4 The PORTASTUDIO 414 MKII is. The PORTASTUDIO 414 MKII is a 4- track " Multi- track Master" cassette tape recorder and a full- function mixer with 8 inputs/ stereo outputs including. P N Voltage / Current / DESCRIPTION DI1KV2. 5 0 A General replacement diode used in Fender and other non- tube rectifier circuits. Music Equipment Manuals and Documentation.