Found this in a Lionel “plain Jane” dummy B unit circa 1976, obviously not stock. Sounds pretty cheesy but better than nothing, I guess. Seems to be horn only, no bell. Just curious what it is.
Thanks...Rich
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Not sure why you think it's not stock, it looks a lot like stuff I've seen in that vintage locomotive. 
That could very well be. It was previously mounted with black foam double sided tape that disintegrates to the touch, much like with the SOS boards. Work looks a little shoddy, but I think you are correct! Thanks...Rich
That's an early version of the 600-8152-050 (8152-50) Horn Board, which debuted in 1981.
Lionel sold those separately in the 6-8190 Electric Diesel Horn Kit, made specifically to upgrade an F-3 B unit.
TRW
Interesting to hear...thanks TRW!
Yep, I remember the foam they used, I found many boards rattling around inside stuff with foam bits coming out every hole. 
The unit shown is factory installed.
I remember Ott sound systems came with foam that stuck to the frame. They were not bad. I used them in my Williams "little Joes". They made steam, diesel and electric sound systems. They were cheap and very popular in the 70s. Only problem was the second the power was cut, no sound. Don
What is everyone's opinion about modern double sided foam for fastening boards?
I usually fasten boards with the included foam tape and when everything has tested out OK, I supplement the tape with RTV.
I generally use modern double-sided foam to mount sound boards. No trouble to date.
Mitch
BTW, the B unit is newer than 1976, as that board did not debate until 1981. Probably around 1981-82. What road name?
I use the DS tape, I'll probably be gone before it fails.
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