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Akai AM-A3

Stereo Integrated Amplifier (1984-85)

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Akai AM-A3


Power output: 45 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.005%

Damping factor: 50

Input sensitivity: 2mV (MM), 150mV (line)

Signal to noise ratio: 72dB (MM), 95dB (line)

Channel separation: 55dB (line)

Speaker load impedance: 4Ω to 16Ω

Dimensions: 440 x 98 x 255mm

Weight: 6.15kg


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Burned Diode at Output Transistor

Has anyone seen this failure?

greg_sz's picture

Burned diode

Could you precise what diode is burned ?

There is no "output transistor" there as the power amp in this amplifier is STK4893 (hybryd integrated dual power amp).
if you give me the number Dnnn of the diode I can possibly help you.

In plus tell me what are the symptoms of your amp malfunction.

If there is no output power, possibly STK4893 has to be changed but causes of failure may be elsewhere.
Tell me the whole story how it happened and what is the effect to let me help you.


re: Burned diode

hi Greg,
I also got noise crack and no more signal after hearing (loudly) bass electronic music.
There has been some smell but nothing seems burnt.
Starting protection relay is not going on anymore.
There is 100VDC on power diodes bridge.
Can you drive me?

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