Dating Aids for Any Amp

Common Potentiometer Codes
Code Manufacturer
106 Allen-Bradley
134 CentraLab
137 CTS
140 Clarostat
304 Stackpole
381 Bourns Networks

Common Speaker Codes
Code Manufacturer
67 Eminence
73 JB Lansing (JBL)
137 CTS
220 Jensen
308 Stromberg-Carlson
328 Utah
336 Western Electric
391 Altec-Lansing
416 Heath
465 Oxford
589 Bogen
649 Electro-Voice

Common Transformer Codes
Code Manufacturer
606 Schumacher
830 Triad

How the Manufacturer and Date Codes Work.


Less Common Source Codes
Code Manufacturer
24 Becker
101 Admiral
119 Automatic Mfg
125 Bendix
130 Panasonic
132 Talk-a-Phone
145 Consolidated
150 Crecent
169 Hitachi
185 Motorola
188 General Electric
213 Dearborn Wire
230 Littlefuse
232 Magnavox
235 Mallory (North American Capacitor)
245 National
251 Ohmite
252 Dukane
260 Philco
270 Quam-Nichols
274 RCA
277 Emerson
280 Raytheon
285 Rola
286 Ross
296 Solar
312 Sylvania
343 Zenith
371 Best
381 Bourns
394 Foster Transformer
433 Cleveland
449 Wilder
446 Delco
549 Midwest
575 Heppner
706 Pioneer
719 Carbonneau
742 Esquire
748 Russel
756 Universal
767 Quincy
787 Sonatone
789 McGregor
794 Harmon Kardon
795 Atlas
828 Midland
840 Ampex
847 University
918 Oaktron
1056 Fisher
1059 Channel
1098 Pyle
1113 Acoustic Fiber Sound
1149 Curtis Mathis
1191 Micro Magnet