3 BR-5 Converter 3 BR-5

The Morrow 3 BR-5 converter covers the 10, 20, and 75 meter ham bands.  A 3-gang variable capacitor tunes the RF amp, mixer, and oscillator. It was designed for mobile ham band reception using an automobile radio as a fixed IF at 1525 KHz. The converter uses a 6AB6 as RF amplifier, a 12AT7 as oscillator, a second 6AB6 as mixer, and a 6AL5 as noise limiter (to reduce impulse car ignition noise). Power requirements are for 200 to 250 Volts B+ at 20 to 25 mA supplied from an external source, typically the car radio itself, and 6 Volts for filament power. The filament supply can be changed to 12 volts if a 12 volt pilot lamp and a 12AL5 are substituted and the remaining filaments jumpered for series connection.  The set is similar to the 5BRF but covers fewer bands.

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