3/6 ACCUMULA- Model MR.4 Magnetic Earpiece, low imp. 3 feet cord, subminiature plug and socket. Fully Guaranteed and supplied complete with transparent ear insert. Provides clear reproduction of music as well as speech. practically invisible cord Is connected to the earphone. switched tuning, complete with 3 valves and circuit. This lightweight miniature earpiece is convenient and comfortable to wear. UNIT CONVERTORS NEW: SUPER MINIATURE EARPHONE FOR TRANSISTOR CIRCUITS Here is a really sensitive dynamic earphone of exceptionally fine quality. 1PR PRECISION /4% RESISTORS Manufactured by Electrothermal, we offer the following values: 100K. A must for every constructor and Ham ', consists of moving coil padded head- phones and 'press to talk' microphone. COMPLETE HEADPHONE do MICROPHONE ASSEMBLY.
Tannoy power mikes only Crystal mike 22/8. Throat magnetic 4/8: Throat carbon 3 8: No. Supplied free is a small transformer unit which steps impedance up to 4000 ohms. Each unit has a built -in miniature HI- FI transformer to ensure the finest music and voice reproduction. The soft rubber ear moulds give correct spacing 1 for optimum acoustic load. use high quality permanent magnetic speakers with regulated voice coil. units will extend the frequency range of your receiver to enable you to receive amateur. 2 Ìl PRACTICAL WIRELESS November, 1960 HI -FI HEADP HONES These miniature HI- FI phones R.F.