Dx4 connection between a dx4 noise reduction unit and a TEAC 40-4 reel to reel. I don’t have the cable to connect the two so either I find out what this connector is and make a cable to fit or I replace the whole lot with a db25 or a 16 pin molex.
How is the audio connected?
I suspect you have a total of 8 audio connections between the tape machine and the dbx unit.
A long time ago, I sold dozens of modified DX4/8. They were not supposed to work with other brands of machines. The lack of control connection mutes all sections.
The mod was very easy, IIRC, it consisted in cutting one or two resistors, and that was it.
It left the mute transistors in circuit. Although not supposed to conduct, large peaks turned on the b-e junction zener, which resulted in asymmetric clipping. The full mod entailed removing the transistors, which allowed users to operate at +4 nominal.
The DX4/8
D seems to be a tad more complex, though, but a simple mod should be doable.
Remember, this was not done to fulfill any users wishes, just to prevent using these NR units, which were quite inexpensive, with other brand equipment.
The contract between Tascam and dbx is long obsolete now.