Power Amplifiers

The wonderfully simple 300B directly heated triode is virtually Lee De Forest's very first evolutionary 3-element piece, comprising only filament, input grid and anode output. Brought to reliable perfection by Western Electric USA and later by Standard Telephones UK as the 4300B, the 300B was very much intended and widely used for telephony amplification.Specifications:Vacuum Tubes: 2 x 300B (Output), 1 x 6SN7 (Driver), 1 x 6SL7 (Input),2 x 5AR4 (Rectifier). (Units prior to 2011 used 5U4 rectifier tubes.)Output Power  1kHz with 5 dB FeedBack in SINGLE-ENDED: 11 Watts  3% THDOutput Power  1kHz with 5 dB FeedBack in PUSH-PULL: 24 Watts  1.5% THDFrequency Response with 5 dB FB in SINGLE-ENDED: 15 Hz - 15 kHz ±0.5 dB (measured at 5 watts)Frequency Response with 5 dB FB in PUSH-PULL: 10 Hz - 20 kHz ±0.5 dBGAIN SE Mode 0dB Feedback Setting: 30 dBGAIN SE Mode 10dB Feedback Setting: 20 dBInput Sensitivity with 5db FB SINGLE ENDED: 700mV for Maximum PowerInput Sensitivity with 5db FB PUSH-PULL: 450mV for Maximum PowerInput Sensitivity with 5db FB SINGLE ENDED: 165mV for 1V output into 8 OhmsInput Sensitivity with 5db FB PUSH-PULL: 160mV for 1V output into 8 OhmsS/N Ratio: SINGLE ENDED: 83.5dB Ref. 1W; 2.83v//8 Ohms,20KHz BW; 5dB FB.S/N Ratio: 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.Dynamic Range: PUSH-PULL: 99.5dB Ref. 1.5% THD; 20KHz BW; 5dB FB.Input Impedance: 100 kOhm, direct coupled.Optimum Speaker Load (switchable): 4 to 12 Ohm range appropriate for 4 & 8 Ohm speakers - 12 to 20 Ohm range appropriate for 16 Ohm speakersActual Output Impedance SINGLE ENDED: 2.25 OhmsActual Output Impedance PUSH-PULL: 1.86 OhmsDamping Factor SINGLE ENDED: 3.5Damping Factor PUSH-PULL: 4.3Maximum Power Consumption: 240 WattsMains Voltage Frequency: 50~ 60HzPower transformer factory set for 100V, 120V or 220-240VAC operation for original destination country's mains voltage.Operating Mains Voltage changeable with power transformer re-wiring and fuse value change.Fuse type and ratings  117 VAC operation:MAINS fuse: 3 Amp 3AG slow-blow use glass body Littlefuse Series 239Fuse type and ratings  230 VAC operation:MAINS fuse: 1.6 Amp 3AG slow-blow use glass body Littlefuse Series 239B+ Fuse: MDA 400 mA SLO-BLO Ceramic Time-Delay fuseBadge Illumination: Units produced before 7/2003 use 8V, 0.3A "Fuse-Lamp" 1/4" X 1 1/4" - Serial numbers after NSEPP314 use LED illumination which probably won't burn outDimensions: W= 8.5, D= 23, H= 9 inches, Including projecting controls and partsMinimum Mounting Surface Dimensions: Feet Footprint = W= 7.5" D= 18"Shipping Weight: 41 lbs. Each.

