LAMM ML3 Signature

Monoblock Power Amplifier / Pair

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The Lamm ML3 Signature combines the most sophisticated technologies and design with graceful styling reminiscent of the classic era of tubes. The ML3 represents Lamm’s top-of-the-line, zero-compromise product and one of the finest power amplifiers in the world. This model includes four chassis, with separate power supply and main units for both the left and right channel, rated for 32 watts of class A power per channel.

With the ML3 as the centerpiece of a high-end system, the recorded event is recreated in one’s listening room with astonishing realism. The listener experiences a ephemeral yet tangible connection to the essence of the music. The amplifier’s innovative circuitry enables it to recreate the original spectral balance and harmonic structure of the recorded material without losing even the tiniest details and nuances. Due to its extraordinary transparency, the ML3 is also unmatched its ability to recreate a three-dimensional soundstage without boundaries and limitations. The ML3 brings out the most natural sound performance inherent in the signal and unequivocally demonstrates what a properly designed single-ended amplifier can do.

Single-ended (SE) tube amplifiers, in general, have the potential to reproduce music with greater realism than any other amplifier type or topology. However, while these amplifiers can sound lovely in the midrange, their low and high frequency reproduction often leaves much to be desired. The ML3 is practically the only SE tube amplifier available capable of reproducing an entire range of audio frequencies. .

The most advanced technical solutions have been employed in the design of this amplifier. The ML3 circuit utilizes a very powerful direct-heated triode GM-70 (125W plate dissipation), a separate power supply and has no overall feedback. The custom-made output transformer is of peerless quality. The sophisticated power supply and unique front-end and output stages, enables the ML3 to drive most real-world speakers with tremendous sonic stability under the most dynamic conditions.

Features

- Innovative front-end circuitry (this design is unique to Lamm Industries, Inc.)

- Separate plate and filament transformers

- Six filter chokes

- Six rectifying tubes

- Highest quality film capacitors for the high voltage power supply that feeds the output stage

- Refined soft-start and time-delay circuitries

- An option to turn the amp on/off remotely

Each amplifier is carefully constructed and handcrafted of the finest materials and world-class parts, some of which include military-graded DALE metal film resistors, PRC wire-wound resistors, CADDOCK power film resistors, BOURNS multi-turn potentiometers, CORNELL DUBILIER and UNITED CHEMI-CON electrolytic capacitors, ELECTROCUBE, ELCON and ROEDERSTEIN film capacitors, HAMMOND chokes, gold-plated NEUTRIC and FISCHER connectors, heavy-duty gold-plated binding posts, and military-graded low-noise long-life vacuum tubes. Special attention was given to designing the plate, filament, and output transformers. They have no mechanical contact with either the transformer cover or the chassis and are suspended in a special encapsulant that almost completely absorbs residual mechanical vibrations. This plays a significant role in assuring the consummate clarity and micro-resolution of the ML3 during sound reproduction. The ML3 has no overall feedback loop, however the amplifier features an option that allows the user to introduce a small amount of local feedback in the output stage. Furthermore, there is a choice of two amounts of such feedback: NFB1 and NFB2, which differ in their levels. Therefore, there are three options regarding feedback use in the amplifier: no feedback, NFB1 or NFB2. A multi-turn trimming potentiometer allows the user to adjust and measure the plate current of the output tube via an external voltmeter.

Specifications

Output Power

- 32 Watts into 16, 8, or 4 Ohms.

Rated Output Power

minimum continuous sine-wave power, from 20Hz-20KHz with no more than:

- 0.3% THD (FTC) @ rated line voltage > 1 Watt into 16 Ohms.

- 3% THD (FTC) @ rated line voltage > 30 Watts into 16 Ohms.

- 0.3% THD (FTC) @ rated line voltage > 1 Watt into 8 Ohms

- 3% THD (FTC) @ rated line voltage > 30 Watts into 8 Ohms..

- 0.3% THD (FTC) @ rated line voltage > 1 Watt into 4 Ohms.

- 3% THD (FTC) @ rated line voltage > 30 Watts into 4 Ohms.

Rated Output Voltage

With continuous sine waves at 1KHz @ rated line voltage:

- 30.98 Volts peak into 16 Ohms, corresponding to 60 Watts peak.

- 21.91 Volts peak into 8 Ohms, corresponding to 60 Watts peak.

- 15.49 Volts peak into 4 Ohms, corresponding to 60 Watts peak.

Rated Output Current

with continuous sine waves at 1KHz @ rated line voltage:

- 1.94 Amps peak into 16 Ohms, corresponding to 60 Watts peak.

- 2.74 Amps peak into 8 Ohms, corresponding to 60 Watts peak.

- 3.87 Amps peak into 4 Ohms, corresponding to 60 Watts peak.

Maximum Output Power

Maximum continuous sine-wave power, at 1 KHz, with no more than:

- 5% THD (FTC) @ rated line voltage > 37 Watts into 16 Ohms.

