Antique smoke alarm

[wa2ise]

Had to replace the old smoke alarms. This one really old.

No it didn't actually use a tube, but it did have a 7 pin tube socket for who knows...

[markdi]

you gave in too fast

I would have waited a while before saying it did not use a tube

[Tom Albrecht]

Always good to have an antique smoke detector to go with your antique smoke generators.

[Username1]

Originally Posted by markdi

you gave in too fast

I would have waited a while before saying it did not use a tube

Yah, really........

.

[Electronic M]

I've got a 70's SS receiver/8-track unit, and the 8-track connects to the tuner/amp chassis with a 9 pin tube base/socket.

[MIPS]

I see them from time to time in old businesses and homes but pass them up simply because I never have a screwdriver handy to walk away with it. I remember being at a friends place once and hearing a physical buzzer going off every so often because the batteries in the unit were dying.

[Electronic M]

The original one to my house is about that old, and still works. We got two new ones so it is now my basement work area detector.

[bgadow]

The first ones we had as a kid in the late 70s were GE's that used a big 12.5v cell. I remember tagging along with Dad to the local GE dealer, gazing at the latest TV sets while he bought one of those expensive Mallory Duracells-they kept 'em in stock behind the counter.

[Captainclock]

I wouldn't put it past that Smoke Detector to of had a vacuum tube in it for part of the circuit, seeing as from what I can see of the circuitboard there are no transistors in there just capacitors and resistors (which is all a vacuum tube circuit needs to run) plus if its running off of AC like most hardwired Smoke detectors do you already have the 120volts it needs to power the circuit, more than likely it has a silicone diode for its recifier circuit and then the tube is probably for the control circuit to make sure the smoke detector goes off like it should when it detects smoke, more than likely on the smoke detector chassis somewhere there's probably a tube diagram that tells what kind of tube it needs to power it.

This kind of reminds me of an old Slave Clock I saw at the antique store once where the clock's correction circuit was powered by 3 vacuum tubes (not somehthing you'd expect to find in a time only wall clock but then again the slave clock's correction circuitry had to be powered by something right?)