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RE: New production 12AX7 for Paragon System E phono preamp

Thanks, Eli. The Paragon uses DC filament heating but has always been susceptible to hum, so the spiral filament of the Sovtek can only help. I use the phono section primarily to drive a professional sound card for digitizing LPs; low noise is of particular concern; the less there is, the less to clean up later in production.

The AES 12AX7 survey shows the Sovtek as one of the more noisy (3 out of 4) and having a bit of a bass rise; seems to be at bit at odds with your comments. Maybe just a fluke of the test methodology?

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