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.

In questo link sono elencati 18 modelli, di cui 10 con immagini e 10 con schemi.
Elenco delle radio e altri apparecchi della Morrow Radio Mfg. Co., Moradco; Salem (OR)