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
> 

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