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
> <[email protected]> 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
>
