Listing Detail Tabs

Yamaha A-420 [6th unit] stereo amplifier - black :

Mid 1980s low profile stereo amplifier, no remote control

MM, MC phono preamps

Well tested prior to listing, including phono function

This amp is very powerful : behaves like a 70W - 80W amp

Cosmetic condtion is very good

Specifications :
1985 vintage
Power : 50W RMS at 8 ohms with THD distortion 0.015%
Power bandwidth : 10Hz to 50kHz [THD 0.03%, 25W, at 8ohms]
Dynamic power : [DIN, 1kHz, 1% THD, 4ohms]: 112W, dynamic headroom at 8ohms: 1.12dB, [IHF at 8ohms / 6ohms]: 97W / 120W
Input sensitivity / impedance : [Aux / tape / tuner / cd]: 150mV / 47kohms,
Phono MM: 2.5mV / 47kohms, MC: 160µV / 220ohms
Output level / impedance [rec out] : 150mV / 470ohms
Headphones output : 0.7V / 270ohms [0.01% THD, 8ohms]
Frequency response : [Tape / tuner / Aux /cd] : 20Hz to 20kHz +0dB / -0.5dB
Damping factor : 50 [1kHz, 8ohms]
Phono RIAA equalization : MM: ±0.2dB, MC: ±0.3dB
Total Harmonic distortion [20Hz to 20kHz] : [Aux / tape / tuner / cd to speaker out, 1W, 8ohms]: 0.005%, MM: to rec out, 3V : 0.003%, MC: to rec out 3V : 0.007%
Signal to noise ratio : [Aux / tape / tuner / cd]: 100dB,
MM: 92dB [5mV, input shorted], MC: 75dB [500µV, input shorted]
Speaker outputs : A, B front switched
Tone controls : Bass: ±10dB at 20Hz, [turnover frequency: 350Hz],
Treble: ±10dB at 20kHz [turnover frequency: 3.5kHz]
Low filter : 15Hz, -12dB / octave
Loudness control : continuous level related equalization : 40dB at 1kHz
Dimensions [W x H x D]: 435 x 136 x 339mm
Weight : 7.5kg - packed weight ~ 9kg
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  • Seller location: Whangarei, Northland, NZ

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