OK, just checked the specs for the Cisco PIX 506 ADP-30RB supply. As a reminder since it was a few pages ago the following quote was from the manual (I verified it as a direct quote, no typos):
The Timeline PS is:
"Power Supply Mains
Input 100-250 VAC at 50/60 Hz
15 W nominal, 30 W max.
Output +5 V, 3A max
-12 V, 3A max
+12 V, 1.0A max"
Very important: Do not try to use a supply for a PIX 506E ADP-33AB (the lower current requirement successor to the PIX 506) as the base of a mod for the Microlynx power supply. Here are its specs:
"Output: +5Vdc @ 4A, +12Vdc @ 1A, -12Vdc @ 0.1A (100mA)"
The PIX 506 ADP-30RB specs:
"Output: +5Vdc @ 3A, +12Vdc @ 2A, -12Vdc @ 0.2A (200mA)"
The ITE #UP30430 specs (miroslav's supply):
"Output: +5Vdc @ 3A, +12Vdc @ 2A, -12Vdc @ 0.3A (300mA)"
The Mean Well #P50A13D-R1B specs (1st supply linked to by the OP):
"Output: +5Vdc @ 4A, +12Vdc @ 2A, -12Vdc @ 0.5A (500mA)
OK, so none of the supplies above quite get up to the specs in the manual, but since the ITE version may be completely unavailable (I haven't found a source for it, anyway) my advice would be to get a supply that gets as close as possible to factory specs as far as its current delivery, which appears to be the Mean Well version, especially since it comes with an apparently pin-compatible DIN 5 already attached.
The very best means of getting a replacement supply for the Microlynx would be to follow the manual's specs to the letter, as we don't have any techs or engineers to consult if we should have mysterious problems with our aging units, particularly if there is a potential danger to certain irreplaceable components should the supply sag too much from excessive current demands (see below).
Any supply too far down on the current delivery options and you're likely to have problems (such as the chattering relay syndrome miroslav mentioned, or worse- if the sagging supply should happen to cause an irreplaceable EPROM to fail).
Last point, until or unless I can get a look at the schematics for the System Unit, I can't say for sure whether some internal circuitry is utilizing the +12Vdc or -12Vdc "rails" for something critical, or whether it was only meant to feed the pins mentioned on the transport to interface with the outside world.
Anybody have copies of schematics for the boards they'd be willing to share or sell? Please let me know if you do.
In the mean time, I did have an in-depth look at the cable schemos (thanks once again miroslav!), and so far here are the only cables that utilize the 12V rails for external cabling, which might be more critical to have adequate supply current delivery for:
1. JVC Type B-Y(70D112A).pdf utilizes pin 37 (+12Vdc) tied to pin 8 (PULLUP COM, also described as Pull-up Common in the manual- strange but true)
2. Studer A-80(70D084B).pdf utilizes the same pin 37 tied to pin 8 as the JVC Type B-Y above
Of course, as I have discovered to my chagrin, the pdf cable schemo files miroslav was able to share with us in the following thread are incomplete (particularly for the one connection I'm left hoping to make- to an Alesis AI-2 - anybody have this or a cable for that unit?):
https://homerecording.com/bbs/gener...and-gear/micro-lynx-tape-deck-daw-352911/new/
Of Note: I don't know whether a sagging supply fed to the outside world could cause an unexpected problem with the units it is attached to, but I suppose it is conceivable that an absolute failure of our Microlynxes could cause collateral damage to some interfacing component of let's see- one of our expensive to repair or irreplaceable ATR's (heaven forbid!).
Anyway, that's hopefully some food for thought as far as replacement Microlynx power supplies are concerned.