MINOLTA - Converting minolta SRT battery

Practical conversion guide for updating the Minolta SRT film camera to use modern Silver Oxide batteries instead of discontinued PX13 or PX625 mercury cells. The manual explains the core technical approach: installing a 1N5711 Schottky diode in the battery circuit to step down voltage from 1.6V to 1.35V, allowing readily available '76' Silver Oxide 1.5V batteries to effectively replace the original mercury power source. The parts and tools list covers a soldering iron, the specific diode, insulating tubing, and battery specification. The 18-step conversion procedure walks through bottom cover removal, contact cleaning, careful unsoldering of existing connections, diode installation and securing at both leads, thermal insulation techniques, and reassembly. Technical notes address diode function and electrostatic discharge safety during soldering. The guide includes side-by-side photographs of all three battery types (original mercury, Silver Oxide with O-ring, Silver Oxide with plastic adapter), detailed assembly views, and a schematic of the meter circuit after modification. The entire conversion takes roughly one hour and applies to related Minolta models including the SR-7. Essential for SRT owners who need a working light meter without relying on scarce or problematic older batteries.