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12AX7A question, please

5/7/2000 2:26 AM
12AX7A question, please
Are there any substantial differences between these valve nomenclatures?:  
12AX7A vs ECC83 vs 12AX7  
In some places I've seen 12AX7A <=> ECC83  
But on the valves I usually see 12AX7/ECC83  
What is it all about?  
Thanks in advance.  

Peter S At one time these designations had ... -- 5/7/2000 6:52 AM