The Michael-Hull amplifiers can be narrowed down to a date of manufacture between 19. Transformers: Acrosound (878), Stancor (138), Electrical Windings (682), Todd Electric Co. Some common manufacturer codes for parts used in Ampegs include: It is important to note that parts do not always contain EIA codes, especially those parts from the late 1940s and early 1950s.
Ampeg cabinet serial number lookup code#
The code usually consists of 6 or 7 digits such as 137634 where the first two or three digits is the EIA code for the manufacturer (137 denotes CTS), the fourth digit and sometimes fifth digit denotes the year (in this case it could be 1956, 66, or 76), and the last two digits denote the week of the year. These codes have been used on components including potentiometers (pots), transformers, capacitors, tubes, and speakers. The code contained information regarding the manufacture and date of production. Shortly after World War II, American electronic component manufacturers began to stamp a semi-standardized code into the parts they produced. Therefore, do not poke around in your old Ampeg if you are unfamiliar with amplifier electronics or their operation.Ī brief summary of the EIA system follows. WARNING: Ampeg amplifiers, especially the high-powered amps such as the SVT and V-series, contain lethal voltages even when unplugged and turned off. Of course, these codes are only applicable to original components, not replacement parts. These codes can be found on speakers, transformers, pots, capacitors, and multi-section electrolytic "can" caps. Each group uses a unique serialization scheme that can be used to assist in dating the amps, but in many cases, it is the features and characteristics of the amps that determine the year of manufacture.Įlectronic Industries Association (EIA) codes can also be very useful for giving clues as to an amp's age. Click here for information on ordering this book directly from the authors.Īmpegs can be divided into six distinct groups for dating purposes: pre-1953, 1953 to mid-1965, early 1965 to 1969, 1969 to 1979, 1981 to 1984, and post-1984. The book contains, in addition to an in-depth history of the Ampeg company, more useful technical information on the variations in Ampeg amplifiers, including color depictions of the various cabinet coverings and grill cloths.
The text for this section was reproduced with the kind permission of the authors of Ampeg: The Story Behind the Sound, ©1999, published by Hal Leonard.
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