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28th March 2005, 06:34 PM
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#1 |
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diyAudio Member
Join Date: Jan 2005
Location: Lisboa
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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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3rd April 2005, 11:02 PM
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#2 |
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diyAudio Member
Join Date: Nov 2000
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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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4th April 2005, 03:44 AM
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#3 |
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diyAudio Member
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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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4th April 2005, 06:14 AM
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#4 | |
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diyAudio Member
Join Date: Jun 2004
Location: Cool end of a soldering iron NW of Toronto
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Quote:
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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5th April 2005, 11:15 PM
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#5 |
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diyAudio Member
Join Date: Nov 2000
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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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