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It is important to note that parts do not always contain EIA codes, especially those parts from the late 1940s and early 1950s.
Some common manufacturer codes for parts used in Ampegs include: The Michael-Hull amplifiers can be narrowed down to a date of manufacture between 19.
Of course, these codes are only applicable to original components, not replacement parts.
WARNING: Ampeg amplifiers, especially the high-powered amps such as the SVT and V-series, contain lethal voltages even when unplugged and turned off.
A Super Echo Twin with serial number 404553 was made in 1964 (4), during April (04) and may have been the 553th amp made that month (553).
Caution is needed for dating amps from 1953, 1954, 1955, and 1960.
It has a note at the top of the page that they were reprinting with permission from the authors of Ampeg: The Story Behind the Sound, ©1999, published by Hal Leonard.
If anyone feels this page should be taken down, please feel free to contact me.
For example, a Duette with serial number 710201 was made in 1957 (7), during October (10), and was possibly the 201st amp made that month.An Ampeg from 1960 would be covered in navy random flair vinyl whereas an amp from 1965 would be covered in blue check vinyl.Another check for a 1960 versus a 1965 or later serial number (i.e.The M-12 Mercury circuit of 1960 used 6V6 power tubes, but the Mercury circuit of 1965 used 7591As.Likewise, an Ampeg from 1954 would not be covered in blue check vinyl whereas an amp from 1964 would have this covering.