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2000 Ohm Headphones in use by WB6FZH with his 1923 Parkin Crystal Radio.
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Scott Balderson has a Headphone Museum and phones for sale. Also Crystal Radios and Test Equipment.
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You have to JOIN first but then you will see the archives with a lot of useful data and discussions about hi-z headphones.
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Offers tube type technology instead of solid state and digital electronics. Also includes classic and military radio pictures, and information.
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