Luxman (Luxkit) A3300
¥ 45,000 (released in February 1972)
¥ 45,800 (around 1974)
Commentary
This tube type preamplifier kit was announced simultaneously with the launch of the LUX KIT brand.
The equalizer circuit is similar to the circuit used in the C-22 Macintosh, and consists of a
combination of a P-K / NF circuit (feedback from the second stage plate to the first stage cathode)
and a cathode follower circuit.
An orthodox circuit is used to adjust sound quality.
The low-cut filter is CR1-stage type, the high-cut filter is NF-type, and the tone control is
Lux-type NF-type with less waviness at the mid-point. The tone control can be adjusted
more precisely because the bending point frequency can be switched.
Model Rating
Type Tube type control amplifier kit
Output voltage Rating : 2 V (Distortion Factor 0.08% or Less)
Maximum : 15 v (0.5% strain rate)
Output impedance 950 Ω
Total harmonic distortion factor 0.08% or Less (Output 2 v)
Frequency characteristic 20 Hz to 20 kHz -0.5 dB
Input Sensitivity / Input Impedance
(at 1 V output) Phono1, 2 : 1.8mV/47k Ω
Aux1, 2, 3 : 130mV/150k Ω
Signal-to-noise ratio Phono1, 2 : 60 dB or more
Aux1, 2, 3 : 77 dB or more
Tone control LUX System NF Type with Bending Point Switching
Low-range bending point : 250 Hz, 500 Hz
High-frequency curve point : 2.5 kHz, 5 kHz
Filter Low-cut : 70 Hz (-6dB/oct.)
High Cut : 6 kHz (-6dB/oct.)
Attachment Headphone amplifier (output 50 mw)
Tape monitor circuit
Vacuum tube used 12AX7x4
12AU7x2
Semiconductor used 2SC735x4
2SA562x4
KB265x2
Power supply part External power supply system
A33 power supply or A3500/A2500
External dimensions Width 400x Height 130x Depth 245 mm
Weight 3.5kg
Sold Separately Dedicated Power Supply A33 (¥ 7,900)
Assembly Manual (¥ 500)
Luxman (Luxkit) A3500
¥ 59,500 (released in February 1972)
Commentary
A typical tube type main amplifier kit of LUX KIT.
The output transformer adopts OY15 type which is used for SQ38FD and MQ60, etc., and an
output of 40W is obtained by push-pull type ultra linear connection using 6CA7 for the output
tube.
In addition, 6L6GC and 50CA10 are designed to be used for the output tube with only slight
modification.
A cathode coupled circuit called a leak Mulard type is used for the driver circuit (phase inversion
circuit).
This circuit has the advantage of high gain, but it has the disadvantage of unbalanced gain
between upper and lower gain. The A3500 uses 6AQ8, which has high amplification, so that the
unbalanced gain can be ignored even if the plate resistance is the same between upper and
lower.
The A3500 has improved bare characteristics throughout the amplifier, ensuring excellent
characteristics without applying negative feedback of strength.
A unique MLF circuit (multiple loop feedback circuit) is used for the negative feedback circuit to
keep distortion low over the entire audible band and to maintain stability against
load fluctuations.
The power supply section uses a power transformer with sufficient space to accommodate various
output tubes, and the choke coil used to remove the ripple that causes the hum component is
designed for A3500.
The A3500 is designed to take out the power supply for the preamp. When combined with the
preamp kit A3300, it can be supplied by the connector cord.
Hood is included.
50CA10 / CR tube and kit were sold separately.
Model Rating
Type Bulb type power amplifier kit
Continuous effective output
6CA7 (5-connection, UL) :
6CA7 (3 connections) :
6L6GC: 40W+40W
20W+20W
40W+40W
Total harmonic distortion factor 0.5% or Less (1 kHz)
1% or Less (55 Hz, 10 kHz)
Frequency characteristic 20 Hz to 20 kHz - within 1 dB
Input sensitivity 750 mv (when 6CA7 / UL is connected)
Input impedance 250k Ω
Signal-to-noise ratio 90 dB or more
Residual noise 1 mV or less
Damping factor About 10
Attachment Input level set
Power connector for preamplifier (A3300)
Used vacuum tubes, etc.
Vacuum tube :
Semiconductors : 6CA7x4
6AQ8x3
* The output tube can be changed to 6L6GC or 50CA10.
SD-1Bx4
S1RB-40x1
1S1906x1
Power consumption 250W (simultaneous operation of both channels, maximum output)
External dimensions Width 465x Height 168x Depth 206 mm
Weight 16kg
Attachment Bonnet
Sold Separately 50CA10 / CR Tube / Kit TU35 (¥ 5,900)
Assembly Manual (¥ 500)
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