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Old 1st January 2013, 02:53 AM   #61
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The EL34 is the only pentode that can be run as a true triode.
Not true! Check the 6CH6/EL821 out. It's another of those fine "12" W. multi-grid power types.

On the OT, LOTS of folks have had success with triode wired 6V6 family members. Say what you will about the curves; the sound is excellent.
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Old 1st January 2013, 08:10 PM   #62
dhieber is offline dhieber  United States
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How do you run a pentode as a true triode? By leaving g2 and g3 unconnected?
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Old 1st January 2013, 09:14 PM   #63
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Originally Posted by dhieber View Post
How do you run a pentode as a true triode? By leaving g2 and g3 unconnected?
No, you tie g2 and g3 to the plate. Resistors are the usual choice for the connections, to ensure that grid dissipation is not excessive.

A small difference can be observed between both g2 and g3 tied to the plate and only g2 tied to the plate, with g3 grounded.

The 6V6, 1 of the best sounding "strapped" triodes, is a beam power tetrode and has only 2 grids. Make what you will of that fact.
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