The Manley 500 and 250 Watt Monoblocks are our most powerful push-pull production-models. Both the circuit design and the selected componentry have been refined over years and years of development. Reliability that you can depend upon combined with musical accuracy and emotional authority is what these amplifiers promise- and deliver. They are able to switch operation modes allowing the listener to choose between the sonically seductive qualities of triode and the more powerful Ultra-Linear configuration. We use big, beefy reservoir capacitors in the high voltage supplies giving plenty of instant energy for dynamic performance of transient peaks and bass impact and weight which often exceeds that of rival solid-state amplifiers.Specifications:ALL-TUBE monoblock design: uses 10 x EL34JJ output tubesDriver Stage: High current double 12BH7EH (x2) Electro-Harmonix RussianInput Tube: 12AT7EH large plate Electro-Harmonix RussianBALANCED & UNBALANCED inputs: RCA and XLR jacks (switchable)MUTE switch: on front panelTRIODE / Ultra-Linear output mode switching: on front panelSOFT-START turn on mode: minimizes in-rush current by first powering up amplifier to half voltagesEVER-WARM mode: for standby keeps tubes warmed up at half voltagesMANLEY Precision Output Transformer: designed and wound at Manley LabsFront panel bias measurement and adjust: Concealed under the black oval insertOutput Tube Standing Current: 27.5mASet Bias for: 275mVDC measured across each bias tip jack to groundLarge filter / reservoir capacitors: 3800uF x 2Angled rear of chassis: provides for easy connectionsWBT binding posts: CE compliant for European modelsInput Sensitivity RCA: Triode = 1.637 V, Tetrode = 1.837 V for full powerInput Sensitivity XLR: Triode = 3.2 V, Tetrode = 3.6 V for full powerInput Sensitivity Triode: 174mV for 1 watt into 8 OhmsInput Sensitivity Tetrode: 146mV for 1 watt into 8 OhmsGain Triode: 30dBGain Tetrode: 32dBInput Impedance RCA: 116 kOhm  1KHzInput Impedance XLR: 270 kOhm  1KHz - 20 kOhms  20KHz - 38 kOhm  20HzActual Output Impedance Triode: 0.538 OhmActual Output Impedance Tetrode: 0.465 OhmOptimum Speaker Load: 5 OhmsDamping Factor Triode: 14.8Damping Factor Tetrode: 17.2S/N Ratio Ref 1W into 8 Ohms: -80 dB -90dB A-WGTDynamic Range: 93dBFLAT frequency response: 10 Hz - 30 KHz continuousFull Power Tetrode: 250W  1.5% THD into 5 OhmsFull Power Triode: 100W  1.5% THD into 5 OhmsPower Consumption: 30 Watts in "EVER-WARM" modeMaximum Power Consumption: 815 Watts at full powerOperating Mains Voltage: Factory set for 100V, 120V or 220-240VAC operation for original destination country's mains voltage.Operating Mains Voltage: changeable with power transformer re-wiring and fuse value change.Mains Voltage Frequency:Mains Fuse 100-120VAC operation: MDA 10 Amp SLO-BLO Ceramic Time-Delay fuseMains Fuse 220-240VAC operation: MDA 8 Amp SLO-BLO Ceramic Time-Delay fuseB+ Fuse: MDA 1 1/2A SLO-BLO Ceramic Time-Delay fuseBadge Illumination: Units produced before 4/2003 use 8V, 0.3A "Fuse-Lamp" 1/4" X 1 1/4" - Serial numbers after N250188 use LED illumination which probably won't burn outPower Cord: Detachable IEC standard. Appropriate power cord supplied for destination countryDimensions: W=19" x D=13" x H=9"Shipping Weight: 73 Lbs. each

