- Trimm Headphones - http://members.aol.com/tcsopr/trimpro.htm
Offers tube type technology instead of solid state and digital electronics. Also includes classic and military radio pictures, and information.
- Scott's Crystal Radios - http://members.aol.com/scottswim/index.html
Scott Balderson has a Headphone Museum and phones for sale. Also Crystal Radios and Test Equipment.
- 2000 Ohm Headphones - http://members.aol.com/tcsopr/parkinrx.htm
2000 Ohm Headphones in use by WB6FZH with his 1923 Parkin Crystal Radio.
- The Crystal Set Radio Club - http://groups.yahoo.com/group/thecrystalsetradioclub/
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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