BTH 4kΩ Crystal Set Bakelite Headphones BBC Radio WKG Wireless Headset Kopfhörer
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Cat's Whisker Radio - Ricevitore Galena - Detektorempfänger - Poste � Galène TOP QUALITY * WORKING BRITISH THOMSON-HOUSTON ( B.T.H. / BTH / BT-H ) LIGHTWEIGHT HEADPHONES WIRELESS TELEPHONES MANUFACTURED BY BRITISH THOMSON-HOUSTON CO. LTD. (Crown House, Aldwich, London WC2) GENUINE LEATHER HEADBAND BT-H LOGO MADE IN ENGLAND PATENT N O. 199678 (MOULDED ONTO BOTH HEADPIECES) ALSO WITH BBC / B.B.C. STAMP (MOULDED ONTO BOTH HEADPIECES) " TYPE APPROVED BY POSTMASTER GENERAL" LIKELY 4000 Ω / ohm * NOT TESTED ON AN OHMETER c1923 LIMITED SIGNS OF USE From the infamous 1920s Brown Brothers catalogue: "B.T.H. Phones have become famous for their wonderful sensitiveness and tonal quality. Comfortable and readily adjustable, faithfully producing speech and music with maximum amplitude of sound." kopfhörer / doppelfernhörer / hörmuschel / ohrmuschel casque � écouteurs / hovedtelefon koptelefoon / oortelefoon / auricular / audífono fone receptor para ouvidos / hörlurar SCARCE VARIANT WITH B.B.C./ BBC STAMP DESIGNED TO CONNECT TO A CRYSTAL RADIO RECEIVER DURING THE EARLY 1920s MY ITEMS TEND TO SUIT COLLECTORS OF: SPITFIRE HEADSET WIRELESS MIKROFON DETEKTOR EARPHONE CHURCHILL TELEPHONY WEHRMACHT TELEGRAPHY MICROPHONE CRYSTAL SET Detektor-Gerät Poste � Galène REENACTMENT RE-ENACTMENT Ricevitore Galena Feldfunksprecher
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