Manley Labs
Neo-Classic SE/PP 300B Monoblock Amp (Pair)
$12,999.00 USDPay Over Time
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Features
Versatile Output Stage: The amplifier utilizes a single-ended output stage, known for its uni-directional current and voltage flow, complemented by precision-switched negative feedback ranging from zero to 10 dB. This provides users with flexibility in tailoring the amplifier's performance to their preferences.
Exceptional Cleanliness and Linearity: Even with zero negative feedback, the SE/PP 300B Monoblock Amp delivers unparalleled cleanliness and linearity, surpassing other single-ended amplifiers in performance.
Variable Damping Factor: The amplifier offers variability in damping factor, allowing users to adjust damping to suit different speaker characteristics, room acoustics, and personal preferences.
Precision Control: Users can fine-tune feedback settings in precise 1 dB steps, ensuring optimal performance in diverse listening environments.
High-Quality Construction: Built with the utmost attention to detail, the amplifier features high-quality components, including gold-plated connectors, premium capacitors, and rugged chassis construction for durability and reliability.
Flexible Integration: Designed to seamlessly integrate into a variety of audio systems, the SE/PP 300B Monoblock Amp offers compatibility with a wide range of speakers and sources, making it a versatile choice for audiophiles.
Acclaimed Performance: The amplifier has garnered acclaim from critics in prominent audio publications, testament to its exceptional sonic performance and engineering excellence.
What's in the Box?
Warranty
The Manley Laboratories Neo-Classic SE/PP 300B monoblock amplifier exudes a distinct retro charm, reminiscent of a simpler era in design. Its allure lies in the promise of lush mid-range tones, intricate details, and captivating emotion. What sets it apart is its user-friendly hifi features, allowing control over negative feedback and the unique ability to switch between 12 Watts in parallel single-ended mode and 25 Watts in push-pull mode. This adaptability ensures a delightful experience, catering to a variety of efficient speakers and discerning ears.
The 300B amplifier owes its charm to the elegantly simple design of the 300B directly heated triode, an early innovation with just three elements: filament, input grid, and anode output. Originally developed for telephony amplification by Western Electric USA and later by Standard Telephones UK as the 4300B, it soon found favor among audio enthusiasts for its exceptional sound quality. However, production ceased in the late 1980s, leading to a surge in demand for genuine 300B tubes, prized as collector's items. The resurgence of interest in SINGLE ENDED topology, particularly in Asia, led to the revival of 300B production in Chinese factories, with Russian and American manufacturers following suit. This revival underscores the enduring appeal of the 300B, its basic thermionic simplicity captivating enthusiasts and audiophiles alike, making it a beloved fixture in the world of audio reproduction.
Dragon Audio Cable Recommendation: We recommend pairing the Manley Lab's SE/PP 300B Monoblock Amp with the Silver Dragon Interconnect. Sold in Pairs, the Silver Dragon V2 is our top-of-the-line silver conductor-based interconnect. With a braided geometry and amazing shielding, this interconnect is a remarkable solution where noise isolation is key. The Silver Dragon is the original cable. Silver strands clarify instrument separation, increase soundstage, and find previously lost high and mid-frequency sounds. Transients appear more cohesive and the bass is tighter for a more controlled sound.
Features:
- Hand-Wound Output Transformers: Crafted with meticulous care in Manley Laboratories' own factory, the output transformers feature a complex design with exceptionally high primary inductance to ensure optimal performance.
- Versatile Output Stage: The amplifier utilizes a single-ended output stage, known for its uni-directional current and voltage flow, complemented by precision-switched negative feedback ranging from zero to 10 dB. This provides users with flexibility in tailoring the amplifier's performance to their preferences.
- Exceptional Cleanliness and Linearity: Even with zero negative feedback, the SE/PP 300B Monoblock Amp delivers unparalleled cleanliness and linearity, surpassing other single-ended amplifiers in performance.
- Variable Damping Factor: The amplifier offers variability in damping factor, allowing users to adjust damping to suit different speaker characteristics, room acoustics, and personal preferences.
- Precision Control: Users can fine-tune feedback settings in precise 1 dB steps, ensuring optimal performance in diverse listening environments.
- High-Quality Construction: Built with the utmost attention to detail, the amplifier features high-quality components, including gold-plated connectors, premium capacitors, and rugged chassis construction for durability and reliability.
- Flexible Integration: Designed to seamlessly integrate into a variety of audio systems, the SE/PP 300B Monoblock Amp offers compatibility with a wide range of speakers and sources, making it a versatile choice for audiophiles.
- Acclaimed Performance: The amplifier has garnered acclaim from critics in prominent audio publications, testament to its exceptional sonic performance and engineering excellence.
