Brought this around 2 years ago but never found/made time to check it out properly, other than a little work in this Thread :-
https://www.vintage-radio.net/forum/...d.php?t=169920
Checking it out properly now as want to sell it.
Circa 1970 solid state, single speed 4 track, mono recorder, very similar to the TK 141 with the addition of EOT (End Of tape) sensor, switchable manual/auto recording & Trick (superimpose) recording.
Loaded a 5 3/4" tape (max spool size) and tested the tape transport operation. Fast wind in both directions works very well from end to end of the tape, EOT operation works well but no Play as no drive to the Take Up table.
Found the drive belt from the flywheel to the Take Up table was broken.
Apart from the single break the belt from a distance looked OK but close inspection showed that it had serious cracks completely around the whole belt, very obvious when the belt is stretched.
Belt (round profile) measured around 2.3mm x 90mm ID, replaced it with closent I had, a new Sony 377 2mm x 90mm belt.
The tape counter belt also is very badly cracked, it does work but I will replace it.
Playback, pause etc now work well. Playback sound works OK but a big problem with the volume, the sound volume dramatically changes when tape is playing, any very light touch or disturbance of the board with the 3 slider controls can make the sound come and go.
Not sure yet if it is a slider problem, will try contact cleaner on them and check the soldered connections on the back of the board.
David