HP6200B Power Supply 2.4v diode GD8-001 Replacement

[VictoriaGuy]

Working on my HP 6200B power supply, I've read the discussions here at eevblog.

There was mention of the GD8-001 diodes (CR8,9,31,and possibly 35) which are listed as 2.4v Si diodes in the Parts List.
Wiser folks will know what these are; I didn't. They are not zeners, but stabistors (3 diodes in a package). For a quick substitute the suggestion here at eev was to solder together 3 diodes, and that would work.
There are a few different manuals online for the 6200B, and one of them lists the replacement for the GD8-001 as the 1N4830 Stabistor.
http://www.digitroncorp.com/Documents/Datasheets/1N4156,-1N4157,-1N4453,-1N4829,-1N4830,-1N5179,-MP.aspx?ext=.pdf
It looks like the Microsemi MPD300 would also work as a replacement.
Luckily, those stabistors are OK in my power supplies, so I don't have to track down a source.
Hopefully this note may help the next person find info on the GD8-001 diodes for the HP6200B.

[sequoia]

It would seem "stabistors" are all but extinct nowadays?

What would be best replacement (modern component) for these? Is there "better" low voltage zener diodes nowdays or diodes that achieve similar stability as these stabistors used to provide?

Reading old specs for 1N4157 (or MPD300), which seem very close equivalents to the "HP" GD8-001, it would seem these were touted to be better/superior (in dynamic impedance) to low voltage zeners and provide higher tolerances than individual diodes (back in the day)....

[SeanB]

TLV431, as you can get it to any voltage from 1V24 to 6V easily. TL431 if you are happy with 2V495 as a voltage. Low dynamic resistance and a lot better than any low voltage zener for the price, except at 6V2 where you can get a decent zener with reasonable specs. Just be aware of the pinouts for the different packages.

http://www.ti.com/lit/ds/symlink/tlv431.pdf

http://www.ti.com/lit/an/slva445/slva445.pdf

[robert_]

Just be careful the 431 can oscillate depending on its operating point and load impedance...
Also, some 431 variants (esp. lower current versions) cant read their datasheet and still oscillate when they shouldnt according to the graph.