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Tube feedback question

9/26/2000 11:39 PM
Al
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Tube feedback question
Hi,  
 
In an article about a Orange amp (4xEL84 Class A) I came across the fenomen "OTR (Oscillatory Transition Return)."  
 
This new system should "Improve the natural feedback in the tube."  
 
...natural feedback in a tube...?  
 
Can somebody explain??  
 
Thanks in advance,  
Al