Dating stackpole potentiometers
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.
These codes can be found on speakers, transformers, pots, capacitors, and multi-section electrolytic "can" caps.
numbers beginning with 0) is that the second and third digits of the number denote the month in the first serial number system.
Therefore, a serial number where these two digits are greater than 12 must be from the second serial number system (1965 - 69).
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.
Search for dating stackpole potentiometers:
The M-12 Mercury circuit of 1960 used 6V6 power tubes, but the Mercury circuit of 1965 used 7591As.