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The Wyetech Labs Sapphire 300B is a rugged, all-welded steel chassis monoblock amplifier designed around the popular 300B vacuum tube. It uses upgraded Shuguang 'A' Treasure 300B-Z output tubes for superior sound and reliability, complemented by rugged 5687 NOS triodes for the voltage and driver gain stages. The amplifier features a custom wide bandwidth Hammond output transformer that delivers quick, deep bass and smooth highs extending to 40 kHz. Separate high voltage DC power supplies isolate the voltage/driver stages from the output stage, enhancing signal purity. The design includes self-biasing stages with independent automatic biasing circuits for each output triode, ensuring long-term stability and sound purity comparable to single triode operation. It operates in pure Class A1 mode with no feedback, providing 18 watts RMS per channel and dynamic headroom up to 40 watts. The amplifier has selectable input impedance and gain settings, universal voltage compatibility (115/230V, 50/60Hz), and weighs 33 lbs per monoblock. Dimensions are 9.5" W x 16" L x 8.5" H. The Sapphire 300B is noted for its low noise, wide bandwidth, and exceptional sound clarity and dynamics.
Amplification power output and characteristics
Analog signal output specifications
Size, weight, and appearance
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions
The closest alternatives on specs, description and the systems they turn up in, with the specs they share set side by side.
The Super 300B SET's power @ 8ω is 9W against the Sapphire 300B's 18W, its output voltage 1.5V RMS against 1.3V RMS, its input impedance 100Ω against 55Ω, and its input sensitivity 1.5V RMS against 1.3V RMS.
The P21 EXD's power @ 8ω is 20W against the Sapphire 300B's 18W, its input impedance 100Ω against 55Ω, its input sensitivity 1.2V RMS against 1.3V RMS, and its weight 15.88 kg (35 lbs) against 15 kg (33 lbs).
The ZOTL40 Reference+'s power @ 8ω is 46W against the Sapphire 300B's 18W, its input sensitivity 1.2V RMS against 1.3V RMS, its input impedance 50000Ω against 55Ω, and its weight 6.8 kg (15 lbs) against 15 kg (33 lbs).
The 9084D MKII's power @ 8ω is 28W against the Sapphire 300B's 18W, its output voltage 1.0V RMS against 1.3V RMS, its input sensitivity 1.0V RMS against 1.3V RMS, and its input impedance 100000Ω against 55Ω.
Leben CS300-XS
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