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Old 3rd September 2006, 08:20 PM   #11
Ryssen is offline Ryssen  Sweden
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Maybee a dumb question but isnt it better to have the pentode on top,and the triod under?
Regards ke
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Old 3rd September 2006, 09:17 PM   #12
jane is offline jane  Norway
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Originally posted by Ryssen
Maybee a dumb question but isnt it better to have the pentode on top,and the triod under?
In this case its part of the design to have a high resistant point to feed back the shunt feedback. A mu-follower feeding a pentode will do the trick. The AC impedance will be pretty high (good for shunt feedback) and the DC-resistance quite low. Im able to feed 4-5mA through an apparently high resistance.

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