On 9/30/24 21:03, Bob Rosenbloom via cctalk wrote:
On 9/30/2024 6:31 PM, Jon Elson via cctalk wrote:
On 9/30/24 16:23, Paul Koning via cctalk wrote:
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).
Another place they were used (but I think 60 second
delay) was in the IBM 2314 disk system, where these
delayed loading the heads until the drive had been
spinning for 60 seconds or so.
Jon
Now that's an actual antique computer application, though
I'm surprised they didn't use a solid state implementation.
Bob
The IBM 2314 was REALLY low tech. There was almost no
electronics in the drives! They has a read amp, a write amp
and a hydraulic "stepper motor" with mechanical detents that
moved the heads in response to step in and step out pulses
from the control unit.
IBM did know how to distill things down to the absolute
minimum. Remember, this was developed in the early 1960s and
first shipped with the first 360's in 1965.
Jon
