LUXKIT A3300

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.

Equipped with an attenuator that can attenuate the gain by 20 dB.

It is equipped with a pure complimentary service type headphone amplifier composed of 4 transistors.
This circuit automatically switches the output of the pre-section to the headphone amplifier when the headphone is inserted.

A3300 does not have a built-in power supply.
For this reason, a special power supply or a power amplifier such as A3500/A2500 is required.

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)