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The Tron Seven Ultimate Mono Phonostage is a premium valve-based phono preamplifier designed for low output moving coil (MC) cartridges, with input sensitivity as low as 0.14mV for 1V output. It features transformer coupling, uses 12AX7 and 12AU7 triodes, and offers multiple gain settings (+24dB, +30dB, plus a fixed +49dB) to accommodate various cartridge outputs. The unit is built with meticulous attention to detail, including hand-matched components to 0.1% tolerance, a screened power supply compartment, and high-quality film capacitors and resistors. It has a presence/treble tilt in frequency response (+1.4dB at 10kHz, +2.0dB at 20kHz) to add liveliness to the sound without harshness. The output impedance is approximately 600 ohms. The chassis measures 455x105x355mm and the unit consumes about 10W of power. The Seven Ultimate Mono is noted for its rich, full-bodied sound with excellent dynamics, clarity, and a wide, deep soundstage. It is hand-built in the UK and is considered a top-tier phono stage competing with the best in its class. The unit reviewed was one of the last built, featuring silver wiring and an enhanced power stage, and is highly regarded for its musicality and sonic refinement.
Analog signal output specifications
Phono stage specifications
Size, weight, and appearance
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Estimated price (community-sourced)
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The closest alternatives on specs, description and the systems they turn up in, with the specs they share set side by side.
The VK-P80's signal-to-noise is 73 dB against the Seven Ultimate Mono Phonostage's 75.5 dB, its thd 0.100% against 0.120%, its mc gain 57 dB against 49 dB, and its mm gain 50 dB against 24 dB.
The Seven's thd is 0.060% against the Seven Ultimate Mono Phonostage's 0.120%. Both share signal-to-noise (75.5 dB), mm gain (24 dB), and mc gain (49 dB).
The FL Phono's signal-to-noise is 90 dB against the Seven Ultimate Mono Phonostage's 75.5 dB, its thd 0.050% against 0.120%, its mc gain 64 dB against 49 dB, and its mm gain 40 dB against 24 dB.
The PH7's signal-to-noise is 76 dB against the Seven Ultimate Mono Phonostage's 75.5 dB, its mc gain 57.5 dB against 49 dB, its thd 0.005% against 0.120%, and its mm gain 57.5 dB against 24 dB.
Seven Ultimate
Krell K-300p
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