Dating a silverface amp
That Music Master Bass amp or Silverface Champ that you could have bought all day for 50 bucks as recently as 2 years ago can run as high as 350-400 on ebay now.
Though, hopefully no one will bid on those that are that high. But, they are still available at killer prices, if for no other reason, there are many of them still available..a silverfaced amp was passed over in the 80's and 90's by someone that HAD to have a tweed or blackfaced one.
This directory contains USENET articles Mic has saved about guitars, equipment, pickup, techniques, players, and so on.
Mic has graciously granted permission to post the stuff on the JT30 page on the off chance that it might be useful in the context of Blues Harmonica.
These date codes will contain two letters of the alphabet which refer to the year and month of production, and may be interpreted as follows: In the absence of the rubber-stamped date codes, EIA numbers taken from the transformers may allow you to determine the date of production of your amp.
These numbers always begin with "606" , and are followed by three or four digits in various combinations.
The amps are known for their characteristically clean tone.
The Twin has seen a number of revisions since its introduction, both internal and external, with its designs sometimes varying greatly from one year to the next.
I also have a small amount of knowledge of and experience in working on tube amps.
Here is an example: EIA 606-4-21 would mean the 21st week of 1964.
It is also advisable to add about 6 months to the date to allow for time these parts may have spent in storage.
View the underside of the chassis (flashlight helps alot)look for the reverb driver trans.
Its in the middle of the 6 preamp tubes with the removable shields. For a black face, this transformer would have been made in 1964 during the 23 week (—423) The trick to this is they don’t renumber the decades.