One application for devices like that would be vacuum tube power amplifiers, to delay the high voltage power supply until after the heater current has been on for a bit.
paul > On Sep 30, 2024, at 5:21 PM, Van Snyder via cctalk <cctalk@classiccmp.org> > wrote: > > > I have two SPST time delay 12-volt relays packaged like vacuum tubes > with octal bases, Amperite models 12N010 (ten seconds) and 12C5 (five > seconds). > > They're in their original boxes. > > I have no idea what devices used them. > > It seems a shame to throw them in a recycle bin. > > Does anybody want them? > > Van Snyder >