SECTION FIVE
GLOBE MASTER 304TL MODULATOR
DESCRIPTION
The Globemaster 304TL modulator consists of the following stages:
Balanced microphone and line XLR audio input connectors, switchable on back panel.
6SJ7 microphone preamp
6SN7 first stage audio amplifier and phase splitter
6SN7 second audio stage driver
6L6G / 5881 third stage audio driver
304TL class AB1 audio output to 1.33 to 1 impedance ratio custom modulation transformer (rated 2.2KVA)
The high voltage power supply consists of a choke input, full wave rectifier (one pair 3B28’s) 3Kv (no load) 2.2Kv@500mA (measured) mounted on a steel plate below the modulation transformer.
MODULATOR TOP VIEW
MODULATOR BOTTOM VIEW
MODULATOR COMPONENTS LAYOUT
SCHEMATICS AND WIRING DIAGRAMS