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In Reply to: What, if anything, do high transconductance triodes bring to the table? posted by Tre' on May 9, 2017 at 20:53:26:
Those are the advantages from an engineering perspective.
There are subtleties of course. To get high transconductance, the grid must be very close to the cathode. This means distortion and greater variability unless precision geometrical construction is used - which makes it expensive. High cost gives subjectively better sound of course ... :^)
Also, to prevent cathode material from depositing on the grid and causing grid current, it is often necessary to plate the grid wires with gold - also expensive.
High transconductance also reduces high-frequency noise. This is an advantage in VHF radio service, but may not translate into low noise at audio frequencies, where 1/f noise is often predominant. That's a whole 'nuther topic ...
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Follow Ups
- High gain and high current at the same time ... - Paul Joppa 21:12:07 05/09/17 (1)
- What Paul said... all I can add is Superior resolution, from the Audiophool perspective~nT - Cleantimestream 00:54:32 05/10/17 (0)
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