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The 6DN7 is a dual-triode vacuum tube with dissimilar sections: a high-current section rated around 60 mA at Gm 15,900 and a low-current section around 8.3 mA at Gm 2,300. Sylvania's 1960s production is the version most sought after by tube amp builders and restorers. It is not a general-purpose audio tube; it suits specific circuits that call for the 6DN7, such as the Bottlehead S.E.X. headphone amp and Smack, some Conn organ amplifiers, and the MFA Luminescence preamp. Compared with current-production small-signal tubes, NOS Sylvania stock is prized for consistency and low noise, but supply is finite and used or untested tubes are a gamble.
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Lowest price we've seen: $9.65 on Nov 13 at Amplified Parts. Tracked across 1 store since Nov 13.
Owners and builders of Bottlehead and organ amps describe Sylvania 6DN7s as quiet, stable and long-lived when the tubes are genuinely new. Complaints center on inconsistent testing and noisy examples from untested stock.
This is a Sylvania 6DN7 vacuum tube, new old stock (NOS) from the 1960s. It is rated at 60 mA with a transconductance (Gm) of 15,900, and at 8.3 mA with a Gm of 2300.
It has been used in the Bottlehead S.E.X. headphone amp, the Bottlehead SMACK, a 1970s CONN two-channel organ console amp and the MFA Luminence preamp from 1990.
