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| nitrogen_widget:
--- Quote from: DaOld Man on April 23, 2021, 02:38:17 pm --- --- Quote from: nitrogen_widget on April 23, 2021, 12:24:31 pm ---vacuum tubes? --- End quote --- Yes --- End quote --- cool. you might need this. https://tubedepot.com/pages/tube-comparison-tool |
| Robbbert:
You've poked me in my favourite hobby damn you. If that schematic is correct, then you have a TRF radio, which means a whole bunch of tuning knobs to adjust whenever you choose another station (it's AM band only). Some really expensive TRF radios had the adjustments linked up with a chain or some other means. If you're planning on powering it up, make sure you replace all the capacitors with modern equivalents with suitable voltage ratings. Then check the values of all the resistors and replace as needed. The radio is so old that even the insulation on the wires could have rotted away, so then you'll have to replace all of them too. Don't forget the power cord - the insulation is probably rubber which will have perished ages ago. If you just plug it in without checking, you'll either destroy all the irreplaceable parts, or you'll start a fire. Be very careful with the valves (tubes). If you break one, then you're unlikely to find a replacement any time soon. The schematic doesn't show the power supply - I'm assuming it's mains powered, but perhaps it runs on unobtanium batteries. AS for its worth - it would have been pricey back in the day, but whether that excites anyone today is another matter. Good luck? EDIT: I see the photo only shows 3 knobs (which appear to be missing). So I'm not at all sure the schematic matches this radio. Perhaps you could look inside and see what valves are there, and how many. |
| BadMouth:
--- Quote from: Robbbert on April 23, 2021, 08:51:52 pm ---You've poked me in my favourite hobby damn you. --- End quote --- I picked up a Wards Airline at a thrift shop for $30 with the intention of installing a bluetooth amp to play old time radio streams. But everything was there, so I stopped after refinishing the cabinet and vacuum molding a new dial cover. It is just decoration at this point. I am not sure how much AM radio I would listen to anyway. It does do shortwave which might be interesting. Someone cut the power and speaker wires off of it. I am not sure if they did this to get the copper or to prevent a dangerous situation of it being plugged in. Is there any way to tell if someone already borked it by trying to power it up without replacing the caps? It would be cool to see the cathode ray tuning eye glow. |
| Robbbert:
That looks quite nice, although newer than DaOldMan's radio. There's a knob missing, but it has push buttons for tuning, like a car radio. I'm jealous. I can understand cutting off the power cord, but the speaker? That's weird. The trouble with American radios is they often don't have a power transformer, with the valve heaters simply wired in series. You can get electrocuted just by touching exposed metalwork. My collection is mostly Australian radios, and they always have a transformer, and the chassis can (and should) be earthed. Much safer. If I had that radio and lived in your country I'd certainly be looking to repair it and reconnect the wires. Tuning indicators look cool, with a lovely green glow. Unfortunately the old type (such as yours) tend to have a short life. They go dim and eventually don't glow any more. Further, nobody in the world makes replacements. It's a sad situation. EDIT: actually you can get a valve called 6E5C from Russia, but you might have to rewire the radio a bit to get it in. |
| Vigo:
--- Quote from: BadMouth on April 24, 2021, 10:13:16 am ---I am not sure how much AM radio I would listen to anyway. --- End quote --- I would probably try to get a low power AM transmitter and a cheap MP3 player and put them in or near the radio, left always on. Then I would fill the MP3 player with early radio shows and music and pick it up as if it was an actual station. Heck of a cool piece if you can turn on Some Dick Tracy Show or Duke Ellington whenever you turn the radio on. |
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