found nothing conclusive.
I would like to ask how i connect a headphone output to my tube amplifier. It's a World Audio Design KECL82 amp (sadly discontinued)

Thank you all
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Old 4th April 2005, 12:02 AM   #2
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seems like a couple of 120 ohm 3 watt build out resistors from the transformer secondary plus two of 100 ohm from "hot" to ground/common and a speaker /headphone DPDT should do the trick.

not the most elegant solution but one that should work.

Be aware that you want the output transformer to see a load at all times or you risk damage to it
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Old 4th April 2005, 04:44 AM   #3
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For one of my tube amps I just plug in some 8ohm 10W resistors,with my headphones in parallel....it works great!
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Old 4th April 2005, 07:14 AM   #4
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Originally posted by DigitalJunkie
For one of my tube amps I just plug in some 8ohm 10W resistors,with my headphones in parallel....it works great!

I'm sure that is what I would do too if headphones could make my day. Sadly they don't. Listening to music would be a heck of a lot cheaper and take up way less space.

I have a MingDa MC34B tube amp that has a big multi way toggle switch on the side to go to headphone mode. They place large power resistors across the output xfmer secondaries while disconnecting the speakers. I do not know if they also insert some ohmage in series with the phone jack.
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Old 6th April 2005, 12:15 AM   #5
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Parallel resistors is not the best method and either series resistance or series/parallel (L-Pad) better.

A simple method can be seen here and one that if desired could be built into many amps

http://www.avahifi.com/root/audio_ba.../ab1993-07.pdf
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Old 7th April 2005, 11:21 AM   #6
Cassiel is offline Cassiel  Libya
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Old 7th April 2005, 04:01 PM   #7
Sherman is offline Sherman  United States
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