Vac phi300jz_550_550



The groundbreaking Phi 300 pioneered the unique direct-coupled Class A triode input and driver circuitry that allowed VAC to get closer to the sound of the recording studio or concert hall than ever before. This consummately musical performer is also extraordinarily flexibly, with settings for fully balanced or single-ended input, selectable front panel attenuators, 150-watt/channel stereo or 300-watt mono modes, and triode or ultralinear output operation. The visual celebration of tubes behind the thick front glass is a fitting match for the joyous sound.


Wattage 150 – stereo300 – mono
Gain 36 dB, SE/stereo30 dB, balanced/stereo

37 dB, SE/mono

31 dB, balanced/mono

Frequency Response 4 Hz to 75 kHz
Power Bandwidth 13 Hz to 70 kHz
Inputs Single-ended input via RCA jack, non-invertingBalanced input via XLR jack, non-inverting relative to pin 2 (“pin 2 hot”, traditional EIA/RCA broadcast/recording standard).
Outputs Connections to precisely match loudspeaker loads of 2, 4, and 8 ohms
Tubes 8x KT884x 6SN7
Residual Noise Typically, 700 microvolts at the speaker terminals
Voltage May be factory configured for operation at 100, 120, 220, or 230/240 volts
Power Cord Detachable power cord, standard IEC power receptacle
12-volt Trigger Yes
Illumination Illuminated logo may be switched off
Finish High-gloss finish, hand-polished, black or silver
Warranty Two years parts and labor, excluding tubes (USA, see manual for full details)
Dimensions (H x W x D) (Not including knobs or connectors) 9.75 x 17.8 x 18.25 in. (24.8 x 45.2 x 46.4 cm.)
Shipping Weight 128 lbs. (58.2 kg.)

*Specifications subject to change without notice.


The VAC Phi 300.1a is an extremely potent amplifier guaranteed to transcend your previous ideas of reference amplifiers; majestic, commanding, totally harmonious with astounding definition and holographic imaging. It is based on a direct coupled input & driver circuit that results in the fastest, fullest, most detailed sound that have ever achieved and you are likely to ever hear. The ambience and retrievel of reverb and decay information is particularly surprising Read More