From: user@domain.invalid   
      
   Am 09.02.2013 23:40, schrieb Barry:   
   >   wrote in message   
   > news:5c6dh8d320r7itrqe284e6lf87h2fcm0lv@4ax.com...   
   >> On a semi-related subject - do you know if the 5751 is equivalent to   
   >> the ECC82?   
   >   
   >   
   > It is essentially a 12AT7 which is vibration resistant.  It's filament   
   > current is slightly higher to achieve a more rugged filament.   
   >   
   >      73, Barry  WA4VZQ   
   >   
   >   
      
      
   ???   
      
   I always thought is more like a 12AX7 with a little less gain.   
   It has an internal resistance in the 60kohm range - opposed to 10k of a   
   12AT7. All datasheet values read more "12AX7ish" than 12At7.   
      
   They do a pretty fine job in the input stage of old Fender Tweed amps.   
   Especially the 5E3 Deluxe.   
      
   regards   
      
   Jochen   
      
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