1971 Philips N4450
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Philips Pro 12

Promoted as a "home studio" stereo recorder/amplifier, the N4450 was a three-speed quarter-track recorder designed for vertical or horizontal operation and had automatic and manual reverse.

An electronically-controlled Hall brushless DC motor was used for the capstan drive and two DC air-gap motors for the two spools, which provided tension so that no mechanical friction on the spools was necessary.

Six heads were fitted, an erase, record and playback for each direction and all transport functions were solenoid-controlled.

Reels up to 10½ inches were accommodated and the built-in stereo amplifier delivered 20 watts per channel. The motors could be turned off for amplifier use only.

Other features included a three-step fast winding speed control, transparent sliding level controls, remote control capability, an in-built splicing device underneath the head cover and a built-in synchronous clock with programmable start/stop functionality.

Additional images are featured on the CD-ROM.

Specifications at a glance
1971 - 1973
Price when new (in the UK)
Track system
quarter-track stereo
six: two each erase, record and playback
electronically-controlled Hall brushless DC capstan motor
two DC air-gap motors for the two spools
Maximum reel size
Tape speeds
7½, 3¾ & 1 ips
Frequency response ( 3dB)
7½ ips: 40Hz - 20kHz
3¾ ips: 40Hz - 15kHz
1 ips: 60Hz - 8kHz
Wow & flutter
0.15% at 7½ips
Signal to noise ratio
less than 1%
Rewind speed
less than 250 seconds (3600ft). less than 150 seconds (1800ft)
Audio output power
20 watts per channel
microphone 0.1 mV / 2 kohms
aux 2.0mV / 20 kohms
pickup 1.5 mV / 47 kohms
tape 2 mV / 20 kohms
tuner 100 mV / 100 kohms
monitor 1 V / 50 kohms
headphones 3 V / 400-600 ohms
loudspeakers 20 watts across 4-8 ohms
tape 1 V / 50 kohms (during playback)
21¼ x 20 x 9¼ inches (540 x 508 x 235 mm)
44lbs (20 Kg)
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