Tung-Sol 12AX7 New Production Preamp Vacuum Tube
The Tung-Sol 12AX7 has a big, warm and musical sound that can help to improve the tone of any musical instrument amp as well as any Hi-Fi amp. With high-gain, low microphonics and superb linearity, this 12AX7 is sure to make your rig sound its best.
I use the Tung-Sol 12AX7 New Production Preamp Vacuum Tube in the V1, first pre-amp gain stage in two of my hand built tube amplifier designs - a 30W with 3 12AX7s and a 20W dual channel with one 12AX7. For the 30W design I tested Tung-Sol, a Mullard, and a JJ in all three tube positions. The Tung-Sol gave me the best results in V1.
This tube has very low noise due to a spiral filament and short plate. The gain is low-to-moderate, the tonality is clear, uncolored, and stable. It is dynamic and has good headroom.
This makes it an ideal choice for the first gain stage, where I use the amp's design for tone / gain shaping.
reviewed by: Bruce Blumentritt