Thursday, September 7, 2017

LM Audio 845IA Premium

Product Features:

LM-845 Premium Integrated Amplifier is combined with two units. One is the amplifier unit and the other is Outputs unit. In the amplifier unit the main amplifier and power supply parts are included while in the outputs unit output transformer and speaker outputs parts are included. Amplifier unit and outputs unit are connected with two separate well built connectors and cables for which you can put up and down or left and right.

Thirty watts per channel, Single Ended design, Pure Class A Integrated Stereo Amplifier with 845 output power tubes.

All tube Integrated with 12AX7 input tubes, 310A signal amplification stage, 300B driver tubes and 845 output tubes.

Well selected and matched tubes. Tubes we chose are Shuguang 12AX7, Line Magnetic 310A, Shuguang 300B and Shuguang 845. No matter it is the Pre-stage or power stage of tubes we select and choose the best matching ones to use on the same unit of amplifier to get the best sound quality out of it.

Three pairs of Line inputs, One pair of Balance Input and One Pre-In are located on the back panel of the amplifier unit. Left and Right inputs take a way of balance design. All are separately arranged to lower the cross-talk between Left and Right.

Different from other inputs Pre-In offers you a possibility to connect to some other Preamplifier so that you can the LM-845 Premium as a power amplifier.

Speaker terminals for 4, 8, 16 ohm speakers are located on the back panel of the Outputs unit. Same as inputs speaker outputs are arranged in a way of balance and separate design too.

Two user bias controls for 300B and 845 have been used for bias adjustment and two meters has been added to the front plate to allow you to monitor bias with ease.

One Power Meter with two pointers is located in the middle of front plate to allow you to monitor the power output of each channel.

Negative Feedback switch is on the front plate that you can choose between two levels of NFB to enjoy the different sound outputs of the LM-845IA Premium tube amplifier. Under the state of MAX it has a better dynamic while as for MIN the sound output has a more density.

On the rear panel of the Transformer Unit there is a Phase Switch you can choose between Phase In and Out.

In LM-845 Premium it includes eight transformers. Two pieces of power transformers, two output transformers, two coupling driver transformers, two chokes. In order to have a stable and better power supply we have designed two pieces of specially designed Toroid power transformers in Balance. EI type of output transformers are installed in the outputs unit separately to lower interfere from the external radio frequency.

Japanese Audio grade ALPS volume potentiometer has been applied. RCA terminals are specially designed by Line Magnetic for the amplifier. It can reduce the signal loss during transition and guarantee the sound quality.

Standard with remote volume control.

Hand made construction with the finest point-to-point wiring.

SoftStart and time-delay circuit. (30 seconds).

Solid Aluminum design of the front with Piano lacquer painting of chassis. An elegant combination of black. Nice looking amplifier you do not want to miss.


Power output: 30W Class A Single Ended

Frequency response: 15Hz~35kHz (-1.5dB)

THD: 1% (1kHz)

S/N Ratio: 80dB

Input Sensitivity: 250mV 1000mV (Pre-IN)

Input Impedance: 100kΩ

Output Impedance: 4Ω,8Ω, 16Ω

Dimension (W×D×H):  (430 x 456 x 460) mm

Tube Complement: 12AX7×2、310A×2、300B×2、845×2

Net Weight: 62kg

Power Consumption: 350W