It looks like you are visiting our site on a browser that is really old.Unfortunately, this means you can't get the full experience. This page is a collection of odds and ends information relating to speakers and speaker implementation.
These numbers always begin with "606" , and are followed by three or four digits in various combinations.
This tells us that this is an Oxford speaker (465 is the number for Oxford, 137 is CTS, 220 is Jensen and 328 is Utah).
The forth digit is 9, which tells us it was made in 1959 and 09 tells us that it was the ninth week of the year.
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.
In the fall of 1965, Fender switched from stamping these numbers in black ink, to dark green ink.