How to tell if your TV is real old. For this little article I am confining myself to sets with CRTs,I will let someone else explain mechanical scanning disc TVs. Did you ever wonder why TV's channel selectors...
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A very easy way to test a 1920's horn or cone speaker is to use a battery (weak 9 volt or a D cell) touch the terminals of the battery with the leads from the speaker, if you hear a click the driver and cord...
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