The layout of this amplifier embraces a deliberately retro aesthetic, characterized by its deep front-to-back dimensions and narrow side-to-side width. This design harks back to an earlier era, where the primary concern was to minimize interference from hum and noise in the octal input tubes by keeping the power supply at a distance. Similar considerations apply to the output tubes, which require careful spacing from the mains transformer and demand pure DC on their filaments. Vacuum tube rectification is employed to ensure a gradual voltage rise-time, maintaining fidelity to traditional methods. To meet modern performance standards, two rectifiers are used to accommodate substantial filter and reservoir capacitors, exceeding 1300 microfarads in the B+ rail, a significant improvement from the meager 4 or 8 microfarads utilized in the 1930s.
As other manufacturers began offering single-ended amps with 5 to 9 watts of power, Manley Laboratories recognized both the merits and drawbacks of this approach. While single-ended designs delivered superb mid-range and delicate detail, they faced limitations due to the scarcity of efficient speakers capable of forming a dynamically viable system. Furthermore, many of these single-ended amps were either prohibitively expensive or lacked specifications that could be taken seriously. Despite the growing popularity of single-ended amps among enthusiasts, some dismissed push-pull configurations as inferior. Manley countered such assertions, advocating for a nuanced approach that prioritized quality engineering and circuit design. While acknowledging the appeal of single-ended topology when executed properly, they recognized the potential of push-pull configurations when done right. To demonstrate our commitment to versatility, Manley Labs developed special circuitry that allows for seamless switching between 12 watts in parallel single-ended mode and 25 watts in push-pull mode, a feature that is unique in the industry.
The output transformer, meticulously hand-wound in Manley's own factory, features a complex design that prioritizes exceptionally high primary inductance. This is essential to offset the magnetic "gap" necessary for the uni-directional current and voltage flow characteristic of the single-ended output stage. Another key consideration in the single-ended triode narrative, currently experiencing widespread popularity, is the preference for minimal (or even zero) negative feedback. Manley Labs advocates for a balanced approach, believing in the judicious application of feedback to refine and optimize performance. The Neo-Classic SE/PP300B amplifier offers precision control over feedback, allowing users to adjust in precise 1 dB steps from zero to 10 dB. Even with zero negative feedback, this is one of the best single-ended amps on the market in terms of cleanliness and linearity.
An intriguing aspect of negative feedback is its influence on damping factor, conventionally believed to be better with higher values. However, experience has shown that the optimal damping factor is not necessarily infinity, but rather depends on factors such as speaker characteristics, room acoustics, and listener preferences. Manley Labs recognizes the value of variability in achieving the best sonic results, and their amplifier provides this flexibility. As seasoned amplifier builders, Manley Laboratories takes pride in the satisfaction their products bring, earning acclaim from critics in various reputable publications. It's important to consider factors such as power ratings, speaker sensitivity, and room size when selecting lower power amplifiers for loudspeakers, particularly those employing single-ended topology.
About Manley Laboratories:
Manley Laboratories, based in California, stands as a premier name in the audio industry, renowned for crafting high-end audio equipment that exceeds expectations. With a legacy spanning decades, their commitment to excellence is evident in every product they create. From professional-grade microphone preamps (micpre) with pristine XLR mic inputs to versatile direct inputs for guitars and vocals, Manley Laboratories ensures exceptional sound quality and versatility for any recording, performance, or music-listening scenario. They also create tube microphone preamplifiers (Tube mic preamp), limiters, headphone amplifiers with dual triodes, and more for all the headroom you need for pro audio and consumer audio applications. Their meticulous attention to detail extends to metering and compression, compressors, providing precise control over dynamics and ensuring optimal analog-like audio performance. Backed by a robust warranty, Manley Laboratories' audio interfaces and equipment offer peace of mind, promising reliability and longevity for years to come. Whether in the studio or on stage, musicians and audio professionals/enthusiasts trust Manley Laboratories to deliver unmatched quality and performance.
With features like high-quality RCA input jacks, variable output power options, and customizable input impedance/output impedance settings, Manley Labs ensures seamless integration and optimal performance in any audio system. The Neo-Classic 300B, a flagship model, exemplifies the brand's dedication to sonic excellence, delivering a lush midrange, exceptional signal-to-noise ratio, and unparalleled audio fidelity. Consider auditioning a Manley Headphone power amp for your hi-fi sound system.
F.A.Q
Q: What is the power output of the SE/PP 300B Monoblock amplifier?
A: The SE/PP 300B Monoblock amplifier has the unique ability to switch between 12 Watts in parallel single-ended mode and 25 Watts in push-pull mode. This adaptability ensures a delightful experience, catering to a variety of efficient speakers and discerning ears.
Q: What is the difference between single-ended (SE) and push-pull (PP) operation in this amplifier?
A: In single-ended operation, the amplifier utilizes a single output tube to amplify the signal, while in push-pull operation, two output tubes work together to amplify the signal, offering different sonic characteristics.
