I had to finally look up what a field coil speaker was. It uses all electromagnets. No permanent magnet. I enjoy these videos more that most stuff on TV. :)
I love the motor boating on this set brings back happy memories of my restorations. I like the dot display on the signal generator quite a refreshing change from seven segments display. Thanks Regards AllTheGearNoIdea
My guess is that this set has an open bypass capacitor, one of the paper ones, it's also supposed to have two 5 mf electrolytic filter caps in the power supply and not just the one, unless it's the later version which uses two 4 mf caps, having the second filter cap missing could also cause the oscillation.
Nostalgia Air dot org a diagram for a Packard Bell model 35, there is an early model and a late model listed. It states that the earliest models used 2.5 volt tubes and did not have a tone control.
The volume control circuit was used a lot back then the wiper was ground the line drawn on the schematic means the control has a stop built in that in this case is 300 ohms. The way it works is when the volume is at minimum the primary of the antenna coil is shorted by the control and the cathodes are at maximum bias, as you increase the volume the antenna coil is less shunted to ground and the cathodes are more grounded increasing the gain thus making the radio more sensitive.the controls stop will only allow the cathode circuit to resistance to go to 300 ohms. These radios even though super-het did not have AVC, these were made to sell cheap and a lot of compromises were made.
One other thing that hasn't been said, (I don't want to be redundant). As far as resistors go on these old schematics; yes, M=K ohm. But say if it is really 1Megohm, it will read "1 MEG", (written on the schematic). I really like the old "Body, End, and Dot code system". I think it really looks cool in these old radios. I'm also surprised the are not "dog bone" resistors. And I'm REALLY surprised they are all within tolerance. That's almost unheard of! Have fun! Tom
Those resistors use the Body, End, and Dot code system, you read the colour code in that order, the colours represent the same numbers as the normal striped ones. Using a letter "m' was a practice some manufacturers or draftsmen used in the old days, it's short for mill or thousand. The resistors that say .5 next to them are 1/2 megohm, it's crazy the way they used to draw schematics back then, but I think that was before they established an industry standard through the RMA now EIA.
I had to finally look up what a field coil speaker was. It uses all electromagnets. No permanent magnet. I enjoy these videos more that most stuff on TV. :)
I love the motor boating on this set brings back happy memories of my restorations. I like the dot display on the signal generator quite a refreshing change from seven segments display. Thanks Regards AllTheGearNoIdea
When a kid in the mid fifty’s I would lay in bed and tune the radio off channel making all those other-worldly sounds!
My guess is that this set has an open bypass capacitor, one of the paper ones, it's also supposed to have two 5 mf electrolytic filter caps in the power supply and not just the one, unless it's the later version which uses two 4 mf caps, having the second filter cap missing could also cause the oscillation.
Interesting. I have never seen a radio with a speaker behind the tuner face.
Nostalgia Air dot org a diagram for a Packard Bell model 35, there is an early model and a late model listed. It states that the earliest models used 2.5 volt tubes and did not have a tone control.
The volume control circuit was used a lot back then the wiper was ground the line drawn on the schematic means the control has a stop built in that in this case is 300 ohms. The way it works is when the volume is at minimum the primary of the antenna coil is shorted by the control and the cathodes are at maximum bias, as you increase the volume the antenna coil is less shunted to ground and the cathodes are more grounded increasing the gain thus making the radio more sensitive.the controls stop will only allow the cathode circuit to resistance to go to 300 ohms. These radios even though super-het did not have AVC, these were made to sell cheap and a lot of compromises were made.
this is good.kind of trippy not easy fix
tuned in and enjoying
i enjoyed watching this video,
looks similar to that 1935 detrola
One other thing that hasn't been said, (I don't want to be redundant).
As far as resistors go on these old schematics; yes, M=K ohm. But say if it is really 1Megohm, it will read "1 MEG", (written on the schematic).
I really like the old "Body, End, and Dot code system". I think it really looks cool in these old radios. I'm also surprised the are not "dog bone" resistors. And I'm REALLY surprised they are all within tolerance. That's almost unheard of!
Have fun!
Tom
Those resistors use the Body, End, and Dot code system, you read the colour code in that order, the colours represent the same numbers as the normal striped ones. Using a letter "m' was a practice some manufacturers or draftsmen used in the old days, it's short for mill or thousand. The resistors that say .5 next to them are 1/2 megohm, it's crazy the way they used to draw schematics back then, but I think that was before they established an industry standard through the RMA now EIA.
Disco inferno it it caught fire!
How is that detector biased because the grid is open circuit. Have you checked the dc path to ground of the detector grid circuit.
bet it had a loop antenna. when i disconnect the loop from on of my radios it motorboats
My arvin 417 is setup the same way as far as the volume control. TRF setup..
nice old radio, a little pesky on signal!!
20dbm is 100mW.
0:19
So....when you aren't outside working at home, are you in your bedroom? I'm just curious. I prefer to work in my shop.
I work in the lavatory, each to their own.
Martin D A The video of my old radio was done on my bed. LOL..........A lot of good things happen in bedrooms. Haha