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Study of a low IMD all 6SN7 amplifier



















Sometimes a new asylum post makes you wonder about a novel 'what if'.

A recent series of comments on IMD has triggered my interest in 'what if I replaced (mutatis mutandis) one EL84 with two 6SN7 tubes in the same circuit?'.

We are talking about a class A 4-5W amplifier.

In sim world I found out that this all 6SN7 circuit performs much better than any EL84 circuit I have ever simulated.

How much better?

The decision is up to you.

You can trade in much lower IMD in exchange for a higher gain.

Schematic, output signal graph, output currents and the spectra (between 9 and 10 seconds, between 10 and 11 seconds, between 11 and 12 seconds speak by themselves.


Omnes feriunt, ultima necat.


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Topic - Study of a low IMD all 6SN7 amplifier - cellailuca 02:46:12 11/25/21 (14)

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