Full Power Balanced Power Amplifier KRELL FPB-600

The Krell FPB-600 Amplifier Specifications

Krell FPB600 amplifier, $12,500.
Krell Industries, Inc., 45 Connair Road, Orange, CT 06477 USA.
Direct coupled, current mode, bipolar transistor stereo amplifier.
Fully balanced circuitry from input to output.
Power transformer capacity, 8 kVA.
Nominal output rating: 600 watts/ch into 8 ohms, 1200 watts/ch into 4 ohms, 2400 watts/ch into 2 ohms.
Fully regulated input and output supplies and 'sustained plateau biasing', permitting full class A operation and low or high output levels but allowing the amplifier to run cool at idle or low input.
Weight: 180 lbs.
Warranty, 5 years, transferable.

Krell FP-600 stereo amplifier

The FPB 600 was, as far as I know, Krell’s first fully regulated stereo amplifier. Instead of simply being regulated by the power-supply filter capacitors, each of its 30 output devices per channel was actively regulated by another active output device. That makes for a total of 120 output devices in a stereo chassis. Wow. The power supply was no less impressive: two 4kVA transformers, for a total of 8000W on tap. All of this hardware translated into a 180-pound beast that, though rated at a “mere” 600Wpc, could actually output closer to 1000Wpc into 8 ohms. If the word unflappable could ever be applied to a power amplifier, it describes this one. The FPB 600 was introduced around 1997, just over ten years after the Thresholds, and retailed for $12,500.

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