I've had this GG1 since it was new and ran it with a postwar ZW on the holidays at my shop for the customer's kids. Haven't used it in about three years and recently sold it to a guy I know with a TW transformer I reconditioned and upgraded with a diode for the whistle control . When I tested it with my postwar F3 the F3 horn works fine but the GG1 horn only chirps. Would appreciate any suggestions. Thanks!
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