The Manley 500 and 250 Watt Monoblocks are our most powerful push-pull production-models. Both the circuit design and the selected componentry have been refined over years and years of development. Reliability that you can depend upon combined with musical accuracy and emotional authority is what these amplifiers promise- and deliver. They are able to switch operation modes allowing the listener to choose between the sonically seductive qualities of triode and the more powerful Ultra-Linear configuration. We use big, beefy reservoir capacitors in the high voltage supplies giving plenty of instant energy for dynamic performance of transient peaks and bass impact and weight which often exceeds that of rival solid-state amplifiers.Specifications:ALL-TUBE monoblock design 10 x KT90EH Electro-Harmonix Russian output tubesHigh current double 12BH7EH driver stage12AT7EH large plate Electro-Harmonix Russian input tubeBALANCED & UNBALANCED inputsMUTE switchTRIODE / Ultra-Linear switchingSOFT-START/ EVER-WARM standby modeMANLEY Precision output transformerFactory set for 5 Ohms nominalFront panel bias measurement and adjust (hiding under the black insert)Large filter / reservoir capacitors 3800uF x 2Angled rear of chassis provides for easy connectionsWBT binding postsInput sensitivity: 1VGain: 32dB tetrode; 30dB in triodeInput Impedance RCA: 116 kOhm  1KHzInput Impedance XLR: 270 kOhm  1KHz - 20 kOhms  20KHz - 38 kOhm  20HzNoise Floor: Tetrode: -67dB; Triode -65dB typicalS/N Ratio: -80 dBDynamic Range: 96dBFLAT frequency response: 10 Hz - 30 KHz continuousPower Consumption: 30 Watts in "EVER-WARM"Full power (tetrode): 500WFull power (triode): 275WFactory set for 100V, 120V or 220-240VAC operation for original destination country's mains voltage.Operating Mains Voltage changeable with power transformer re-wiring and fuse value change.Mains Voltage Frequency:Dims: W=19", D=13", H=9"Shipping weight: 82 lbs. each

The famous Manley Stingray stereo integrated amplifier has been renewed and refreshed. Allow us to present to you the Stingray II integrated tube amplifier with full featured RF and IR remote control.The STINGRAY II is the next evolution from our acclaimed Stingray Integrated Amplifier, legendary in the hifi world since it first swam from our labs in 1997. Originally conceived with particular attention paid to optimal component placement for the purity and symmetry of the signal path layout, the Stingray quickly became one of our best-selling products.Specifications:3 x Stereo Line RCA Inputs1 x Stereo Line 1/8" TRS mini-jack InputTRIODE - UL Output Stage Mode SwitchingRECORDING OUTSUBWOOFER OUTTAPE LOOP (Insert) with Bypass switch1/4" Headphone OUTPUT (mutes speakers and subwoofer output when deployed)Logic controlled Volume and Balance functionsAll-Vacuum Tube Lo-feedback Stereo Integrated DesignOutput Tubes: 8 x EL84 Ships with Russian NOS EL84M (aka 6Pi14Pi-EB)Driver Tubes: 2 x 6414 Ships with GE or RAYTHEON JAN NOS USA or 6414WInput Tubes: 2 x 12AT7EH Ships with: 12AT7EH large plate Electro-Harmonix Russian

Even with the advent of 7.2 and 9.2 channel surround sound systems, most of our customers still opt for tried-and-true 5.1 channel sound. Recognising this fact, Marantz designed and built this 5 channel power amplifier as the primary companion to their AV7005 preamp/processor, but it also partners well with any Home Theatre Receiver with appropriate outputs.If you want to step up to 7.2 or even 9.2 surround sound, then you can easily add one or more MM7025 140 Watt stereo (2 channel) power amplifiers to your system for more surround channels or multi-room audio.Behind the MM7055's elegant facade lies a muscular, yet refined current-feedback amplifier design that excels at reproducing both fine musical detail and hair-raising transient peaks.The MM7055 is comfortable driving high-performance speakers. If your preamp or A/V processor has XLR outputs, you can connect to this amp's XLR inputs and enjoy the superior sound quality they provide.Specifications:New stylish front design140W(8 ohms, 20Hz-20kHz) x5 Power AmplifierCurrent feedback power amplifier with marantz HDAM circuitXLR&RCA inputs x5chDetachable Power code

The MM7025 is this year’s ideal two-channel main amplifier with a whopping 140W rms into 8 ohms per channel. Use it in an AV setup to give your front channels an earth-moving boost or simply to make a sensational upgrade to an existing stereo system. And, because the technology is the same as that in the MM7055 and MM8003 using them in combination is fast, efficient and friendly. It’s a great flexible customisation enabler. And, as with the big brother MM7055, it also includes a new stylish display, XLR inputs, DC triggers and Marantz bus.Specifications:Power Output (8 / 4 Ohm RMS)140 W / 170 W (6)Power Output (8 / 4 Ohm DIN)-Power Output (8 / 4 Ohm IHF)-Bridged Power Output (8 Ohm RMS)-Frequency Response8 Hz-100 kHz (+-3 dB)Total Harmonic Distortion0.03% (20 Hz - 20 kHz)Damping Factor100Input Sensitivity: MM-Input Sensitivity: MC-Signal to Noise Ratio: MM / MC-Input Sensitivity: High level1.2 V / 22 KInput Sensitivity: Balanced High level2.4 V / 30 KSignal to Noise Ratio: High level105 dB 

