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This is a single new-old-stock 12AU7 dual triode made at Philips' Herndon Works in Australia in the 1970s, sold in its white box. Both sections test strong on an Amplitrex: about 9.6 mA and 8.8 mA, with Gm around 2100 and 1900. Owners of this tube describe a sound close to Philips Holland 12AU7s, with strong detail, present upper mids and solid bass. It suits tube preamps, hi-fi linestages and guitar or harp amps that take a 12AU7, and it is a genuine NOS alternative to current-production 12AU7s.
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This is a Philips 12AU7 vacuum tube, new old stock from around 1970. It was made at the Herndon Works factory in Australia and comes in a white box. It is a low-noise tube.
Each section was tested on an Amplitrex. One section reads 9.6 mA with a Gm of 2100. The other reads 8.8 mA with a Gm of 1900. The sound is similar to Philips Holland tubes, with very good detail, upper-midrange presence and good bass.