The 1971 owner's manual for a rare Fender 400PS. The most entertaining thing about it is the comment on the first page: "The amplifier should be operated in There was no mention on the manual cover ( which says 400 PS Bass Amplifier ) or in the guitar amp section of the '70 catalog about using this for anythingALL CAPACITORS ARE IN MICROFARAOS, 400 V MIN. 3 DC. VOLTAGES READ TO CHASSIS WITH NO SPEAKERS CONNECTED (VIBRATO ON). 2. ALL RESISTORS IN OHMS, -400 PS-. 400 PS Bass Amplifier '71 Fender Owner's Manual ; Price: $7.50. Item Number: FNDROM16. Manufacturer: Fender. Quantity: * Whole number only ; Fender 400PS Bass User Manual: Fender 400 PS (1970-1975) Fender® Bass Amplifier and Speaker Enclosure Owner's Manuals – Fender. Open the PDF directly: View PDF PDF .