Mονοφωνικός τελικός ενισχυτής με λυχνίες EL34Β.Προδιαγραφές:  Ισχύς: 80 wattAπόκριση συχνότητας: 16Hz-100KHz +-1 dBΠαραμόρφωση:

The C 245BEE is an amplifier with uncommon talent. With its four-channel architecture it can provide several system building options. Used with our C 165BEE preamp, it offers more than enough power to drive the loudspeaker of your choice with the interesting option to bi-amplify. Connected to the Zone Output of our AV Receiver, the C 245BEE can send different music programs to remote speakers. 4 x 35W Minimum Continuous Power into 4 / 8 ohms, all channels driven simultaneously, 20Hz - 20kHz at 0.03% THD (NAD Full Disclosure Power) 55W, 85W, 95W IHF Dynamic Power into 8, 4 and 2 ohms, respectively 2 x 70W Minimum Continuous Power into 8 ohms in Bridge Mode Channel A + B Switching ATOLogic 12 volt trigger/signal sensing input Line Level "Loop Through" Outputs Short signal path from input to output All sockets Gold-plated Multi-way Binding Post Speaker Outputs Detachable IEC Power Cable

.Lipinski power amplifiers are dual topology, which means there are two separate power amplifiers Inside. Our state-of-the-art power amplification uses dual topology: we employed dual mono design not only for the stereo amp, but also for our monoblocks. This is to control one parameter which has substantial influance on the perception of quality: the damping factor. This one controls the speed and accuracy of lowest frequencies, resulting in very tight and controlled bass. This configuration also significantly lowers distortion.The L-401 monoblock, due to the same dual topology design as the subwoofer amp, can be used in biamplificaion mode.  Bi-amp mode increases microdynamics.  The L-401 can also be switched for bridged mode, allowing for 600 Watts of unfettered power per channel.Since we believe that the best speaker cable is short cable, the L-401 is designed to be built into our speaker stand, making up the L-3601 Powered Stand.The stand fits directly underneath the L-707A Monitors.Be sure to check out our Reviews section for the latest review of our Monoblock, against Pass Labs and Bryston.SpecificationsOutput power: 1 channels: 200W @ 8ohms, 300W @ 4ohms,Gain: 30/35dB,Bandwidth: 1Hz–50kHz -3db,Integrated high pass filter optimized for L-505A/L-707,THD+noise: 0.01% THD @ 50W,

Lipinski power amplifiers are dual topology, which means there are two separate power amplifiers Inside.The L-400 subwoofer amplifier works in parallel mode, which significantly enhances damping factor - the most important parameter to control low frequencies.This surpasses commonly used bridge mode which significantly lowers the damping factor.        SPECIFICATIONS Output power: 1 channels: 200W @ 8ohm, 300W @ 4ohm, 400W @ 2ohm,1 Ohm stable,Gain: 30-40dB,Bandwidth: 1Hz–150Hz,Integrated low pass filter optimized for L-505A/L-707,THD+noise: 0.01% THD @ 50W, 1000 below 100Hz,Input impedance: 10kohms,Inputs: 2x XLR, 2x RCA,Multi color front glass light,Dimensions: 17.3"H x 3.1"W x 8.7"D (44cm x 8cm x 22cm),Weight: 33 lbs (15 kg).

