Dating cts speakers

The date format was mostly Month/Day/Year, as shown below.

For example, A) a10-out-of-10 condition, unmodded 120 head will probably sell for less than a 5-out-of-10 condition Mark 3 100 with Chinese tubes; B) a clean Dallas Arbiter-era 4x12 cab will fetch less with Eminence speakers than it will with Fanes; C) a Mark 3 200 will probably get more than a Mark 4 200 Plus in identical condition.

A: Sound City amps have gone through several design eras, which are designated as follows: Arbiter-Sound City; Mark 1 (unofficial terminology); Mark 2; Mark 3; Mark 4; DMI; Mark 5 (which apparently never left the prototype stage and might have followed the SMF/Tour Series); Tour Series; and SMF Tour Series.

( The two-digit prefix in these serial numbers seems to indicate the year made, and in the latter example, which was seen on a DMI-Sound City F115 bass cabinet, it appears the model number might have been included in the serial number as well.

For the earlier Dallas Arbiter-era Sound City products, however, the best you can legitimately determine is a range of years during which an amp or cabinet was made based on the eras in which these products appeared.

The Company name was also stamped on the underside of some products and while not as accurate as a precise date, this at least establishes a period.

See Company History page for more information on Company name evolution.

The Electrical Industries Alliance (EIA) was an organisation which operated from 1924 to 2011 to establish a system of codes for electrical products.

In addition to the code number identifying the manufacturer, a code for the date of manufacture was included.

There really is no hard and fast method of appraising Sound City equipment; they've spent far too much time as poor stepchildren to Hiwatts for anyone to take them seriously as collectibles, but they are collectible in their own way.

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