Когда National уже стал Technics — конец 1960х: 1965-72 Technics SU-10A SU-20A SU-30A SU-40A SU-50A

1966 Technics SU-10A 63'000Y 7,6 kg 420x140x250

1966 Technics SU-20A 135'000Y 23,5 kg 500-900 VA 380x185x370 12 (40) 0,15% 5 --100 k (16Om) 8-32 Om 6267, 12AU7, 2x 6BQ5, 10x 50H-B26

1968-72 Technics SU-30A National-Panas 74-79'500 Y / 1200DM 7,6 kg 420x150x250 35 5 — 50 k

1968-72 Technics SU-40A National-Panas 69'500Y / 1000DM 14,8 kg 360x150x330 24 0,15 22W 4 — 50 k

1969-72 Technics SU-50A National-Panas 95'000Y / 1450DM 13,5 kg 420x147x325 30 40W 0,1% 150 5 — 150 k

О чём нам говорит взгляд на его жопу тыльную часть: на ней нет акустических разъёмов.

"The first stereo control amplifier in the Technics series.
The amplifier is composed of a 2-stage NF circuit to obtain low distortion and large dynamic range.
By inserting a transistor ripple filter into the rectifier circuit of the heater for complete DC ignition, and by completely shielding the power supply, hum and noise are reduced.
The tone control section uses a new CR tone control that completely flattens at the midpoint of the volume.
In this circuit, only one C is operated at both rising and falling times, and the characteristic changes are flat without waviness. In addition, the changing point of the characteristic can be changed in 3 stages of both low and high sound.
A precision resistor of ± 1% is used for the equalizer circuit, and an error of ± 0.3 db or less db or less at 30 Hz and 15 kHz when each unit is.
In addition, the playback curve of the tape head terminal is adjusted to the characteristics of NAB, but it can be adjusted to the characteristics of individual heads.
A push switch is used for input switching, and the semi-fixed part can be adjusted from the front."

ПЕРВЫЙ девайс, названный "Техникс"!
Засунуто несколько транзисторов в схему стабилизации нагрева.
Ну и всё с ОООС — тогда так было модно, и, более того, считалось, что это — КРУТО !

Имел 2 наименовения:
Technics EAA-2006
Technics 10A
стоил 63'000 Y

УМ к нему переименовывался уже 2 раза:
Technics EAA-2007
Technics SU-2007
Technics 20A
стоил 135'000 Y

Кстати, ряды ламп, как фигуры на шахматной доске, тут НЕ ЗРЯ !

"High power stereo power amplifier with OTL circuit.
An OTL circuit is used for the circuit configuration. By wiring five new type 50HB26 beam tubes in parallel to the output tube, ordinary speakers can be directly connected.
We have also succeeded in reducing the distortion by minimizing the pre-NF distortion and limiting the amount of NF in the main loop to 30 dB or less. Moreover, by making the load resistance of each stage extremely small, the high-frequency characteristics are stable up to 200 kHz or more even without NF.
A 5-pole tube with excellent high-frequency characteristics is adopted in each stage, and large output can be taken out without strain up to high frequency.
The plates and screen power supply for the upper and lower stages of the SEPP are independent from each other, and the bridge method with small ripple voltage is adopted for the rectification of each plate stage, thereby suppressing hum during small output.
Equipped with a 2-stage switching mechanism that can switch between high output and low output."

Он — ОТЛ ! Т.е. БЕСТРАНСФОРМАТОРНЫЙ !

10x 50H-B26 В КАЖДОМ КАНАЛЕ !

SU-30 переименовывался уже 3 раза:
Technics EAA-2008
Technics SU-2008
Technics SU-30A
Technics 30A
стоил 74,000 — 79,500 ихних йен.

"This tube type preamplifier was developed using Technics technology.
The model number has been changed 3 times : EAA-2008, SU-2008 and SU-30A.