From the demands of massed chorale to full-on rock and roll, the MC2301 delivers the most extraordinarily lifelike and dynamic performance ever heard from a McIntosh tube amplifier. With an output of 300 Watts, it provides enough high power to drive even the most demanding loudspeaker. And thanks to our patented Unity Coupled Circuit output transformer, this full 300 Watts is available to 2, 4 or 8 Ohm speakers.The MC2301 is the first McIntosh vacuum tube amplifier to use our Quad Balanced design. This design cancels virtually all noise and distortion in the audio signal. As a result, even when amplified to high levels the signal is effectively free of any distortion. Our fuse-less short-circuit protection circuit Sentry Monitor™ disengages the output stage before current exceeds safe operating levels and then resets automatically. Inputs for balanced and unbalanced cables are available to provide flexibility in connecting the rest of your audio system.The attractive blue meter is flanked by two rows of output vacuum tubes that bring even more visual appeal to the front panel to go along with the knobs and brushed aluminum handles that all effortlessly blend with the polished stainless steel chassis. The MC2301 is well suited for stereo music systems.

The monoblock MC611 Quad Balanced Power Amplifier produces 600 Watts of power – enough to satisfy nearly any loudspeaker. A pair of MC611s can easily drive an impressive home stereo system, or add more of them to power a home theater. Thanks to our unique output Autoformer™ technology, your speakers will receive the full 600 Watts regardless if they have 2, 4 or 8 Ohm impedance, allowing you the ability to use the MC611 to its full potential.The MC611 has received numerous updates and improvements compared to our previous 600 Watt monoblock model. Chief among them is that filter capacity has been doubled which has resulted in a dramatic 55% increase in dynamic headroom from 1.8dB to 2.8dB. This twofold increase in filter capacity also helps improve the performance of low end bass frequencies.The front panel features new direct LED backlighting for improved appearance and color accuracy. On top, the audio Autoformer and power transformer remain seated just behind the front panel, but are now contained in new glass topped enclosures. Behind them are 2 of our Monogrammed Heatsinks™ which connect to advanced high current output transistors that help eliminate thermal equilibrium lag time. A screening of the amplifier’s block diagram has been added to the panel located between the heatsinks.On the back, there continues to be 3 sets of our Solid Cinch™ speaker binding posts (1 set for each speaker impedance), but more space has been added between each set to allow for easier speaker cable management. Our eco-friendly power management system, which will turn the amp off after a set amount of time when no input signal has been detected, has also been added. Other enhancements include heavier gauge internal wiring and upgraded circuit components.In addition to all these improvements, the MC611 is full of other exclusive McIntosh technologies:Power Guard® that monitors and adjusts the input signal at the speed of light and makes real time adjustments to prevent harsh sounding and potentially speaker damaging clippingSentry Monitor™ - our fuse-less short-circuit protection circuit that disengages the output stage before current exceeds safe operating levels and then resets automatically when operating conditions return to normalQuad Balanced design that cancels virtually all noise and distortion that may have crept into the audio signalPower Control to send power on/off signals to other connected McIntosh components for easy system power up and shutdownBoth a balanced and unbalanced output are included to make bi-amping or tri-amping your speakers easier; they can also be used to send the audio signal to a secondary system if your preamplifier does not have enough outputs, or to connect a powered subwoofer. The MC611 sits on a beautiful polished stainless steel chassis and features the timeless McIntosh aesthetic of a black glass front panel, illuminated logo, control knobs, aluminum handles and of course a large 8” (20.3 cm) fast responding blue Watt meter. Contact your local dealer to learn more."Natural, effortless control of dynamic swings, a linear power response throughout the frequency range, a true sense of fidelity to the recorded event, a Muhammed Ali-like speed and power propelling every note, deep authentic bass and a wonderfully human and palpable midrange with an organic, yet polished aural touch." - AudioStream"The MC611s offer massive power with minimal distortion at all frequencies, into any load. In doing so they are virtually unique… Easy going silky smooth sound, richly detailed and dynamically awesome." Awarded 5 out of 5 Globes. - Hi-Fi World"The MC611 is one of the most beautiful sounding amplifiers I’ve ever heard, and at the same time is one of the most realistic sounding amplifiers I’ve ever heard. And this continues to blow me away every time I turn the MC611s’ power on." Winner of Best of 2018 Blue Note Award. - Enjoy The Music