Differences between version 2 and predecessor to the previous major change of TheHammondLeslieAgeDeterminationList.

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Newer page: version 2 Last edited on May 24, 2002 9:39 am. by
Older page: version 1 Last edited on August 12, 2001 9:03 am. by
@@ -13,8 +13,13 @@
  
 Additionally, these lists of EIA manufacturer codes may be of use: 
 ;: http://www.triodeel.com/eiacode.htm#speakers 
 ;: http://www.webervst.com/morecode.html 
+  
+!Transformer Colors  
+  
+The color of the power transformer can help date an [AO-28].  
+They came in two colors: silver (pre-1963) and black (1963 and later.) Black transformers have a four digit date stamped into the bell housing.Silver ones do not. To get an idea of the production date for a silver AO-28 look at the can capacitor's date code (235-xxxx).  
 ---- 
 There's an older version of the age determination list at 
  
 ;:http://www.mitatechs.com/techline2.html 

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