Note - Additional serial number decoding information can be found on KD4DCY's Jupiter Resource Page at http://kd4dcy.net/jupiter/serials/serials.shtml.
From the Ten-Tec Reflector January 29, 2004
From an old email from Scott, W4PA:
TEN TEC SERIAL NUMBER DECODING
Example: Serial Number 06A10108
06 at the front is month of manufacture, or scheduled production run month. If we were scheduled to build a run of a particular model in June, and for some reason we were delayed to July or August for that particular run, we'd still put "06" at the front of the serial number. "A" is a separator between the groups of digits. "1" is the production run # for that particular month. "010" is the unit number. "8" is the year of manufacture. (A "C" separator began being used in 2000.1) )
Omni VI Plus s/n 06A10108
06 = June
A = separator
1 = production run # for that particular month
010 = unit #
8 = year of manufacture
Unit #10 of production run #1 from June, 1998.
Model 238 Tuner s/n 41A10349
41 = April
A = separator
1 = production run # for that particular month
034 = unit #
9 = year of manufacture
Unit #34 of production run #1 from April, 1989.
Model 420 Amplifier s/n 5B10053
5 = May
B = separator
1 = production run # for that particular month
005 = unit #
3 = year of manufacture
Unit #5 of production run #1 from May, 1993
Model 9420 Power Supply s/n 12A10082
12 = December
A = separator
1 = production run # for that particular month
008 = unit #
2 = year of manufacture
Unit #8 of production run #1 from December, 1992
Model 961 Power Supply s/n 41A10019
41 = April
A = separator
1 = production run # for that particular month
01 = unit #
9 = year of manufacture
Unit #1 of production run #1 from April, 1989