oldaudio, Philips N 4450 audiorecorder

This photo shows the linemixer (down-right), instead of the poweramp. No N 4450 ever had his own speakers, not even a small one for monitor purposes, so you must "rent" them from your home audiosystem, which is rather confusing. Why change every time you need speakers? Better connect a tape-out wire to the tape-inbuss from that homesystem and you keep it stationnair and clean and the floor free from cables.
In stead of the poweramp there is an extra six channel line mixer: three channels line in mono (with panning), one microphone in mono and two extra auxiliairy inputs, one in stereo. Included channel-directouts! Now you can mix six sources, level them up by the gain, pan them in the stereofield, and fade them in or out the master signal with the 4 sliders (left from the mixer). Mixing during recording or playing back! Extra outputs from the mixer. Custom build. Plugs: 6 mm phono.

Also there is a variable speedcontrol, the switch-led-button left from the four sliders. Setting the switch upwards: no speedchange, everything goes as the setting is: 4,75, 9,5 or 19 cm/sec. Setting the switch downwards: speedcontrol is up- or downwards wide variable (15% - 190%) by the turningknob below. Turning the knob to the middle makes the speed only changes a few.

Several improvements: see the reels pass along the coveredges. You can record or replay with the cover in its normal position.

You can use the machine for editing tape. It has an onboard tapesplicer. However, Philips did not take in count that tape-editing (-mounting) needs the brakes to set loose to let pull tape from the reels in order to get some manoeuvre freedom. Tape is very fragile!
The brakes are only loose by powering their solenoids. For that reason extra circuitry has been mounted: a toggleswitch between the sole-noidpower and the solenoids themselves. This toggleswitch is just located under the lower headcover, close to the tapesplicer, mounted on the chassis, coloured with green tip. Using the switch is ok., but don't forget to set the switch in normal position after use. When not, tape keeps running freely (engines off power, brakes free) and might flip over the edge from the reel: tape"salade" is the result.
By the way: use for tapemounting a very sharp cutter (NT-cutter, a scalpel will also do) and be sure the cutter is not magneted.

Two direction taperun, three engi-nes, one based on the Hall principle (keeps its own speed constant by detecting turning speed), double flywheels, speeds 4,75, 9,5 en 19 cm/sec., also widerange variable (pitch). Six heads. Echo in stereo, playback left to right and vice versa. Inputs phono, tuner, tape, microphone with sliders and a linemixer with gain, pan. Outputs for tape out, headphone, monitor, mix. Tape-tension sensors, variable wind-speed, cueing in both directions. Counter with autostop, auto-reverse at tape end. Lighted analog VU meters, lighted tiptouch taperun-buttons, lighted functionsettings. Clear acrylic cover for 26 cm. (10,4 inch) reels, horizontal or vertical operation. Weight about 20 kg., undamaged. Tuned for Basf mastertape 911. The Philips N 4450 needs power-voltage at the walloutlet from 50/60 Hz. at 110, 127, 220, or 240 volts. No earthing needed at the plug. A neonlamp in the backpanel shows if the N 4450 is connected to the walloutlet.