Backert Labs Rhythm 1.4 preamp

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The Rhythm 1.4 uses an amplification circuit (“gain stage”) unlike any other. The way it amplifies is extremely easy on your tubes, running at a constant current and a remarkably low voltage (150 volts) for the blackest backgrounds possible, as well as the longest tube life you will find anywhere.

Its internal parts are of the highest quality, including the best capacitors ever built into a power supply (V-Cap™ capacitors), a first in audio made possible by Bob Backert’s patented GreenForce™ power supply.

Amazingly low output impedance (75 ohms) means that the Rhythm 1.4 combines beautifully with any power amplifier. The transformer is toroidal and custom-made. The IEC connector allows you to experiment with various power cords. And the premium jacks on the rear panel are so sturdy and widely spaced, the Rhythm 1.4 can handle whatever interconnects you may select.

How is the Rhythm 1.4 improved over the Rhythm 1.3?

The physical appearance is identical. The 1.4 has improved circuits in the power supply and gain stage, a solid-brass bottom panel for more holographic sound, and 2 fully balanced XLR outputs, as well as 2 fully balanced XLR inputs. It still has the 3 RCA inputs and 2 RCA outputs as well.

How is the Rhythm 1.3 improved over the Rhythm 1.1 and 1.2?
  • Fully balanced XLR inputs (2) and output (1): for those of you with long cable runs or who feel that balanced XLR just sounds better
  • Totally dual-mono power supply: left and right channels have their own power supplies and regulators for the ultimate in separation, imaging and accuracy
  • Improved output capacitors: Mundorf’s best and most costly, the “MCap Supreme EVO Silver Gold Oil”
  • Improved power supply capacitors: the famously dominant V-Cap PTFE capacitors now drive our GreenForce power supply — with copper foil, a frankly exotic capacitor that is totally unheard-of in an audio power supply
  • Improved circuit board: double the copper in each trace
  • Our latest circuit: gain stage and power supply regulator designs benefit from our latest research

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