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The polar pattern switch is located on the power supply allowing for easy sound comparisons
The in and output is transformer balanced
The circuit used for the power supply is also similar except for adding a zener diode to assure the voltage and current stable
A simple but effective
for each production run of 50 pcs GA-47 units
Pre-73 DLX MKII The polar pattern switch isThe PRE 73 DLX MKII is a one channel vintage style microphone , line and instrument preamplifier. The signal path uses only discrete components like resistors, capacitors and transistors. The line and microphone input and the line output are transformer balanced, using three different transformers, each one optimized for its purpose. This is the way audio components were built before integrated circuits became available. The subjective sound quality