TRIO KA-9006

Commentary

This is a stereo pre-main amplifier which is the highest model and adopts all stages direct connection + pure complimentary service circuit.

The power amplifier consists of an all-stage direct-coupled circuit from the first stage to the last stage without the interstage coupling capacitor, a pure complimentary service circuit using the Darlington method of PNP-NPN for the output stage, and a ± 2 power supply system using the first stage differential-type.
As a result, various characteristics in the low frequency range have been thoroughly improved, and stable output has been obtained over the entire audible frequency range.

A limiter protection circuit is used to protect the transistors, and a relay is used to protect the speakers and prevent shock noise when the power is turned ON/OFF.
When the output terminal is short-circuited, the limiter level is lowered within 100m ・ sec to protect the transistor.

The equalizer uses a two power supply system in addition to the three stage direct connection system of the first stage differential circuit.

The tone control circuit is a two step switching type of the turnover frequency for both bass and treble.

The low filter is equipped with a subsonic filter and a rumble filter.
In addition, it has a high filter.

It has a two-stage switching muting mechanism and loudness control.

The impedance of Phono1 can be switched to two levels.

Equipped with a mode selector.

Since around 1975, carrying handles have been sold as a separately sold option.

Model Rating

Type	Solid-state stereo premain amplifier
Power Amplifier Unit
Effective power	20 Hz to 20 kHz, both channel operation : 70W + 70W (8 Ω) 1 kHz Single channel operation : 110W/110W (4 Ω) 85W/85W (8 Ω) Both channel operation : 95W + 95W (4 Ω) 73W + 73W (8 Ω)
Music Power (IHF)	300W (4 Ω) 200W (8 Ω)
Total harmonic distortion factor (8 Ω)	0.2% (at rated output) 0.05% (Rated Output -3dB)
Cross modulation distortion factor	0.2% (at rated output) 0.05% (Rated Output -3dB)
Output Bandwidth (IHF)	6 Hz to 45 kHz
Residual noise (8 Ω)	0.2mV
Damping factor (8 Ω)	30
Optimum load impedance	4 Ω ~ 16 Ω
Preamplifier Section
Input Sensitivity / Impedance	Phono1, 2 : 2.5mV/30k Ω, 50k Ω Tuner, Aux, Tape playA, B : 150mV/50k Ω Mic : 2.5mV/50k Ω 4 ch input : 150mV/50k Ω
Signal-to-noise ratio (IHF-A network)	Phono1, 2 : 84 dB (input 5 mV) Tuner, Aux, Tape PlayA, B : 95 dB 4ch input:95dB
Output Level / Impedance	Tape rec Pin : 150mV/50 Ω Tape rec Din : 40mV/70k Ω 4 ch out : 150mV/50 Ω
Maximum Allowable Input (1 kHz, RMS)	Phono:250mV
Frequency characteristic	Tuner, Aux, Tape play : 10 hz to 20 khz + 0 to 0.5 db Phono : RIAA deviation ± 0.5 dB
Tone control	Bass Turnover 200 Hz : + / - 10 dB (50 Hz) Turnover 400 Hz : + / - 10 dB (100 Hz) Treble Turnover 3 kHz : ± 10 dB (3 kHz) Turnover 6 kHz : ± 10 dB (10 kHz)
Filter	Low : 20, 40 Hz, 12dB/oct. High : 7 kHz, 12 kHz, 6dB/oct.
Loudness control (Volume-30dB)	+8dB(100Hz) +3dB(10kHz)
<General>
AC outlet	Power switch interlock : 2 systems Power switch not linked : 1 system
Power supply voltage	100 VAC, 50Hz/60Hz
Rated power consumption (Electrical Appliance and Material Control Law)	170W
External dimensions	Width 435x Height 157x Depth 300 mm
Weight	13.5kg
Sold Separately	Carrying Handle D-9 (1 pair, ¥ 5,000)