My National Panasonic tube AM/FM radio.
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Uploader Comments (CassetteMaster)
All Comments (23)
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I do have a tape recorder by National Panasonic it's a model RQ-421DS from around 1973.
The "National" brand was stopped in 2008.
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@CassetteMaster It may be also because nowadays FM broadcasters since the manufacture of that radio had increased their deviation along with the introduction of FM stereo. Again you can adjust the detector but it is touchy work requiring professional instruments to maintain linear audio during adjustment.
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@CassetteMaster The FM detector may need realignment, but you would need a low power FM transmitter modulated by a sinewave tone at maximum standard modulation, and an oscilloscope tapped off the audio output of this radio. The detector would consist of two RF transformers with a twin detector tube, the circuit is like two slope detectors 180 degrees out of phase, but if there is only one slope detector like some tuners have, there is nothing you could do about the distortion.
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Very common on the tube set for the capacitors to need replaced. they go bad with age and can cause undue hum. Caps arent expensive -- that sure is a clean chassis--!!
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真空管ラジオ
良い
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cool radio
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AM/FM in tube radio is great. I think that FM here in Australia come too late because none of my tube radios has it and unfortunatly local AM stations are complete crap so I don't listen to them.
BTW - even with the camera mic it's easy to hear that nice fat tube sound when the Beatles come on, isn't it amazing.
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May be more bad caps?
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Great presentation, I do love the sound of that radio. My only question at this point is, why would the AM sound clearer than the FM? Even when you used the AFC control, it still sounded like the FM wasn't tuning in properly, unless the antenna wasn't fully extended or attached.
Gary
musicman0150 3 years ago
I'm not sure what exactly is causing that.
CassetteMaster 3 years ago