Source for Extinct IC

Wow, 30 volts dropout!

I realize that they went

Resistor+zener+follower?

Maybe a depletion-mode fet, just for fun?

John

NTE catalog, TV voltage reg modules. cant remember the number, but when I worked for a MRO parts supplier, we stocked them as part of the mandatory stock. (and never sold a one!)

the

Have you looked at the Sanken STR30000 series?

I gues it is the same as from ST (SGS-Thomson). Isn't it?

I used to make a PCB "plug-in" replacement with same lead spacing, made to mount on a heatsink to plug into main PCB vertically. Made about 2100 of them and broke even at $10 each. I quit while i was ahead. Designed and made both positive and negative supply versions.

The dropout on the ones i made, if i remember correctly was about 9V.

Many thanks for the suggestions. The VB408s are needed for repair jobs. The LR8 with an add-on current booster is a possibility, although the overcurrent protection is a problem, mainly due to lack of space for many additional components. I've considered Win Hill's suggestions for increasing the current capability of the LR8. Could try stuffing an add-on board with the current boosting circuitry.

I also found the TL783 from TI that is a possibility. It has the current capability, but the max Vin isn't spec'ed in the datasheet; only the Vin/Vout differential (125V). Also will have to provide some additional minimum load current; its Imin is 15 ma!!! The normal operating parameters seem to be within the TL783's capabilities, but any guesses as to whether it could survive a short to ground on the output with