FireAlarmFan, good job with the Gamma and the Kwikset! I just watched the Kwikset bid and can’t wait to see the Gamma vid! Also, those 120VAC gentexes came in plug-in models and my school has the 24v versions in the old building
https://www.youtube.com/watch?v=zN0t7oXamBk Here’s the video.
Nice Kwikset! You could probably use a 12 volt DC power supply to power it to test it, then use a grill lighter a few inches below the sensor to provide a source of open flame to test it. It would probably be pretty sudden and loud though.
I was at a resort the other day and saw a gem. A BRK 79R. This was the first time I recall seeing one knowingly, and I recognized it right away. It had the 76RC’s round silver sensor, and I believe the newer single hole horn. It had its battery still connected. Here’s a pic.
I got the Gamma today. It’s an F227.
Photo Storage 
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Back
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Guts.
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Sensor - Just your normal Am241 sensor, no gamma radiation here!
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Label.
I have a video of getting it, I’ll start editing that now.
Very cool! Looks like it has the same sensor as the earliest GE Home Sentry series did.
Here’s the video.
And I agree this should be stickied.
Really rare and cool alarm. Watching the video when I get the chance.
Here’s a SUPER rare alarm that I’ve been keeping top secret: the transitional model First Alert SA76DR! It is quite the find.
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That is the rarest First Alert I’ve ever seen! I found it interesting that it has the round sensor and the piezo horn with the central hole, but it has the SA76RS’s PCB shape, with the battery connector and clip turned to the side rather than straight in front of the PCB like in the SA76RC.
Here’s something strange I found for you guys to take a look at:
A Whelen portable smoke detector with an ESL detector and a strobe.
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I second Roberts motion.
Pay attention to the last half of the video, and it explains everything 
Oh …lol! I can’t believe I didn’t watch the rest of the video.
Hey, sometimes you just don’t have time, no worries.
It’s funny how you could swap pre 80’s BRK boards. Some of them anyways.
There was a SA76RS mobo with the 76RC’s sensor. It’s in this video.
There’s also some other semi-rare alarms/PCBs.
After thinking about it, the only other alarm with a light and EM horn I know of was branded as Wells Fargo (unsure if it had any relation to the financial institution). It was basically a Pyrotronics unit, looked similar to the one depicted on this button
Also take a look at this picture.
http://www.ebay.com/itm/1977-Press-Photo-Smoke-Detectors-/390973593897?pt=Art_Photo_Images&hash=item5b07d79929
I’ve always wondered about those nearly impossible-to-find SA76RS PCBs with the round sensor and the horn and sensor flipped. I wonder if they all have a pulsating alarm pattern.
Alright, let’s see…
On the wall:
6: A Gillette model 929 (batt. operated), 5: a GE home sentry (can’t tell if it’s 9v or 12.6v), 4: I’m not sure, but looks like an early ESL model, 3: a Guardion FB-1, 2: idk, looks REALLY rare, 1: Sears rebranded SA76RS
On the ceiling: another one of those ones that I think is an ESL, I think that other one is a BRK SA769AC
At my house we used to have a GE home sentry 9v smoke alarm
Woahh that BRK board is rare! Especially since it has the 5/6 squealer.
And, that pic from the 1977 photo with the old ESL alarm: it is actually an ADT model. To my knowledge. It has the black Star buzzer and is a photoelectric.
Interesting. It looks simillar to an early ESL alarm.
For anyone interested: There’s a First Alert SA76RC for sale on EBay right now:
http://www.ebay.com/itm/Lot-of-3-Used-Smoke-Detectors-/121487062057?pt=LH_DefaultDomain_0&hash=item1c49317429
It comes with a Family Gard 83R and a Kidde-Lifesaver 0915. I don’t think i’ll be able to buy it.
Ooh! That First Alert looks like one we had in our old home (in Maine).
If it stays cheap enough, I might buy it for sentimental value. lol