Doshi Audio

Evolution Line Preamplifier

Introduced 2022$29,950 MSRP

Founded by engineer Nick Doshi, Doshi Audio is a small American manufacturer building point-to-point-wired, no-feedback tube electronics in stainless-steel chassis with a limited dealer network; the Evolution Line is its flagship transformer-volume-control preamplifier. Hi-Fi+ calls the nineteen-year-old company's reputation for "peculiar" preamp magic well-earned, noting the Evolution's Sowter/Carnhill transformer volume control and over-specified outboard power supply.

MSRP

$29,950

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Specifications

Gain: Maximum 12 dB, internally adjustable lower
Price: $29,950 USD (also listed as £26,000 / €29,950)
Inputs: 4 stereo inputs, configurable in any combination of RCA and XLR
Weight: 17.7 kg / 39 lbs (preamplifier plus external power supply)
Outputs: 2 stereo outputs, configurable as RCA or XLR; home-theater bypass via XLR balanced or RCA
Dimensions: 44 × 14 × 46 cm (W×H×D), preamplifier chassis only
Construction: 14-gauge stainless-steel chassis, point-to-point wiring, isolated sub-chassis with constrained-layer-damped top plate
Volume control: Transformer-coupled Sowter/Carnhill unit with 31 steps from mute to max, buffered and galvanically isolated between input and output
Tube complement: 2x ECC99/12BH7 (one per channel); NOS 12BH7 types can be substituted for tonal variation
Power consumption: 22 W
Signal to noise ratio: At least 100 dB below 1V, unweighted