american flyer comet 475 b whistle or roar unit repair

474 and 475 were Alco A units in a "rocket" roadname. 474 was the power unit and 475 was the dummy unit. Operation of the air chime/diesel horn requires a generator tube and button assembly for activation.

Rich

The condition of the Diesel Horn looks good. I have attached the wiring diagram for the control button below. Note that all connections to the layout from the transformer variable post (7V-15V Post) must be made through the control button.

@richabr posted:

474 and 475 were Alco A units in a "rocket" roadname. 474 was the power unit and 475 was the dummy unit. Operation of the air chime/diesel horn requires a generator tube and button assembly for activation.

Rich

Thank you so much

@AmFlyer posted:

The condition of the Diesel Horn looks good. I have attached the wiring diagram for the control button below. Note that all connections to the layout from the transformer variable post (7V-15V Post) must be made through the control button.

Thank you

If you are getting no sound at all....You should hear a hum from the speaker when on the track. No diesel roar from that engine, I would look for a broken wire connection first.

@Chuck Sartor posted:

If you are getting no sound at all....You should hear a hum from the speaker when on the track. No diesel roar from that engine, I would look for a broken wire connection first.

The picture doesn’t show it having a roar unit, so the poster has to go and find a tube and base unit. Hopefully the tube will work otherwise it will need cutting into and cleaning up the contacts.

Portline hobbies usually has some good ones in stock.

Thanks every one for the advice