It also used a 500 ohm resistor on the output to drop voltage to 230 volts DC. The existing AC power supply had a SS bridge rectifier, 1HY choke and a dual section 50uF can type capacitor for a CLC filter. Interesting that the original were still in good condition without excessive leakage. I replaced all paper and paper oil capacitors. The new to me BC-348R has a new custom CNC machined front panel, S meter and an AC power supply installed by the previous owner. It's straight forward and can be done in a few hours.The BC-348 was my first SWL receiver in 1965. Mine were discolored and way out of tolerance. check the filament dropping resistors 84 and 85. If it goes it will take out the primary of the audio transformer (see pictures below).
be sure to replace the audio plate bypass capacitor 24-2. In particular (and this is for the Q model, but it should be similar to other models): You can check a lot of the resistors in circuit, and quite a few others by unsoldering either the resistor itself or a nearby component. Take the time to replace all the paper caps and check the resistors.
But for now, here are some pictures of my BC-348Q.īy the way, if you plan on actually using your BC-348 on the air…. Unlike the SCR-274N “Command” radios which were used for short distance air-to-air and air-to-ground communications, the “Liaison” radios were used for long range communicationĪnd, one of these days, when I have some time, I’ll expound upon that. Including the B-17 Flying Fortress and the B-29 Superfortress. The BC348 Series of receivers were part of the “Liaison” radios aboard numerous WW II era aircraft
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