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National Model 510-1B Amplifier |
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| This amplifier was made for National by the Valco Manufacturing Company of Chicago, probably just after WW-II. A wiring diagram that was found inside the unit shows it as using a 510-1B chassis. Whether National used this as the model number, I cannot say. It is a compact unit, about 15 inches square, and 8 inches deep, with a 10 inch electrodynamic speaker. |
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