30 Sep
2024
30 Sep
'24
11:51 p.m.
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(a)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