)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
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
DigitalJunkie said:
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.
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_basics/ab_pdf/ab1993-07.pdf
A simple method can be seen here and one that if desired could be built into many amps
http://www.avahifi.com/root/audio_basics/ab_pdf/ab1993-07.pdf
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