Nagra PORTABLE ANALOGUE AUDIO TAPE RECORDER Instruction Manual - page 18

44. PILOT AND CLAPPER INPUTS 

1. 

Ground 

2. 

CLAPPER: Clapper oscillator control input (control voltage + 4 

to 14 V) or switching on of QRR receiver by connecting to 

ground. 

3. 

XTAL: Internal crystal pilot generator out, 50/60Hz. 

4. 

PILOT IN: Pilot signal input, impedance 5 k Ohm. Input level  

0.5 – 25 V. 

45. LINE OUTPUT 

The line output of the Nagra 4.2 is on the right-hand side of the recorder. The load impedance 

should be equal to or greater than 600 Ohm. When the "Line and Phones" switch is in the position 

"Tape", the line output voltage is 4.4 V into 600  Ohm while playing back a tape recorded at 0 dB. 

The Nagra 4.2 can record at a level 4 dB higher than this, thus the maximum line output voltage will 

be  7 V. Unloaded, these voltages will be 10% greater. The line output uses two 4mm banana 

sockets. It is made up of by the secondary of a transformer and is floating. A banana socket 

connected to the chassis is available beside the line output sockets. 

46. GROUND (banana socket) 

47. LOUDSPEAKER