Jazz Bass Wiring Kit with Blend Control for J Bass | eBay This high quality wiring kit is for a Fender Jazz Bass or similar model with 1 volume, 1 blend, and 1 tone control. Blend controls the balance between the 2 pickups.Seller Rating: 100.0% positiveLocation: Davenport, IowaShipping: Free jazz bass wiring | eBay Find great deals on eBay for jazz bass wiring. Shop with confidence. Skip to main content. eBay Logo: Jazz Bass Guitar Wiring Kit WITH BLEND SETUP CTS 500K Pots Orange Drop f See more like this. Jazz Bass Wiring Kit CTS Solid Shaft f 225P Pure Tone Full-Contact Jack.