National AT-290 donor radio from 1959 |
After spending many hours trying to locate a circuit diagram that matched the chassis I gave up. I think the cabinet was from a different model to the chassis inside and many components had been removed in a bit to restore it in the past, so I decided to install another chassis yet again and this time though to save cost I put a National transistor from 1959 that had a badly damaged cabinet so was no great loss.
Old car speaker used to replace original |
The original loudspeaker was missing it's cone so I fitted a similar size Philips car speaker in it's place using Aroldite to attach to the baffle ( baffle to narrow for crews) That too a couple of attempts due to the chassis hitting it when re-inserted. Next job was to remove all the no essential parts from the main chassis leaving the tuning capacitor.
Chassis fixed in place by L shaped bracket |
The Nation radio was MW & SW the same as what the dial displays so I just removed the 2 x 330 pf tuner wire (Oscillator and RF connection, and earth). I fitted the National via an 'L' bracket I made using the old tuner hole fixings.
Old chassis after drilling out valve bases and IF cans etc., |
The band switch was far too integrated with the National to be easily removed so I gave access to it from the rear of the set. Band switch on Fada was converted into a Local/Distant switch. The volume control was replaced with an on/off 47 K ohm pot I found in a used box along was 3 Bakelite knobs I brought from a large collection recently.
Dial with 3 LED's at top |
The original 6.3 volt bulb was removed and 3 x LED's in series with a 1.5k resistor and across the 9 volt rail via the on/off switch negative feed. The missing back was traced out on a sheet of plastic and cut slightly smaller to fit inside as the back bolt holes were not recessed, all looked OK, I fixed an old SW aerial rod to the back and she was a runner again.
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