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Single Ended Triodes (SETs), the ultimate tube lovers dream.

You are incorrect.

On a good state of the art, or close to it high fi sytem, there is an audible difference between a single triode, and two paralleled.

In your example, a common NOS bi plate 2A3 will never match the sonics of a single plate 2A3, such as the original HARP 2A3, and the modern EML versions.

Of course, the original Harp 2A3, and the EMLs have symmetrical filament structures, and large emitting filaments, as does the modern JJ 2A3-40, so that is a very large advantage, over a " W" or "V" shaped filament in the standard NOS bi plate.

But people do hear differences, on better audio implementations, parallel versus a single triode. The only instrument that can detect it, is our ears.

No need to discuss Chinese manufacture 2A3s, they are not good enough. Maybe this " single triode in a bottle " is why people with high efficiency speakers like a 45 over a biplate 2A3. Again, "the" measuring device of-choice is a good hi fi, and the parts on either side of our cranium.

Have fun,

Jeff


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