Here is where I am with this.
1. Replaced the diode with a 12V, 50W Zener Diode (based upon looking at every post on this forum that dealt with KW / Sound Activation button). Solid State 1N3311B ( Newark Electronics SKU # 10P4804)
2. Changed the asbestos coated nichrome resistor wire with a 1.5 Ohm, 25W, 5% Tol. wirewound. There was a debate as to whether or not a resistor was needed with a Zener so I opted to leave one in. Ohmite Part # HS251R5J (Newark Electronics SKU # 73AC6322)
3. Changed the 12v 10 A Littlefuse automotive circuit breaker (which appears to have burned out). I had soldered in pigtails so it was easy. Didn't replace the circuit breaker resistor wire.
No smoke yet from the transformer, but the button slows the 2026 down to stopping when the button is pressed as well as the whistle tender motor buzzing to try to start when it is pressed.
I may build my own button. Bought all the parts.
https://slsprr.net/features/SoundBlkProtect.htm
Keep throwing money at this problem. Good thing I am retired.
John
