I was wondering...
Tube microphone circuits always seem to use pentodes wired as triodes?
(Examples: Neumann ELA M 027, U47, Sony C37, C800, Gyraf G7, Royer mod circuits, Lomo, Oktava MKL2500 etc etc.)
Am I wrong? Are there any exceptions?
And are their reasons why we never see them wired as pentodes?
Always we see grids 2 & 3 tied to the anode or cathode. Should it be possible to lower the noise by supplying stabilised voltage to grid 2?
Yet generations of talented designers seem to have gone for the 'as triode' approach. Is there anything inherently unsuitable about other approaches?
:?:
Tube microphone circuits always seem to use pentodes wired as triodes?
(Examples: Neumann ELA M 027, U47, Sony C37, C800, Gyraf G7, Royer mod circuits, Lomo, Oktava MKL2500 etc etc.)
Am I wrong? Are there any exceptions?
And are their reasons why we never see them wired as pentodes?
Always we see grids 2 & 3 tied to the anode or cathode. Should it be possible to lower the noise by supplying stabilised voltage to grid 2?
Yet generations of talented designers seem to have gone for the 'as triode' approach. Is there anything inherently unsuitable about other approaches?
:?: