Portable Battery Operated Transistor Record Player
Transistors; OC71 OC72 OC72
Power supply; 7.5 volt, Ever Ready AD42
Dimensions mm; W=220, H=125,
See the KB NRP11, in the Radio Museum
See a demonstration of the KB NRP11 working
The KB NRP11 is a 3 transistor player which is fitted with a Garrard BA1
battery record deck, designed to play 7 inch singles at 45RPM.
The cartridge is a Cosmocord GP69 crystal pick-up with a Cosmocord SK2
The whole unit is powered by a single 7.5 volt battery such as the Ever
Ready AD42, and the speed of the player is adjusted with a 100 ohm
potentiometer so that as the battery voltage runs down the speed can be
There should be a printed Stroboscope disk on the turntable to aid setting
the speed accurately.
The player switches on as the pickup arm is moved toward the record.