TODD'S BEATS

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The highest-power tube power amplifier in PrimaLuna's EVO range, with eight EL34 output tubes and a rating of 70 watts per channel in ultra-linear. It has triode and ultra-linear power ratings, RCA and XLR inputs and a slim remote.

The PrimaLuna EVO 400 is specified for EL34, KT88, KT120 or KT150 output tubes, so you can try different tube types.

A mono/stereo switch lets you use it as a mono amplifier, and a pair works as monoblocks.

Power (stereo)

70 W per channel ultra-linear, 38 W triode

Power (mono)

140 W ultra-linear, 82 W triode

Output tubes

8 x EL34 (KT88, KT120, KT150 compatible)

Inputs

RCA and XLR

Remote

Slim remote

Weight

31 kg

PrimaLuna introduces the EVO 400

Why you will love it

Four output tube types

PrimaLuna lists the EVO 400-4 for EL34, KT88, KT120 and KT150 output tubes. It comes with eight EL34 tubes and six 12AU7 tubes.

Ultra-linear power is listed as 70, 72, 85 and 89 watts per channel, depending on the tube type, and triode as 38, 43, 45 and 51 watts.

PrimaLuna EVO 400 tube power amplifier in black with the tube cage removed

Adaptive AutoBias

PrimaLuna's Adaptive AutoBias circuit sits outside the signal path. PrimaLuna says it monitors and adjusts tube bias continuously and instantly, which reduces maintenance and lowers distortion.

Built by hand

Each PrimaLuna is hand built in a heavy-gauge, fully vented steel chassis with a five-coat finish, each coat hand-rubbed and polished. PrimaLuna says the point-to-point wiring uses Swiss silver wire.

PrimaLuna uses Nichicon and DuRoch polypropylene capacitors, Philips rectifier diodes, ceramic tube sockets and gold-plated, solid-shaft WBT-style speaker terminals. The inputs are RCA and XLR, with gold-plated panel-mounted jacks.

Rear panel of the PrimaLuna EVO 400 tube power amplifier

Protection and transformers

PrimaLuna fits custom toroidal and EI-frame transformers, each fully encapsulated. Every PrimaLuna power transformer has PTP (Power Transformer Protection), which opens an internal thermal switch if the transformer overheats and restores power once it has cooled. SoftStart is there to reduce thermal shock to the tubes, and the EVO output stage has a protection relay for catastrophic tube failure.

Triode, ultra-linear and mono

PrimaLuna lists both ultra-linear and triode output power for the EVO 400 and supplies a slim remote. PrimaLuna says its remotes are for models with ultra-linear/triode switching.

All PrimaLuna EVO power amplifiers have a mono/stereo switch. In mono the speaker taps become 2, 4 and 8 ohm. In stereo they are 4, 8 and 16 ohm.

PrimaLuna EVO 400 tube power amplifier in silver, front angle

Is it right for you?

A great fit if you…

Want more power than the EVO 300 from a PrimaLuna tube power amplifier
Like to try EL34, KT88, KT120 or KT150 output tubes
Need XLR as well as RCA inputs
May add a second amplifier later and run a pair in mono

Worth knowing

It is a power amplifier, so you need a preamplifier for volume and source selection
It weighs 31 kg, so plan the rack or shelf

Build your system

Pair it with a preamplifier from the EVO range, a source and a pair of speakers.

Preamplifier: Add the PrimaLuna EVO 400 Tube Preamplifier
Digital source: Connect a PrimaLuna EVO 100 Tube Digital Analogue Converter through your preamplifier
Speakers: Choose floor-standing speakers or bookshelf speakers to suit the 4, 8 or 16 ohm taps
Go mono: Add a second PrimaLuna EVO 400 Tube Power Amplifier and switch both to mono

Specifications

Power and performance

Power, ultra-linear (stereo)	70 / 72 / 85 / 89 W per channel
Power, ultra-linear (mono)	140 / 145 / 175 / 188 W
Power, triode (stereo)	38 / 43 / 45 / 51 W per channel
Power, triode (mono)	82 / 88 / 94 / 109 W
Frequency response	9 Hz – 60 kHz ±1 dB, 8 Hz – 70 kHz ±3 dB
THD (AABB)	Under 0.1% at 1 W; under 2% at rated power
Signal to noise	95 dB – 105 dB A-weighted
Input impedance	100 kΩ
Input sensitivity	1100 mV for rated power
Maximum gain, ultra-linear	27 dB / 26.5 dB / 26.5 dB / 26 dB (stereo); 30 dB (mono)
Maximum gain, triode	25.5 dB / 24 dB / 24 dB / 24 dB (stereo); 28 dB / 27 dB / 27 dB / 27 dB (mono)
Damping coefficient	7 (1 kHz)
Power consumption	470 / 480 / 540 / 550 W

Connections and tubes

Inputs	1 pair stereo RCA and XLR, 1 mono RCA and XLR
Speaker taps	4, 8 and 16 ohm (stereo) / 2, 4 and 8 ohm (mono)
Model	EVO 400-4 for EL34 / KT88 / KT120 / KT150
Tube complement	8 x EL34, 6 x 12AU7
Remote	Slim

Size

Dimensions (L × W × H)	405 × 385 × 205 mm
Weight	31 kg

Figures are listed by PrimaLuna in tube order EL34 / KT88 / KT120 / KT150. Specifications from PrimaLuna's international product page and brochure, checked November 2026.

Questions people ask

Which output tubes does it use?

PrimaLuna lists the EVO 400-4 for EL34, KT88, KT120 and KT150 output tubes. It comes with eight EL34 and six 12AU7 tubes.

Can I run it in mono?

Yes. All PrimaLuna EVO power amplifiers have a mono/stereo switch. A pair can be used as monoblocks.

Does it have XLR inputs?

Yes. It has RCA and XLR inputs.

Does it have a remote?

Yes, a slim remote.

Which finishes are available?

Black and silver.