Dating a fender vibrolux
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Replacement tubes and transformers are readily available for these amps however there are many boutique amp manufacturers making new tube amps with a vintage sound.
Fender does not date their amps like they do their guitars by serial numbers. The two letter date code stamped on the Tube Chart or on the QA Sticker, or 2.
The transformer number starting with "606-" followed by 3 or 4 additional digits and remember to put all dash marks in as the dash marks separate the week and year of manufacture from each other.
When hot, the filament releases electrons into the vacuum: a process called thermionic emission.
The resulting negatively-charged cloud of electrons is called a space charge.
An alternating current in one winding creates a time-varying magnetic flux in the core, which induces a voltage in the other windings.