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Old 11-14-2017, 10:19 AM
Tangled Tangled is offline
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Kenwood KA-550D Amp Volume control

Hi All,

I've picked up a Kenwood KA-550D amplifier which I intend to use in a basic system in my office.

Before I start moving things around and start setting everything up I wonder if someone can help on the following, just in case its faulty.

On the volume control there is a separate rear rotating knob, which appears to be a balance control, just out of the top of pic it reads left right.
There is no separate balance control on this amp.

When I rotate the volume control, the rear knob also travels with it, both knobs are quite stiff, but they can be rotated independently.

If it's a balance control I would have thought it would have stayed in position.

Online manuals just refer to it as a volume control.

(I have another Kenwood amp which also has this rear knob, which remains in position but doesn't seem to affect volume, but it does have a balance control).

If anyone can advise before I start lugging stuff around it would be great.

The obvious thing for me to do is set it up and check it, but I'm trying to avoid that to save disruption.

Thanks All.
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Last edited by Tangled; 11-14-2017 at 10:41 AM.
  #2  
Old 11-14-2017, 11:09 AM
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kcbluesman kcbluesman is offline
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It is the balance control, and it has simply stiffened with age/dirt/oxidation. Deoxit 5, followed by Deoxit FaderLube will solve your problem. You will need to open the case to get to the ganged pots. In other words, they use a single shaft to control both the balance and volume pots. Cleaning and lubricating the pots will loosen things up and allow the balance to work independently from the volume.

Last edited by kcbluesman; 11-14-2017 at 11:12 AM.
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Old 11-14-2017, 11:56 AM
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NEMOaudio NEMOaudio is offline
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You haven't posted a usefull picture but the answer is easy.
That's a volume knob with separate left and right channel adjustment on the same axis (as printed above the knob).
In this case you have no separate balance control you adjust left and right channels independently if necesary.
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Last edited by NEMOaudio; 11-14-2017 at 12:04 PM.
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Old 11-15-2017, 12:37 AM
Tangled Tangled is offline
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Many Thanks Both,

I thought it was the separate balance control, just checking in case it was something more sophisticated. Will give it a good cleaning.

I

Last edited by Tangled; 11-15-2017 at 01:08 AM.
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Old 11-15-2017, 01:54 AM
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NEMOaudio NEMOaudio is offline
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Remember that they have to turn together even if you're holding only one of the rings.
You only need cleaning if it's noisy.
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Last edited by NEMOaudio; 11-15-2017 at 02:34 AM.
  #6  
Old 11-15-2017, 03:02 AM
Tangled Tangled is offline
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Quote:
Originally Posted by NEMOaudio View Post
Remember that they have to turn together even if you're holding only one of the rings.
You only need cleaning if it's noisy.
So, when I rotate the volume control knob, the rear balance control should travel with it and not stay in position?

(I should really do a quick rig up)
  #7  
Old 11-15-2017, 07:59 AM
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kcbluesman kcbluesman is offline
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The volume knob is supposed to turn independently from the balance knob. I dont know what nemo is talking about. Cleaning (deoxit) and lubricating (faderlube) will definitely help the two to turn independently more easily.
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