Sylvanias european american receiving tube replacement guide stated1056 1 61 which i believe signifies january 1961 the guide is in good condition but does have light wear and soiling and has yellowed slightly. Sylvanias european american receiving tube replacement guide inc sylvania electric products on amazoncom free shipping on qualifying offers. Vacuum tube and valve cross reference sub substitute substitution equivalent and replacement list this list is constantly and perpetually under construction. In addition to the data i have scanned and posted if youre looking for data on a particular tube you should visit tsdl on duncanamps website or franks tube data. This manual tells what radio receiving tube will substitute for another and work as a replacement if no replacement is shown for a particular tube number there is no replacement and you must use original tube number to replace a defective tube
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