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Oliver Sedlacek
08/31/12 01:03
Read: 574 times
Uk


 
#188204 - Tubes as in Mullard EL34s
Responding to: Neil Kurzman's previous message
Yes, it's got a pair of EL34 pentodes in parallel as the pass elements with 10 ohm resistors in the cathodes to share the current. The schematic shows the top grid connected to the cathode, the middle grid connected to a fixed bias about 270V above the cathode and the bottom grid connected to the error amplifier.

The filaments light up.


List of 20 messages in thread
TopicAuthorDate
Repairing old kit, any advice?      Oliver Sedlacek      08/29/12 13:31      
   "Suddenly" ?      Andy Neil      08/29/12 14:17      
   Perhaps Current Limiting        Justin Fontes      08/29/12 17:00      
      More info      Oliver Sedlacek      08/30/12 06:18      
         for those of us that ...      Erik Malund      08/30/12 07:01      
            Voltage-controlled      Per Westermark      08/30/12 09:07      
          pentodes? Tubes? (Valves?)      Neil Kurzman      08/30/12 17:21      
            Tubes as in Mullard EL34s      Oliver Sedlacek      08/31/12 01:03      
               One last bit of advice        Justin Fontes      09/04/12 11:30      
         Old electrolytics      Oliver Sedlacek      09/05/12 04:30      
            well, in lieu of a scope ....      Erik Malund      09/05/12 07:12      
            Last      Per Westermark      09/05/12 08:26      
            The problem isn't with the "old gear" ...       Richard Erlacher      09/05/12 09:57      
            Good hunch, then      Andy Neil      09/05/12 12:38      
               Update, not the electrolytic..      Oliver Sedlacek      09/07/12 02:01      
                  Google      Neil Kurzman      09/07/12 11:37      
                  ebay      Mahmood Elnasser      09/07/12 12:13      
                     Or just the Mullard      Neil Kurzman      09/07/12 13:54      
                  Anyone got an EL34?      Andy Neil      09/07/12 13:49      
                     Here you go...      Andy Neil      09/07/12 15:31      

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