Another way to use them is to switch a series resistor out of the power supply input after a few seconds; that is good for capacitor-input filters where the inrush current is otherwise very high. The 5 second delay may be just that; it seems a bit short for the pre-heat delay.
paul > On Sep 30, 2024, at 7:39 PM, Bob Rosenbloom via cctalk > <cctalk@classiccmp.org> wrote: > > Tektronix used this type of tube in some of their later vacuum tube scopes. > Some audio amplifiers also used them. Can help improve tube life by keeping > the plate supply off until the tubes warm up. > > Bob > > On 9/30/2024 2:21 PM, Van Snyder via cctalk 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 >> > > > -- > Vintage computers and electronics > www.dvq.com > www.tekmuseum.com > www.decmuseum.org >