Fender Vintage 1-Button RCA Footswitch Vintage 1-Button RCA Footswitch Genuine Fender Vintage 1-Button RCA Footswitch works with the following amps: Princeton, Vibro-Champ, (Original) Fender Reverb (All vintage amps with a single foot switchable on/off function requiring RCA connectors) Fender part: 099-4050-000 Genuine Fender Vintage 1-Button RCA Footswitch works with the following amps:Princeton, Vibro-Champ, (Original) Fender Reverb (All vintage amps with a single foot switchable on/off function requiring RCA connectors)Fender part: 099-4050-000