Linear Audio USB stick

Now available as a fully searchable PDF collection – the Linear Audio USB stick!

See this page for details and ordering info.

Image
Linear Audio USB stick

Partition Noise and the ‘BestPentode’ Revisited

In Linear Audio Volume 0, Frank Blöhbaum proposed an interesting circuit for use with pentodes, which he called ‘BestPentode’. Blöhbaum claimed that this retains the basic properties of the pentode but eliminates its partition; his article also implies that the ‘BestPentode’ has lower EIN even than the simple, triode-connected pentode, and Merlin Blencowe does not agree with that.

In his article he demonstrates, by straightforward theory and experiment, that ordinary triode connection always results in the lowest-possible EIN from a given pentode, and that the ‘BestPentode’ when operating into the same load and with the same Ik and bias voltage, must always be noisier (though usually negligibly so). 

Image
Author(s)
In volume
Subject(s)
PDF preview
Image
v10 mb