Q: Can I adjust the negative feedback level in the SE/PP 300B Monoblock amplifier?
A: Yes, the amplifier allows for precision control over negative feedback levels, with settings ranging from zero to 10 dB in precise 1 dB steps.
Q: What kind of tubes does the SE/PP 300B Monoblock amplifier use?
A: The amplifier uses 300B tubes in the output stage, known for their smooth and natural sound reproduction.
Q: Is the output transformer hand-wound in the Manley Laboratories factory?
A: Yes, the output transformer is meticulously hand-wound in the Manley Laboratories factory, ensuring exceptional quality and performance.
Q: How does the SE/PP 300B Monoblock amplifier compare to other single-ended amplifiers on the market?
A: The SE/PP 300B Monoblock amplifier offers exceptional cleanliness and linearity, even with zero negative feedback, surpassing many other single-ended amplifiers in performance.
Q: What kind of speakers are compatible with the SE/PP 300B Monoblock amplifier?
A: The amplifier is compatible with a wide range of speakers, but it is important to consider factors such as sensitivity and impedance matching for optimal performance.
Q: Can I use the SE/PP 300B Monoblock amplifier with both digital and analog sources?
A: Yes, the amplifier is designed to integrate seamlessly with both digital and analog sources, offering versatility in audio system setups.
Q: What is the warranty coverage for the SE/PP 300B Monoblock amplifier?
A: The amplifier is backed by a comprehensive warranty from Manley Laboratories, ensuring peace of mind and support for your investment. See the manual for more information.
Q: How does the SE/PP 300B Monoblock amplifier perform in terms of durability and reliability?
A: The amplifier is built with high-quality components and rugged construction, inspired by retro-themes, ensuring long-term durability and reliability for years of enjoyment.
| Parameter | Specification |
|---|---|
| Physical Specifications | |
| Dimensions | W= 8.5", D= 23", H= 9" (including projecting controls and parts) Minimum Mounting Surface: W= 7.5", D= 18" (feet footprint) |
| Shipping Weight | 41 lbs. each |
| Technical Specifications | |
| Vacuum Tubes | 2 x 300B (Output) 1 x 6SN7 (Driver) 1 x 6SL7 (Input) 2 x 5AR4 (Rectifier) Note: Units prior to 2011 used 5U4 rectifier tubes |
| Input Impedance | 100 kOhm, direct coupled |
| Optimum Speaker Load | 4 to 12 Ohm range (appropriate for 4 & 8 Ohm speakers) 12 to 20 Ohm range (appropriate for 16 Ohm speakers) Switchable |
| Badge Illumination | Pre-7/2003: 8V, 0.3A "Fuse-Lamp" 1/4" X 1 1/4" Post Serial #NSEPP314: LED illumination |
| Audio Specifications | |
| Output Power @ 1kHz (5 dB Feedback) | SINGLE-ENDED: 11 Watts @ 3% THD PUSH-PULL: 24 Watts @ 1.5% THD |
| Frequency Response (5 dB Feedback) | SINGLE-ENDED: 15 Hz - 15 kHz ±0.5 dB (measured at 5 watts) PUSH-PULL: 10 Hz - 20 kHz ±0.5 dB |
| Gain (SE Mode) | 0dB Feedback Setting: 30 dB 10dB Feedback Setting: 20 dB |
| Input Sensitivity (5 dB Feedback) | SINGLE ENDED: 700mV for Maximum Power 165mV for 1V output into 8 Ohms PUSH-PULL: 450mV for Maximum Power 160mV for 1V output into 8 Ohms |
| Signal-to-Noise Ratio | SINGLE ENDED: 83.5dB Ref. 1W (2.83V//8 Ohms, 20kHz BW, 5dB FB) PUSH-PULL: 85.4dB Ref. 1W (2.83V//8 Ohms, 20kHz BW, 5dB FB) |
| Dynamic Range | SINGLE ENDED: 94dB Ref. 3% THD (20kHz BW, 5dB FB) PUSH-PULL: 99.5dB Ref. 1.5% THD (20kHz BW, 5dB FB) |
| Output Impedance | SINGLE ENDED: 2.25 Ohms PUSH-PULL: 1.86 Ohms |
| Damping Factor | SINGLE ENDED: 3.5 PUSH-PULL: 4.3 |
| Power Specifications | |
| Maximum Power Consumption | 240 Watts |
| Mains Voltage Frequency | 50~60Hz |
| Mains Fuse | 100-120VAC: MDA 3 Amp SLO-BLO Ceramic Time-Delay fuse 220-240VAC: MDA 1.5 Amp SLO-BLO Ceramic Time-Delay fuse B+ Fuse: MDA 400 mA SLO-BLO Ceramic Time-Delay fuse |