TRIO KA-6004

Commentary

This is a pre-main amplifier of the Hi-ATC series that has not only characteristics in the audible frequency band but also characteristics in the ultra-low frequency band.

All stages are directly connected + pure complimentary service circuit by ± 2 power supply system.

Metal cancel transistors are used in the first stage circuit and equalizer circuit of the pre-main amplifier.
The first stage circuit, equalizer circuit and tone circuit are made of low-noise type nichrome evaporated metal film resistor to suppress aging.

A block board is directly connected to various switches such as tone control and filter to eliminate unnecessary lead wires, thereby improving inductive hum and signal-to-noise ratio.

We have developed a shield wire that can be wrapped up to the ground part by improving the conventional shield wire to suppress the deterioration of sound quality caused by soldering of extra parts.

Equipped with high / low filter, muting, and tone defeat switch.

Model Rating

Type	Solid-state stereo premain amplifier
Power Amplifier Unit
Effective power	20 Hz to 20 kHz, both channel operation : 40W + 40W (8 Ω) 1 kHz Single channel operation : 70W/70W (4 Ω) 55W/55W (8 Ω) Both channel operation : 57W + 57W (4 Ω) 43W + 43W (8 Ω)
Music Power (IHF)	220W (4 Ω) 130W (8 Ω)
Total harmonic distortion factor (8 Ω)	0.3% (at rated output) 0.05% (Rated Output -3dB)
Cross modulation distortion factor	0.3% (at rated output) 0.05% (Rated Output -3dB)
Output Bandwidth (IHF)	10 Hz to 50 kHz
SN ratio (closed circuit)	110dB
Residual noise (8 Ω)	0.3 mV (0.012 μ W)
Input Sensitivity / Impedance	1.0V/50k Ω
Optimum load impedance	4 Ω ~ 16 Ω
Damping factor	32
Output terminal	Speakers and headphones : 4 Ω ~ 16 Ω
Preamplifier Section
Input Sensitivity / Impedance	Phono1, 2 : 2.5mV/50k Ω Tuner, AUX, Tape PlayA, B : 200mV/100k Ω MIC : 3mV/50k Ω
Signal-to-noise ratio	Phono1, 2 : 68 dB Tuner, AUX, Tape PlayA, B : 75 dB MIC:70dB
Maximum Allowable Input (1 kHz)	420mV(P-P)
Output Level / Impedance	Tape Play A, B Pin : 200mV/50 Ω Din : 40mV/50 Ω Pre Out: 1V/100 Ω or less
Frequency characteristic	Tuner, AUX, Tape Play : 20 Hz to 50 kHz ± 1 db Phono1 and 2 : RIAA deviation ± 0.3 dB
Tone control	Bass : 100 Hz ± 10 dB Treble : 10 kHz ± 10 dB
Filter	Low : 40 Hz, 80 Hz, 12dB/oct. High : 7 kHz, 6dB/oct.
Loudness control (rated output -30dB)	100Hz:+8dB 10kHz:+3dB
<General>
Power supply voltage	100 VAC / 117 V, 50Hz/60Hz
AC outlet	Power switch interlock : Route 3 Power switch not linked : 1 system
Rated power consumption (Electrical Appliance and Material Control Law)	105W
External dimensions	Width 435x Height 153x Depth 300 mm
Weight	11.5kg