TRIO KA-5006

Commentary

Stereo pre-main amplifier with all stages directly connected + 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.

DLOA (dual low-noise operational amplifier) is used for the equalizer stage and tone control circuit.
The DLOA consists of a first stage differential amplifier, a buffer, a third stage Class A drive and a pure complimentary service. This realizes a high dynamic range, high input impedance, high power utilization factor, low impedance and low distortion factor.
Shock noise is also suppressed because the DC current at the output terminal is 0 V.

The tone control circuit has a defeat switch.

Equipped with high and low filters and muting circuits.

You can switch between stereo and monaural modes.

Equipped with 4 ch input / output terminal.

Model Rating

Type	Solid-state stereo premain amplifier
Power Amplifier Unit
Effective power	20 Hz to 20 kHz, both channel operation : 34W + 34W (8 Ω) 1 kHz Single channel operation : 56W/56W (4 Ω) 40W/40W (8 Ω) Both channel operation : 48W + 48W (4 Ω) 35W + 35W (8 Ω)
Music Power (IHF)	145W (4 Ω) 95W (8 Ω)
Total harmonic distortion factor (8 Ω)	0.5% (at rated output) 0.05% (Rated Output -3dB)
Cross modulation distortion factor	0.5% (at rated output) 0.08% (Rated Output -3dB)
Output Bandwidth (IHF)	10 Hz to 40 kHz
Residual noise (8 Ω)	0.5mV
Damping factor (8 Ω)	32
Optimum load impedance	4 Ω ~ 16 Ω
Preamplifier Section
Input Sensitivity / Impedance	Phono1, 2 : 2.5mV/50k Ω Tuner, Aux, Tape playA, B : 150mV/50k Ω 4 ch input : 150mV/50k Ω
Signal-to-noise ratio (IHF-A network)	Phono1, 2 : 82 dB (input 5 mV) Tuner, Aux, Tape PlayA, B : 90 dB 4ch input:90dB
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:140mV
Frequency characteristic	Tuner, Aux, and Tape play : 8 hz to 45 khz + 0 to 1.5 db Phono : RIAA deviation ± 0.5 dB
Tone control	Bass : ± 10 dB (100 Hz) Treble : ± 10 dB (10 kHz)
Filter	Low : 80 Hz, 6dB/oct. High : 7 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)	80W
External dimensions	Width 435x Height 157x Depth 300 mm
Weight	11kg