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RE: the 12AU7 as a design has poor distortion performance.

Posted by Eli Duttman (A) on July 7, 2015 at 18:58:45

In Reply to: the 12AU7 as a design has poor distortion performance. posted by Timbo in Oz on July 7, 2015 at 14:58:17:

"I would never use one for gain duty."

AGREED! The non-linear 12AU7 makes a poor voltage amplifier. The type is satisfactory as either a cathode follower or "concertina" phase splitter. Degeneration, AKA local current NFB, saves the day in those situations.

BTW, if a unit uses 12AU7 sections as voltage amplifiers and extra filament current is not available {говно :>((}, give plenty of thought to removing the Noval socket, mounting a Loctal socket, and installing the linear 7AF7. The 7AF7 data sheet happens to mention the 7N7, which is electrically equivalent to the 6SN7. ;>)


Eli D.

• 7AF7 Data Sheet   (Open in New Window)

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