A ripple filter using a transistor is incorporated in the rectifier circuit of the heater to minimize hum noise by igniting with DC without ripple, and noise level is reduced by shielding the power supply and adopting low noise resistance.

The equalizer circuit consists of 3-stage NF type, and the buffer amplifier consists of SRPP (Shunt Regulated Push Pull) type cathode follower circuit.

In order to improve the accuracy of the playback characteristics of the equalizer circuit and to avoid unnecessary coloring, we use capacitors and resistors with precision within ± 1% error. In addition, the deviation from the RIAA curve is kept within ± 0.3 dB by measuring and adjusting each unit when it is assembled.

The volume employs a special 4-series volume that adjusts the output of the tone amplifier simultaneously, reducing residual noise.

The tone control circuit adopts Technics original system using special double volume.
In this method, when one side is in contact with the resistor, the other side is in contact with the silver conductor so that only one capacitor is inserted. Also, at the midpoint, both brushes are on the silver conductor so that flat characteristics can be obtained."

УМ к нему тоже переименовывался трижды:
Technics EAA-2009
Technics SU-2009/
Technics SU-40A
Technics 40A
стоил 65,000 — 69,500 ихних йен.

"Tube bulb type stereo power amplifier.
The model number has been changed 3 times : EAA-2009, SU-2009 and SU-40A.

The Mulard type is used for the circuit configuration. Low-noise tube 6267 is used for the first stage, and 12AT7 with low internal resistance and Takamasu depth factor is used for the driver stage.
The output transformer is equipped with a cathode winding. By applying a 6 dB cathode NF to the output tube, both the high output of the 5-pole tube and the low internal resistance of the 3-pole tube are achieved.
The NF of the main loop is 20 dB, and the distortion at the rated output is suppressed to 0.1% or less.

A circuit is adopted in the bridge which combines current feedback and voltage feedback, and the damping factor can be continuously varied up to + 0.5 ～∞～-3 without changing the gain.
With this variable damping factor function, you can select two levels by switching the switch : the whole band and the low frequency range of 500 Hz or less.

Inside the front panel, there are independent level controls on the left and right sides, a low-cut filter (15 Hz or less, 6dB/oct), a speaker phase switch and a speaker impedance switch."

Теперь: что же из себя представляет Technics SU-50A ?

Схемы на него нет. Но, наверное, и не надо?

Тоже трижды переименовывался:
Technics EAA-2010
Technics SU-2010
Technics SU-50A
Technics 50A

"This solid state pre-main amplifier was created by integrating the development technologies of the Technics 10A, 20A, 30A, and 40A tube type amplifiers.
The model number has been changed 3 times : EAA-2010, SU-2010 and SU-50A.

The main amplifier section uses a two stage differential amplifier circuit and an OCL circuit with a two power supply system. All stages are directly connected. The circuit configuration without an output capacitor improves low-frequency characteristics and improves stability and linearity.

The equalizer stage of the preamplifier amp section is composed of 3-stage direct connection NF type using low-noise PNP transistor, which solves the shortage of dynamic range and obtains high S/N.

The tone control circuit is based on Technics's original method using special double volume.
This system has a special structure that combines a silver conductor and a resistor. At the midpoint, both brushes touch the silver conductor, so that all capacitors are removed from the circuit to become a resistance-only circuit, resulting in a flat characteristic.

A protection circuit using four transistors and two diodes is mounted.
This circuit is equipped with an automatic control and protection device that detects the operating point of the power transistor to maintain safe operation, an automatic correction circuit for temperature changes, and an instantaneous recovery type so that even if an excessive current flows, the signal only clips and operation is not interrupted.

The front panel features push-button input selection buttons and a large volume knob to improve usability.
In addition, it uses a design in which the letters on the front panel come out when the switch is turned on.

The pre-out terminal is equipped with two systems, a Low terminal with a rated output of 1 v and a High terminal with a rated output of 5 v.

It is equipped with 4 AC outlets.

Equipped with two types of speaker connection terminals."

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