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Old 10-20-2012, 06:24 AM   #61
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You are correct Jim, perhaps my title and labeling was misleading. The only time I remember a ground was needed was when I built my crystal radio in cub scouts, wrapping the toilet tissue coil and then attaching a wire inside our house to the radiator and my dad putting the antenna out on the roof resulted in hours of listening to out of town radio stations. This was before I had my first portable radio which was the size of a 12 pack!!
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Old 10-20-2012, 06:42 AM   #62
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This was before I had my first portable radio which was the size of a 12 pack!!
Did it have tubes?
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Old 10-20-2012, 07:25 AM   #63
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yes and a 9v battery, around 10 lbs
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Old 10-20-2012, 07:49 AM   #64
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I acquired an old Zenith from the trash. It used a couple of D cells for the filaments. and a rather expensive 90 volt battery for everything else. I was too poor to afford the battery just to see if it worked so I stripped it for parts. You're right, big and heavy.
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Old 10-20-2012, 07:51 AM   #65
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I acquired an old Zenith from the trash. It used a couple of D cells for the filaments. and a rather expensive 90 volt battery for everything else. I was too poor to afford the battery just to see if it worked so I stripped it for parts. You're right, big and heavy.
Sure it wasn't a 9 v- I have never heard of a 90 v battery/
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Old 10-20-2012, 08:35 AM   #66
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Sure it wasn't a 9 v- I have never heard of a 90 v battery/
Yes, the tube plates required large voltages to get those thermionic emissions going. If yours had a 9 volt battery it was for the filaments. There would be a second battery lurking somewhere. At least 45 volts. The Japanese took the transistor, invented at Bell labs, and gave us 9 volt " transistor" radios. This in turn gave us Gidget, the Beach boys, and much later, cell phones.

RadiolaGuy.com : tube portable radio: portable tube radio
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Old 10-20-2012, 09:59 AM   #67
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The 90 volt battery was referred to as the "B" battery, and as Raz said, supplied plate voltage for the tubes. There is a photo of a typical one in the middle of This PDF, which also shows how to build one for antique radio fans...
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Old 10-20-2012, 11:03 AM   #68
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Wow, I never realized there was another battery.
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