- 5% THD (FTC) @ rated line voltage > 37 Watts into 8 Ohms.

- 5% THD (FTC) @ rated line voltage > 37 Watts into 4 Ohms.

Maximum Output Voltage

With continuous sine-waves at 1Khz @ rated line voltage:

- 34.41 Volts peak into 16 Ohms, corresponding to 74 Watts peak.

- 24.33 Volts peak into 8 Ohms, corresponding to 74 Watts peak.

- 17.2 Volts peak into 4 Ohms, corresponding to 74 Watts peak.

Maximum Output Current

With continuous sine-waves at 1Khz @ rated line voltage:

- 2.15 Amps peak into 16 Ohms, corresponding to 74 Watts peak.

- 3.04 Amps peak into 8 Ohms, corresponding to 74 Watts peak.

- 4.3 Amps peak into 4 Ohms, corresponding to 74 Watts peak.

Small Signal Frequency Response At 1 Watt into 16 Ohms @ rated line voltage:

- (0, -3dB) 8.5 Hz – 32 KHz.

Frequency Response

- At 30 Watt into 16 Ohms @ rated line voltage:

- (0dB, -1.5dB) 20 Hz, 20 KHz.

Slew Rate

- Vout=61.96 Volts peak-to-peak of square-wave signal into 16 Ohms, F=10KHz @ rated line voltage: 5 Volts per microsecond

Rise Time

- Vout=61.96 Volts peak-to-peak of square-wave signal into 16 Ohms, F=10KHz @ rated line voltage: 10 microseconds

Fall Time

- Vout=61.96 Volts peak-to-peak of square-wave signal into 16 Ohms, F=10KHz @ rated line voltage: 10 microseconds

Noise

- Signal/Noise ratio ref. 4 Volts RMS into 16 Ohms (1 Watt): 2 Hz – 22 KHz: typically 86 dB. | A weighted: typically 92 dB.

- Signal/Noise ratio ref. 21.91 Volts RMS into 16 Ohms (30 Watts): 22 Hz – 22 KHz: typically 100 dB. | A weighted: typically 106 dB.

Voltage Gain

- 30 Watts into 16 Ohms: 25.78 ± 2% or 28.22 + 0.2dB.

- 30 Watts into 8 Ohms: 18.26 ± 2% or 25.2 + 0.2dB.

- 30 Watts into 4 Ohms: 12.89 ± 2% or 22.2 + 0.2dB.

IM Distortion (60Hz:7KHz 4:1) SMPTE:

- from 1-30 Watts into 16 Ohms @ rated line voltage: no more than 10%

- from 1-30 Watts into 8 Ohms @ rated line voltage: no more than 10%

- from 1-30 Watts into 4 Ohms @ rated line voltage: no more than 10%

Inputs

- Pseudo-balanced, non-inverting: 3-pin XLR connector.

- 3-pin XLR pin assignment: pin 1 = signal ground; pin 2 = non-inverting signal input; pin 3 = signal ground.

- Single-ended, non-inverting: gold plated RCA connector (connected in parallel with pin 2, non-inverting input of XLR connector).

- ONLY ONE OF THESE INPUTS SHOULD BE CONNECTED TO A PREAMPLIFIER AT THE SAME TIME!

Input Sensitivity

- 30 Watts into 16, 8, and 4 Ohms > 0.85 Volts RMS ± 2%

Input Impedance

- 41 KOhms shunted by 470pF.

Outputs

- Eight gold plated binding posts.

Output Impedance At 1 KHz:

- typically 6.2 Ohms; 16-Ohm tap.

- typically 3.1 Ohms; 8-Ohm tap.

- typically 1.55 Ohms; 4-Ohm tap.

from 30 Hz – 20 KHz:

- typically 6.2 +1.5/-0.1 Ohms; 16-Ohm tap.

- typically 3.1 +0.75/-0.05 Ohms; 8-Ohm tap.

- typically 1.55 +0.375/-0.025 Ohms; 4-Ohm tap.

Damping Factor

At 1 KHz:

- typically 2.58 re: 16-Ohm load.

- typically 2.58 re: 8-Ohm load.

- typically 2.58 re: 4-Ohm load.

From 30 Hz – 20 KHz:

- typically 2.58 +0.043/-0.5 re: 16-Ohm load.

- typically 2.58 +0.043/-0.5 re: 8-Ohm load.

- typically 2.58 +0.043/-0.5 re: 4-Ohm load.

Operating Temperature

- Operating Temperature: -4 to +104 degrees Fahrenheit (-20 to +40 degrees Celsius) ambient.

Grounding

- Grounding (earthing) post and chassis connected to mains earthing.

Power Supply

- Nominal line voltage: 100-240 Volts 50/60Hz. Input voltage range: ±10%.

- Two power transformers, one filament transformer, six filter chokes, seven separate power supplies, six rectifier tubes.

