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HCA-8300
Commentary

This is a stereo control amplifier developed to be paired with a power amplifier of the dynamic harmony system.

The equalizer circuit section adopts a 3-stage connected 7-chip configuration of first stage FET differential-PNP differential-constant current drive NPN.
The coupling capacitor uses a capacitorless (ICL) system for the input and a non-inductive metallized polyester film capacitor with superior high-frequency characteristics for the output to improve the frequency and phase characteristics.
In addition, low-noise FETs and high-voltage low-noise transistors are used to provide sufficient feedback for stability over a wide band to improve various characteristics.

The tone control circuit adopts a 3-stage direct connection 6-chip configuration of PNP push-pull with a first stage FET differential low-current drive, and realizes low distortion factor by using carefully selected low-noise FETs and high-voltage low-noise transistors.
In addition, the tone volume is lost at the center, and a method is adopted in which the tone quality can be continuously changed without waviness.
In addition, the volume can be adjusted separately on the left and right by the 2-axis volume, and the sound quality can be corrected by changing the turnover frequency or by the tone defeat switch.

The HCA 8300 employs a 32-contact detent volume with a new mask to improve the conventional trimming type detent volume, which has a drawback that the attenuation characteristic deviates from the standard value at every one step.
The attenuation characteristics can be adjusted in 2 dB steps from 0 to -30dB and in 3 dB steps from -30dB to -70dB. In addition, a four string gang volume is adopted to improve S/N when listening at a low volume.

Equipped with low filter circuit.
In addition, it is equipped with a 3-stage gain selector that expands the fine adjustment range.

The level of Phono1 can be finely adjusted.

The headphone amplifier circuit is built-in.

Muting is activated by the reed relay when power is turned on.

The rack handle used in the photo was sold as a separately sold option.

Model Rating
Type Stereo control amplifier
Circuit system Equalizer amplifier : First stage FET differential PNP constant current drive NPN3-stage direct connection ICL
Control Amplifier : First stage FET Differential Constant Current Drive PNP Push-pull 3-stage direct connection
Input Sensitivity / Impedance Phono1 : 2 to 6mV/50k Ω
Phono2 : 2mV/50k Ω
Tuner, Aux1, 2, Tape1, 2 : 100mV/50k Ω
Maximum allowable input Phono1 : 400 mV to 1,200 mV (RMS, 1 kHz)
Phono2 : 400 mV (RMS, 1 kHz)
Tuner, Aux1, 2, Tape1, 2 : 10 v or more
Output Level / Impedance Tape rec (pin) : 100mV/600 Ω
Tape rec (din) : 40mV/80k Ω
Pre out : 1V/600 Ω
Headphone : 70mV/90 Ω
Maximum output level Pre-out : 7 v or more
Rec out:20V
Frequency response (RIAA deviation) Phono1, 2 : 20 Hz to 20 kHz ± 0.2 dB
Tuner, Aux1, 2 : 5 Hz to 100 kHz + 0 to 1.5 dB
S/N (IHF, A Network) Phono1, 2 : 75 dB
Tuner, Aux1, 2, Tape1, 2 : 100 dB
Residual noise Pre out : 8 μ V
Headphone : 40 μ V
Distortion Factor (20 Hz to 20 kHz)
Phono1, 2 : 0.005% or Less (1 v)
0.01% or Less (20 v)
Tuner, Aux1, 2 : 0.005% or Less (1 v)
0.01% or Less (7 v)
Tone control
Bass: ± 10 dB (50 Hz, 100 Hz)
Turnover frequency : 150 Hz, 300 Hz
Treble: ± 10 db (10 kHz, 20 kHz)
Turnover frequency : 3 kHz, 6 kHz
Filter Low : 20 Hz, 12dB/oct.
High : 8 kHz, 6dB/oct.
Loudness control
(Volume -30dB)
+8dB(100Hz)
+4dB(10kHz)
Gain selector -5, -10, -20dB (can add)
Semiconductor used Transistor : 26
FET : 8
Diode : 16 pcs
IC : 2
Power supply voltage 100 VAC, 50Hz/60Hz
AC outlet Power switch interlock : 2 systems
Power switch not linked : 2 systems
Rated power consumption 9.5W (Electrical Appliance and Material Control Law)
External dimensions Width 435x Height 152x Depth 308 mm
Weight 6.5kg
Sold Separately Carrying Handle TA-2 (¥ 3,500)