Ultra Hybrid Stereo Phase Inverter Bridge

Price:$899 Circuits:Ultra Hybrid Inverter Chassis: SF Options:220/240V international transformer $30

Ultra Hybrid Stereo Phase Inverter Bridge

The Ultra Hybrid Bridge is our best phase inverter. This exquisite hybrid inverter is designed around a variation of our patented vacuum tube and power MOSFET Fet Valve circuits and is supplied in our new SF chassis. It is 17" wide x 12" deep x 3.5" high and weighs 13 pounds. It has our custom toroid power transformer, our multistage power supply (with four separate high voltage high current B+ regulators and two 12 volt heater regulators), all precision film resistors and audio capacitors, and fiberglass boards. There are no on or off switching transients. Unlike other phase inverters, ours has no crossover or transient distortion and exactly nulls with the noninverted outputs. The Ultra Bridge is a very quiet and unobtrusive enhancement to your audio system.

The Ultra Bridge is strongly recommended to get the best possible bridged performance from our Ultra 350 and Ultra 550 amplifiers, and when an AVA Ultra preamplifier is used. However, for systems not quite that demanding our OmegaStar solid state bridge will provide you outstanding musical results at a lower price.

What our Stereo Phase Inverter Bridges can do for you

AVA stereo phase inverter bridges can be used to generate a balanced output signal (e.g., for interfacing to balanced inputs commonly found on pro-audio equipment), to connect two stereo amplifiers in a bridged configuration (increasing power by a factor of three or more), or to drive a single stereo amplifier so that power-supply induced crosstalk is reduced.

Configuring two stereo amplifiers for bridged operation is easy. The inverter bridge is supplied with left and right inputs (which connect to your preamp's outputs), left and right non-inverted outputs, and left and right inverted outputs. The inverter bridge outputs are connected to two stereo power amplifiers, one power amp per channel. Each amp is fed a normal signal to one channel and the inverted signal to the other channel. The speakers are connected from the hot terminal on one channel to the hot terminal on the other channel. The normal ground terminals are not used! (Here's a diagram of the connection.) This sums the voltage swing of the two channels, at least triples the power, and eliminates common mode distortion. Separation, imaging, and dynamics are improved. There is no better way to get such extraordinarily high power.

Using an inverter bridge to make a single stereo amplifier sound better is even easier. Run one amplifier channel from an inverted output and the other from a non-inverted output. (Here's a diagram of the connection.) This puts the two amplifier channels out of phase so that the common drain on the power supply is reduced and residual cross-talk between the channels is attenuated. Reverse one loudspeaker connection to get the channels back in phase and enjoy more power, better separation and improved imaging.