The Neo-Classic 300B offers true topology switching between Single-Ended (12W) and Push-Pull (24W) configurations. Single-Ended mode operates with zero negative feedback in pure Class A, emphasizing harmonic richness, spatial dimensionality, and low-level detail resolution. Push-Pull mode provides doubled output power with reduced distortion and increased damping factor, delivering enhanced bass control and extended dynamic capability for demanding loudspeaker loads and complex musical passages.
Neo-Classic SE/PP 300B
Neo-Classic SE/PP 300B
Switchable topology 300B amplification
- True Single-Ended and Push-Pull operation via front-panel switching
- Pure Class A topology utilizing legendary 300B triode output tubes
- Variable negative feedback control for damping factor adjustment
- Custom-wound Manley IRON® output transformers designed in-house
Experience the Manley Neo-Classic 300B, dual-topology triode amplification
The Manley Stereo Neo-Classic 300B delivers switchable Single-Ended and Push-Pull operation in a single amplifier, providing access to two distinct triode topologies optimized for different performance priorities. Hand-built in California around four 300B output tubes and custom-wound Manley transformers, this amplifier combines the dimensional imaging and harmonic purity of Single-Ended Class A operation with the power reserves and control of Push-Pull configuration for comprehensive system matching capability.
Continuously variable feedback for precise system optimization
A front-panel negative feedback control allows continuous adjustment from 0 dB to 10 dB, modifying the amplifier's damping factor and transient characteristics. This variable topology enables precise matching to loudspeaker impedance curves and personal sonic preferences, ranging from zero-feedback purity with maximum harmonic transparency to moderate feedback for tighter bass control and extended bandwidth. This flexibility ensures optimal performance across diverse speaker designs and listening requirements.
Four 300B triodes with custom transformer engineering
The Neo-Classic 300B employs four 300B triode output tubes operating in pure Class A for maximum linearity and harmonic accuracy. Custom-wound Manley IRON® output transformers are engineered in-house with specialized winding techniques to accommodate both Single-Ended and Push-Pull operation while maintaining wide bandwidth, low distortion, and exceptional low-frequency extension. This combination delivers the sonic characteristics that define reference-grade 300B amplification: transparency, dimensional accuracy, and natural tonal balance.
Power Output
12 Watts (SE) / 24 Watts (PP)
Tubes
4 x 300B, 2 x 6SN7GT, 2 x 6SL7GT
Frequency Response
10 Hz – 40 kHz
Negative Feedback
Adjustable (0 to 10 dB)
Input Sensitivity
750 mV for full output
S/N Ratio
-78 dB typical
Frequently Asked Questions
Classic 300B offers two distinct user-selectable amplifier topologies. Single-Ended (SE) operation uses a pure Class A circuit where the output tube is always conducting, resulting in a rich, lush tone with predominantly musical, even-order harmonics. This mode delivers 12 watts of power and is prized for its extreme transparency and intimacy. Push-Pull (PP) operation uses two tubes (or sets of tubes) in opposition, providing higher power (24 watts) and lower measured distortion. This mode offers a faster, tighter sound with better control over demanding speakers and a wider dynamic range.
Given that the Manley Neo-Classic 300B outputs 24 watts in Push-Pull mode and 12 watts in Single-Ended mode, it is best suited for use with high-efficiency loudspeakers, typically those with a sensitivity rating of 90 dB or higher. These speakers will translate the amplifier's power into sufficient listening volume while allowing the nuances and dynamics of the low-wattage triode tubes to shine through.
No, you do not need to manually bias the 300B output tubes. The Manley Neo-Classic 300B employs an automatic bias system, which keeps the tubes operating at their optimal current level without any user intervention. This self-biasing feature provides continuous reliability and ease of use, ensuring the legendary 300B triodes are always running at their sonic peak.
The adjustable Negative Feedback control (ranging from 0 dB to 10 dB) significantly affects the amplifier's damping factor, which in turn influences the bass response.
The Manley Neo-Classic SE/PP 300B is specifically engineered and optimized for the unique operating characteristics and socket pinout of the 300B output tube. Using other types of tubes would require extensive, non-trivial modifications to the amplifier's internal circuitry and power supply voltages, and is strongly advised against. The performance is guaranteed only with quality 300B tubes.
The Neo-Classic 300B is primarily a loudspeaker amplifier. It does not feature a dedicated headphone jack or a dedicated headphone output stage. While it is technically possible to drive certain high-impedance headphones directly from the speaker taps via an adapter, this is not a recommended or supported feature. For dedicated, high-performance headphone listening, a specialized unit like the Manley Absolute Headphone Amplifier is the ideal solution.
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