Kenwood amplifier a-58

Question edited for maker name.
Question moved to Kenwood.

Sounds like bad capacitors that perk up when they get warm.

Or the volume control needs cleaning with electrical switch cleaner.

Kenwood.com

Your resistors at the volume control are either going bad or you need to replace the volume control its self.

hi i have bought kenwood hi fi with following parts -
integrated amplifier - A-58
cd player - DP-M58
stereo receiver - T-58L
twincassette player - X-58
turntable - P-38
but I can't get owner manuals from anywhere. Can you help me with it please ? [email protected]

It's the battery, not enough juice to supply your amp at loud volumes so the bass will drop out especially on long bass notes. Replace your battery!

Ideally your volume control potentiometer should be replaced.
You may get a temporary repair by carefully spraying switch cleaner into the control and giving it some "exercise" however, this will only delay the inevitable.

Hi,

That must be a dirty volume control (potmeter).
Or there's a lose contact on the PCB which is soldered to your volume control (potmeter).

regards,
Gerard

The most common cause of this is corrosion on the output speaker relay contacts. A simple test can confirm this: When the channel drops out, try turning up the volume. If the channel kicks in again, the relay contacts are the likely problem. The higher volume generates a higher voltage which essentially "jumps the gap" and restores contact.

Keep us posted.

Da n

mine does the same and it cost 100 pounds to have the output chips replaced

I had this same exact problem when my last older Kenwood Marine stereo cooked itself while I had it up loud for a few weekends on the lake. (smelled like it had burned inside). I went out and bought a new Kenwood KMR-550u stereo deck. (I do not have an additional amp). I hooked it up to the exact connections where my older Kenwood stereo unit had been hooked up, as I never had a problem with this for the past three years until it failed after smelling of burning elelectrical. I had chalked the problem up to heavy rain we had one day. Every time I turned up the volume, sometimes up to 27 out of 35 possible, or 29, or 32, the stereo would suddenly shut off as if I had turned it off. After a few seconds the stereo would come back on, but unless I was quick enough to turn down the volume it would do it again right away. Of course on a boat, we were beached in a cove and the engine was not running when I encountered this. I searched the internet finding hundreds of similar complaints and several dozen theories of all types, but only a couple that pointed me towards the power (voltage) idea as the problem. I put a volt meter on the positive & negative wires powering the stereo. I watched as I gradually turned up the volume, the voltage on the power wire gradually decreased from 12.5 volts, down into the 11 range, and as it hit 10.9 or 10.8 volts it shut off typically around a volume of 32. The red power wire in my boat that never seemed to have an issue with my old stereo until it fried was determined to actually be inadequate for the power flow for the new Kenwood, and probably was the culprit of my failed older unit. I offer this sound advice: Run a new pair of positive & negative wires directly from the battery (with an appropriate fuse of course (the deck has a 10 amp fuse in it's back so I would use that at the battery) to the stereo. Check the voltage as you turn the volume up into the high 20's and low 30's to ensure you are still getting voltage in the mid to high 11-12 volt range. The stereo is designed to require a minimum of 10.8 volts to operate, and when it drops below that it protects itself and shuts down.