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Kenwood KA-31

Stereo Integrated Amplifier (1983)

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Kenwood KA-31

Specifications

Power output: 30 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 100kHz

Total harmonic distortion: 0.09%

Damping factor: 25

Input sensitivity: 2.5mV (MM), 150mV (line)

Signal to noise ratio: 74dB (MM), 100dB (line)

Output: 150mV (line)

Dimensions: 440 x 87 x 236mm

Weight: 4.7kg

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Reviews

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rating
Reviewed Dec 01st, 2015 by guyub80

good vintage amplifier...got the warm sound but still didnt know what is the function of twin knob under the power knob...

 

Comments

colin44ct357's picture

kenwood/Trio KA-31B

First off i wish to thank everyone for posting the schematics as the site is a blessing from above.
All have helped me to repair 100's of amps and devices with the wealth of information.

At 56, turning back to old school amps at 50, I have a passion for retro audio and always will, I dont ever want one of these new digital synthetic clinical devices in my home besides a few like HK and Quad.
There are many British units which I like but so difficult to lay ones paws on.

At present i am sitting on a retro rework which someone else botched up, our worst nightmare as it takes days of my life.

I am looking for the parts list for a Kenwood KA31B.

There are a few schematics on the 31 design but none give a parts list and many discreet components have no values.

X07 2020 11.
PCB MARKED X07-2020-00, ON YOUR SCHEMATIC FOR THE 3 VERSIONS.
ZENER D4/D5 JUST NEXT TO THE 4 MAIN DIODES FOR THE SPLIT 15V PRE-AMP PSU.
I have found the links to the collectors were removed and the outputs were not grounded to the HS.
Hope i got it now...
Going to use st micro tip35/36c for drivers and bd 139/140 for pre drive,
have to sand the heatsink to supply the current.

Kind Regards
colin44ct357

colin44ct357's picture

kenwood/Trio KA-31B

First off i wish to thank everyone for posting the schematics as the site is a blessing from above.
All have helped me to repair 100's of amps and devices with the wealth of information.

At 56, turning back to old school amps at 50, I have a passion for retro audio and always will, I dont ever want one of these new digital synthetic clinical devices in my home besides a few like HK and Quad.
There are many British units which I like but so difficult to lay ones paws on.

At present i am sitting on a retro rework which someone else botched up, our worst nightmare as it takes days of my life.

I am looking for the parts list for a Kenwood KA31B.

There are a few schematics on the 31 design but none give a parts list and many discreet components have no values.

X07 2020 11.
PCB MARKED X07-2020-00, ON YOUR SCHEMATIC FOR THE 3 VERSIONS.
ZENER D4/D5 JUST NEXT TO THE 4 MAIN DIODES FOR THE SPLIT 15V PRE-AMP PSU.

Kind Regards
Cape Town SA

re: KA-891

deseo aportar el diagrama del modelo kenwood ka 891 por favor explicarme como hago.. ENVIADO!..

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