Dating fender solid state amps
Fender's Frontman amps deliver quality solid-state tone at a low price tag.These solid-state amps are great for beginners, but are also popular with guitarists who are looking for volume on a budget - the Frontman 212R packs 100 Watts of power and onboard reverb into two-channels.
Eventually, I thought, I'll get a rough idea what the highest and lowest s/ns were.
I would have to collect data for ALL the amp types, just to work out how many were made of mine.
Then I became aware of the amazing work Greg Gagliano had been doing since the 1990s - the summary of his latest results are here - and that his research stopped just before the Rivera-era. However for this range of amps at least, I reckon it's not just a policy of withholding company-confidential information. It's no criticism of Fender to suggest that they were too busy making great amps to keep records just so some amateur can use them thirty years later.
The simplest vacuum tubes resemble incandescent light bulbs in that they have a filament sealed in a glass envelope which has been evacuated of all air.
When hot, the filament releases electrons into the vacuum: a process called thermionic emission.