LUXMAN PL45

Commentary

A control amplifier developed with the aim of becoming the final version as the last tube type preamplifier.

The equalizer stage adopts the K-KNF type which constitutes the NF circuit from cathode to cathode.
This circuit method was used in the Marantz Model7 tz Model7. It was often used in high-end machines before that. Special attention is paid to the equalizer characteristics. By carefully selecting resistors and capacitors, the equalizer is kept below 0.5 dB.

You can vary the high-frequency range of the tape equalizer by 4 dB.

LUX type NF is used for the tone control, and a switching circuit for the bending point is added to it.
The adjuster is an attenuator type with five ascending and five descending steps. It is also equipped with a defeat switch to provide flat characteristics with one touch operation.

The filter is steep at 12dB/oct. to reduce the effect on the program source.

Switches developed for the PL45 have been adopted.

On the rear, there is a socket to insert a step-up transformer. By inserting a step-up transformer in this socket, a low-power MC cartridge can be used as is.
Equipped with 6421S as a standard, and 6400 series step-up transformer can be replaced if necessary.

Model Rating

Type	Tube type control amplifier
Distortion factor	Within 0.1% (Output 2 V, 1 kHz)
Frequency characteristic	30 Hz ~ 20 kHz ± 0.5 dB or Less (20 Hz or Less Cut)
Output voltage	2 v (rated) 10 v (max.)
Input Sensitivity (Output 1 V, 1 kHz)	Tape9.5 cm : 0.6 ~ 3.2 mV Tape19cm : 0.7 ~ 3.5 mv Phono1 : 0.6 to 3.2 mV Phono1 (input transformer) : 0.02 to 0.1 mV Phono2 : 0.6 to 3.2 mV Aux1/2 : 70 mv ~ 360 mv Mic, Center mic : 1.5 to 7.6 mV
Input impedance	Tape (9.5cm/19cm) : 100k Ω Phono1/2 : 50k Ω Phono1 (input transformer) : 60 Ω Aux1/2 : 200k Ω Mic : 200k Ω
S/N ratio (IHFM standard)	Tape : 80 dB or more Phono : 80 dB or more Mic : 80 dB or more Aux : 90 dB or more
Equalizer characteristic	NAB (9.5cm/19cm) : 30 Hz to 15 kHz ± 0.5 dB or less * Variable between ± 4 db at 10 khz RIAA : 30 Hz to 15 kHz ± 0.5 dB or less
Tone control	LUX System NF Type, Step Type Low-pass curve point : 150 Hz, 300 Hz, 600 Hz High-frequency bending point : 1.5 kHz, 3 kHz, 6 kHz With Defeat Switch
Filter	Low Frequency Cut : 50Hz/100Hz, 12dB/oct. High Cut : 5kHz/9kHz, 12dB/oct
Accessory function	Tape monitor DIN record reconnector AC outlet Booster transformer insertion socket
Semiconductors used	Vacuum Tubes (8 pcs) : 12AX7Tx6 pcs 12AU7x2 Pieces Diodes (4) : SE150a : 2 SM150d : 2
Power consumption	33W
External dimensions	Width 476x Height 180x Depth 275 mm
Weight	12.3kg
Attachment	Step-up transformer 6421S
Remarks	Step-up transformer Model Name Impedance ratio Boost ratio 6422S 60 Ω : 5k Ω About 10 times 6422X 60 Ω : 60k Ω Approximately 35 times 6421S 6 Ω : 5k Ω Approximately 30 times