Greg is a long time Fender collector who is very knowledgeable not only in the details, but in the circuitry as well.
His particular area of expertise is in Fender amps made from about 1960 through 1967.
Vacuum tubes, or thermionic valves, are arrangements of electrodes in a vacuum within an insulating, temperature-resistant envelope.
The original Fender amps were tube-powered and the company also started producing solid-state models in the late 1960s.Additionally, Greg and Devin also had data that they had been collecting from Fender amps for years. Everything is confidential, we don't make record of who owns what amp in the database.We combined all of our information into a computerized database for this project and for the past 18 months have been slowly (sadly, very slowly) gathering information that we collect ourselves as well as from other people. What we need is the following: 1) Model name 2) Model number on the tube chart 3) Date code letters on the tube chart 4) Speaker codes (if speaker is original) 5) Transformer codes (if the amp doesn't have date codes on the tube chart) 6) Cosmetic features (flat/raised logo, tweed/tolex, blackface/silverface, rough/ smooth blond tolex, white/skirted knobs, TV-front/wide-panel, etc.) One very interesting and very important factoid has surfaced regarding the date code letters on the tube chart.They were made in three different sizes, 1×8" (one 8" speaker), 1×10", and 1×15".They are all very rare today and few have survived.The electrodes are attached to leads which pass through the envelope via an air tight seal.On most tubes, the leads are designed to plug into a tube socket for easy replacement.According to the Superior Music website that was mentioned here on another thread, it looks like it points to a 1970 amp.The serial number stamped in the chassis is A23373-107.Even at we struggle with keeping a correct amp and speaker model overview.There are also exceptions to the rules where Fender delivered non-standard speakers in special orders, Christmas campaigns etc. See our Buyer’s guide to vintage Fender amps for a guide and picture gallery of the known original speakers in the blackface and silverface amps.