Quote:
Originally Posted by cpaharley2008
Sure it wasn't a 9 v- I have never heard of a 90 v battery/
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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.
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