Re: Philips N4450
I wrote several of the messages in that thread...
The N4418 is similar to the N4510 but has power amplifiers and speakers built-in. The N4510 is line level and headphone output only. Both are 3 motor, 3 head machines, only run the tape left-to-right and have 6 flip-flops (2 boards of 3 each).
The N4450 is the big one, takes 10.5" spools. It has power amplifiers (but no built-in speakers). 3 motors, 6 heads. Runs the tape both ways with autoreverse. 8 flip-flops.
There's a monostable multivibrator in the autoreverse circuit of the N4450 that uses an NPN and a PNP transistor, although both are silicon (BC147 and BC157 originally).
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