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I read things like,"This tube has a very high transconductance for exceptional performance in preamplifier and driver circuits."
and
"Connected as a triode it has super low noise,
high transconductance..."And
"This Russian military triode is a relatively recent design with high transconductance and low mu for exceptional performance at audio frequencies."
But no where can I find an explanation of why high transconductance is better.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 05/09/17Follow Ups:
It has been clearly demonstrated that anything over 1.7034 mA/V has no dynamics, jump factor or transfer efficiency and is not suitable for audio.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
It's difficult enough with usual protagonists in action. I'm thankful for their absence and don't relish amateur satirists trying to stoke that fire.
91.
"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein
Douglas, you're one of the good guys, but this is asking for trouble. I've been truly enjoying the recent lack of acrimony. Even cleaned out my garage in preparation for cutting some new chassis... :)
--------------------------
Buy Chinese. Bury freedom.
Had no idea that 45 and 2A3 are garbage...
was only referring to signal tubes, having a mu over 68.1...:)
For some reason, low mu triodes are excluded from that requirement( also proven many times conclusively on this forum ).
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
that makes sense.
They can be low noise as gain stages and followers. I use two 6C45Pi in parallel single ended for my MC step-up.
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 ...
~!
The Mind has No Firewall~ U.S. Army War College.
High gm helps in the S/N dept. What makes the 6GK5 impressive is the combination of high gm with high μ, along with low plate resistance.
High gm can provide resistance to slew limiting induced by a loop NFB HF error correction signal.
Eli D.
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