It's a time-delay relay for a tube radio or transmitter, isn't it?My siren timer is a vacuum tube timer.
When an element inside the tube heats sufficiently, it opens it's contact in 180 seconds. Once open, I desiged the circuit to reset.
I don't know. Looks just like a vacuum tube with a multi-pin base.AllSafe wrote:It's a time-delay relay for a tube radio or transmitter, isn't it?My siren timer is a vacuum tube timer.
When an element inside the tube heats sufficiently, it opens it's contact in 180 seconds. Once open, I desiged the circuit to reset.
Yeah, exactly; it's a time-delay relay, which is used to delay the application of B+ voltage while a tube circuit is being warmed up. It's not a vacuum tube because the relay doesn't sit in a vacuum, but rather an inert gas.Robert Gift wrote:I don't know. Looks just like a vacuum tube with a multi-pin base.AllSafe wrote:It's a time-delay relay for a tube radio or transmitter, isn't it?My siren timer is a vacuum tube timer.
When an element inside the tube heats sufficiently, it opens it's contact in 180 seconds. Once open, I desiged the circuit to reset.
Thought it simply a cheap easy timer from the 60s before solid state timing circuits were developed.
It is a time-delay device.
Interesting! Thanks.AllSafe wrote:... It's not a vacuum tube because the relay doesn't sit in a vacuum, but rather an inert gas.
Kid, you can figure all of this stuff out! Follow wires and draw up you own schematic (wiring diagram).hobbeekid wrote:wooosh! over my head,I could'nt even begin to explain how these timers work let alone build one from scratch. I have ar timers myself and I have no idea how they work inside,never bothered to find out, just somthing to look at.You definitly have skills Eric.
Radio transmitters, and certain amplifiers which often use very high B+ voltages. It helps with the tube life.Robert Gift wrote:Interesting! Thanks.AllSafe wrote:... It's not a vacuum tube because the relay doesn't sit in a vacuum, but rather an inert gas.
Why not a vacuum? Would that not be easier than an inert gas?
Did I see Getter in it? Guess not.
To determine gas, I'll have to look at the spark when the contact opens.
I never knew that filaments need be up to temp before B+ was applied.
180 seconds is a LONG time!
What kind of applications?
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