Luxman MB3045

1 9 7 5 1975
1 9 7 8 1978

High-end tube amplifier representing Luxman's heyday in the mid 1970s which quite probably existed in fifty slightly different versions and also had LuxKit equivalents.

Primary is made of four windings wound together to reduce leakage and distortion inherent to Class AB or Class B amplifiers ; the GX100-3.6 transformer can deliver more than 35W at 35Hz.

8045G power triodes
Specially developped in collaboration with NEC.
In Class B, the power dissipated on the plate can amount to 60W at 1Khz, thanks to its structure and high heat-dissipation metal.

Push-pull stage
Made of two 8045G triodes on which a negative feedback loop is applied.

DC driver stage
Of the cathode-follower type, uses newly developped 6240G double-triodes.

To rise the gain obtained by the driver stage, another 6240G double-triode is used here, with a 200V tension applied to the plate. A 5dB NFB is applied between the cathode and the 4th winding of the output transformer.

Differential amplifier
Its first stage uses a 12AX7 (ECC83) double-triode ; the second stage, DC-coupled with the first, gives an out-of-phase signal which is sent to the driver stage.

Power-supply section
GX100-3.6 Quadra-Filar output transformer (specially developped for the 8045G), C1744 low resistance choke self, two 220µF electrolytic caps.
After this stage, the filtered tension is applied to a bridge rectifier.

And then... wonderful music musically reaches your ears - providing you have two MB3045 for the latter is a monoblock.

Luxman MB3045, image 1 Luxman MB3045, image 2
Luxman MB3045 specifications
Title Value
Power : 1x 50W (8 / 16 Ohm, 0,3% THD, 20Hz...20Khz)
IMD : 0,3% (8 Ohm, 50W)
Frequency response : 10Hz...40Khz (-1dB)
Input sensitivity : 700mV
Damping factor : 16 (8 Ohm / 1Khz)
Noise floor : -95dB
Tubes : 2x 8045G
2x 6240G
1x 12AU7
1x 12AX7
Diodes : 4x U07N
4x RA1B
Dimensions : 37 x 24 x 17cm
Weight : 15,2kg.
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