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Kenwood KA-7002

Solid State Stereo Integrated Amplifier (1971)

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Kenwood KA-7002

Specifications

Power output: 50 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 50kHz

Total harmonic distortion: 0.5%

Damping factor: 45

Input sensitivity: 2.5mV (mic), 2.5mV (MM), 200mV (DIN), 200mV (line)

Signal to noise ratio: 67dB (mic), 65dB (MM), 77dB (DIN), 77dB (line)

Dimensions: 330 x 133 x 278mm

Weight: 10kg

Year: 1971

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Reviewed Mar 04th, 2019 by boke

Got this amp with the wood sideburns in very good cosmetic condition ! Unfortunately, it came with a loud hum and intermittent pops and rustling noises. Recapped most of the boards, power supply (including both 4700uF biggies although rated at 63v - since the 50v was a little too close to the +- 45v operating level). Also replaced
all the 458 transistors with ksc1815's. Hum went away but still had the intermittent pops and hiss. Replaced all the transistors on the main amp board - no effect. Found an open resistor - replaced...no effect. Found a weird round diode open (found to be a Zener 14v 1/2w) - replaced. Turns out it's for biasing the DC offset cctry. Redid the DC offset...no more noises !!

DC bias at 23.5v across an emitter resistor for both sides. Hooked up to my computer Asus soundcard and Mirage M-390is speaks - AMAZING !! 3-D soundstage. Highs very clear and defined ! Lows full and tight ! Mids clear and balanced ! This is definitely a keeper.

 

Comments

re: KA-7002

Thank you for the information.

re: KA-7002

It is that i was looking for. thanks you very much.

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