Dating valco amplifiers

This page contains details about the 1963-1966 Magnatone Custom Series amps.For an overview, see Magnatone Custom Series, or for a history of the Magnatone amps from 1947-1977, see The history of the Magnatone brand.Early Custom's were build without the interlock switches, although the interlock was on the schematic inside the amp.

If what follows doesn't provide you with the date code information you need, hit and you'll likely have your date code issues solved in no time.Speakers, pots, and transformers all carry a six or seven digit code that contains a three digit EIA manufacturer designation followed by a three or four digit date code.Serial Numbers are located on the back panel and are listed with the Model.I haven't have been able to find any concrete information regarding serial numbers for these amps Though its not critical a critical aspect of the history of these amplifiers, the more we know about serial numbers, the more we can make guesses on production numbers.

Also, the badge plates were different on the very early Customs, eventually they were produced with the large "M" (below right).It is possible that the first models had yet a different plate than the style of the early M7 plate below. are unknowns but it might have been due to re-order supplier issues for the standard emblems during the bankruptcy of 1964-1965.


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