The VAC Phi™ 300.1 is an extremely potent amplifier with power, superb definition, and great control. Its eight beam power output tubes yield 300 watts in bridged mono mode or 150 watts/channel in stereo mode at the choice of the user. Front panel level controls may be engaged to aid in balancing biamplified systems. Both balanced XLR and single-ended RCA inputs are provided. Triode operation may be selected at the flick of a switch. The chassis is machined aluminum, with the tubes beautifully showcased behind 0.75" acrylic glass. Also included are standard 12 volt triggers.

The Phi 300.1 is VAC`s finest amplifier. It is based on our direct coupled input & driver circuit that results in the fastest, fullest, most detailed sound that we have ever achieved. You will be surprised by details in your recordings that you had never heard before. The ambience and retrievel of reverb and decay information is particularly surprising.

Using eight beam power output tubes and a low-mu octal driver, this amplifier possesses an uncanny ability to reveal every nuance in a recording, while preserve the emotion and feel necessary for a truly musical performance. In addition to finesse, it has great power, impact, control, and a low electrical noise floor. This remarkable overall character makes it suitable for use with speakers ranging from high efficiency to the most difficult and demanding.

Both single-ended and balanced (fully balanced amplifier mode) inputs are provided. The chassis is custom machined 0.25" aluminum welded into a solid unitary structure, finished in metallic black paint. The 1" thick aluminum front panel is finished in hand rubbed silver metalic lacquer, with bias meter and tube adjustors that make it easy to maintain and optimize. Output matching taps are provided for 2, 4, and 8 ohm speakers.

Basic specifications:
150 watt/channel stereo amplifier
300 watt mono amplifier (bridge mode via switch setting)
Gain (level controls at maximum): 36 dB, SE/stereo; 30 dB, balanced/stereo; 37 dB SE/mono; 31 dB balanced/mono
bypassable channel level controls (useful for fine tuning biamplification systems or acoustic channel balance)
frequency response 4 Hz to 75 kHz
power bandwidth 13 Hz to 70 kHz
single-ended input via RCA jack, non-inverting
balanced input via XLR jack, non-inverting relative to pin 2 ("pin 2 hot", EIA old RCA broadcast/recording standard); amp is fully balanced in this mode
triode switch
residual noise typically 0.0007 volts at the speaker terminals
12 volt triggers
illuminated logo; may be switched off
dimensions: 17.8" wide, 18.25" front to back (not including knobs or connectors), 9.75" high
shipping weight 128 lbs.
8 x KT88, 4 x 6SN7
detachable power cord, standard IEC power receptacle
may be factory configured for operation at 100, 120, 220, or 230/240 volt operation
Two years parts and labor warranty, excluding tubes (USA, see manual for full details).
Specifications subject to change and improvement without notice