For example, the logo on the amp or materials used during a certain time period of production.
Dating an amplifier by serial numbers can be effective as well.
Hey Zach, I’ve got an Ampeg B-15, serial number 0137XX, and I suspect it is from the mid 1960s.
Can you tell me a little about my B-15 and what it is worth today?
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.Ampeg has been a huge part of amplifier history, with amplifiers dating back to the mid 1940s that have been used by bands such as The Rolling Stones, Pink Floyd, Television, Booker T and the MG's, The Clash and others. Being able to place specific products in their time period is a great way to assess value and impress fellow gearheads.Ampeg did utilize serial numbers when producing their amps, but these numbers can sometimes be inaccurate. For most purposes, the vacuum tube has been replaced by the much smaller and less expensive transistor, either as a discrete device or in an integrated circuit. and Canadian English) or (thermionic) valve (outside North America) is a device generally used to amplify, or otherwise modify, a signal by controlling the movement of electrons in an evacuated space.