- AC voltage intensively filtered by special RFI power line filter.

Power Supply Energy Storage

- Power Supply Energy Storage: Approximately 265 joules.

Front Panel Controls and Chassis Connectors & Controls

ML3

- Front Panel Controls: LED control.

CHASSIS CONNECTORS AND CONTROLS:

- MULTI-TURN TRIMMING POTENTIOMETER for setting the nominal value of plate current of the output tube V1.

- Set of TESTPOINTS for measuring the value of plate current of the output tube by using an external voltmeter.

- Plate FUSE for the output tube, along with corresponding fuse-folder.

- LOCAL NFB ON-OFF switch, allowing to introduce small amounts of local feedback in the output stage.

- NFB1 – NFB2 switch, allowing to vary the amounts of local feedback (2.4dB and 1.2dB, respectively).

- One input RCA connector, gold plated (located on the left side of the chassis).

- One input XLR connector, gold plated (located on the left side of the chassis).

REAR PANEL CONNECTORS AND CONTROLS:

- Eight gold- plated BINDING POSTS.

- PANEL RECEPTACLE, MALE for connecting the power supply cable.

ML3-PS

Front Panel Controls: LED control.

CHASSIS CONNECTORS AND CONTROLS:

Six RECTIFIER TUBES (V101 – V106).

REAR PANEL CONNECTORS AND CONTROLS:

- Power switch.

- AC POWER INLET.

- AC MAINS FUSE, along with corresponding fuse-holder.

- FRONT-END PLATE FUSE, along with corresponding fuse-holder

- PANEL RECEPTACLE, FEMALE, for connecting the power supply cable.

- Two DC POWER JACKS (central pin 2mm dia.) for connecting remote control/link cables.

- GROUNDING (EARTHING) POST (gold plated).DING POSTS.

Features

- AC voltage selector: 100/120/220/230/240 Volts internally switchable.

- Ultra low-noise power and filament transformers:

- Custom-made torodial power transformer has no mechanical contact with either the transformer cover or the chassis, as transformer is suspended in a special encapsulant which almost completely absorbs even the residual mechanical vibrations. This plays a significant role in assuring the absolutely unique clarity and micro-resolution during sound reproduction.

- Wide-band output transformer:

- Custom-made output transformer especially designed for handling high voltage power triodes and assuring the reproduction of a full spectrum of audio frequencies at any level of output power up to the maximum specified.

- Remote control:

Power on/off. Available remote link cable coordinates the remote functions of two or more amplifiers.

Safety/Protection:

“Soft-start” circuit protects power supply components from large in-rush currents when the amplifier is turned on. Unique delay time and electronic protection circuits secure the delay of approximately 2 minutes in supplying the plate voltage to the output tube, which extends the tube life span and excludes the unpleasant thumps or transients in the system during the amplifier turn on/off. Thermal resetting fuse controls internal temperature of the power transformer. Threshold: 248 degrees Fahrenheit (120 degrees Celcius)

- Fuses:

6.25 Amps slo-blo for 100/120 Volts (ML3-PS)

3 Amps slo-blo for 220/230/240 Volts (ML3-PS)

0.125 Amp slo-blo for on/off and remote control circuitry, internally mounted (ML3-PS)

0.125 Amp slo-blo Front-End Plate fuse (ML3-PS)

0.5 Amp fast-acting Plate fuse for the output tube (ML3)

General

- Power Consumption: Typically 400 Watts @ rated output @ 16 (8,4) Ohms.

- Burn-in Time at Factory: Minimum 72 hours.

- Recommended Burn-in Time in End-user’s System: Minimum 100 hours.

- Warm-up time: Minimum 25 minutes.

- Unit dimensions: 8.25 inches (21cm) high x 16 inches (40.64cm) wide x 20.375 inches (51.75cm) deep [add 1.4375 inches (3.7cm) of depth for handles located on rear panel]

- Crate dimensions: 26″ x 21″ x 14″ (66.04cm x 53.34cm x 35.56cm)

- Unit weight ML3: 79 Lb (35.9 Kg).

- Unit weight ML3-PS: 80.2 Lbs (36.41 Kg).

- Shipping weight ML3: 99 Lb (44.95 Kg).

- Shipping weight ML3-PS: 100.2 Lbs (45.5 Kg).

- Tube Complement ML3:

- V101 – 12AX7/ECC83, first amplification stage;

- V102, V103, V104, V105 – 6N30P-EV / 6H30П-EB (original), second amplification stage;

- V1 – GM-70, output stage.

NOTE: we recommend replacing GM-70 tube about once every 1.5-2 years to maintain the best performance of the amplifier.

Tube Complement ML3-PS: V101, V102, V103, V104, V105, V106 – 12AX3 / 12BE3, rectifier tubes

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LAMM ML3 Signature

Monoblock Power Amplifier / Pair