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
> 

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