Unfortunately, not all sellers subscribe to this code of ethics.
Even careful buyers can be fooled by seemingly minor part replacements that were performed to improve an amp’s appearance or repair its circuitry.
The JCM800 series (Model 2210 and others) is a line of guitar amplifiers made by Marshall Amplification. Although models 22 had been in production since 1975, they were reintroduced as JCM800 amplifiers in '81.
The JCM800 amplifiers became a staple of 1980s hard rock and heavy metal bands.
Compared to the earlier "Master Volume" series, they offered some advantages, including the possibility to be patched internally and linked with other amplifiers.