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Sugden A48, one channel keeps cutting out. Sound restored by increasing volume but at low volume goes again.

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The volume control may need to be cleaned. Find a spray cleaner made for electronics, relays, ect. and spray it into the volume control from the back side of it where it connects into the circuit board. After getting the cleaner into the volume control, work it in by turning the control back and forth over and over again. Do all of this with the power unplugged from the unit. After you finish cleaning the volume control, plug it back in and turn it on and then check to see if it is working normal. Volume controls can get oxidized and dirty after a few years and require cleaning. I hope this helps, let me know if you need any further help.

Dave

Posted on Oct 14, 2008

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I need a schematic diagram for a Sugden A48 Integrated Amplifier.


Here is the service manual including the schematic for you and can be downloaded for free:

http://elektrotanya.com/sugden_a48.pdf/download.html

After the page is appeared fully, click on this place:

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and the downloading will begin.
Thanks.
gylacz

Jul 13, 2011 | Audio Players & Recorders

1 Answer

NAD 3020 amplifier cuts out on one channel as the volume increases with an audible click When the volume is reduced to zero, after a short time sound is available again on the faulty channel but cuts...


Swap the speakers to see if it correlates.

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

Apr 23, 2011 | Audio Players & Recorders

1 Answer

On clean channel when 'channel volume' is adjusted, the sound cuts out, goes completely dead. I have to switch to another channel and back again or switch off and back on. The amp seems to get confused!


When it is working, wiggle the channel volume control WITHOUT rotating. If the sound cuts out, likely the soldering of the pot leads is broken where it attaches to the board. Try resoldering the connections.

SOMETIMES the control is damaged in which case it must be replaced.

Aug 30, 2010 | Line 6 Spider Iii 15 Modeling Guitar...

1 Answer

Sugden a21a - intermittent loss of channel - fading in and out sometimes left, sometimes right. Always corrects temporarily when fiddle with function knob or quickly turn up volume when it bursts forth....


had exactly the same problem myself, changed the balance, and the selector until Sugden suggested the relay. this did the job, and my amp is sorted. Shouldv'e changed this in the first place. Good as new. Shaun

Mar 14, 2010 | Audio Players & Recorders

1 Answer

Speakers shorting out


at medium volume push the speaker cone with your hand ( be gentile and push it several times) if the speaker make sound again then the problem is the spaeker and must be replaced , if its possible switch the speakers from one channel to the other channel to see if the problem is the speaker or the output channel

Feb 26, 2010 | Audio Players & Recorders

1 Answer

I have a sugden a48 1976 amplifier,can i attach a cd player


well you can but, use a din input with 4 poles pin1 is power, 2 is Right (red), 4 is left (white), 3 is gnd, use a adpater from din 4 poles and rca connector.

Jan 08, 2010 | Sugden A21SE Amplifier

1 Answer

I have sugden a48 1976 can I attach cd player


Yes - connect the CD outputs to the Auxiliary inputs. I have PDF diagram of plug connections if you don't have original manual that came with your amp. I will try to upload it to the manuals section of this site

Jul 01, 2009 | Sugden A21SE Amplifier

2 Answers

Amp 100 Line 1 in problem


Hi JamesOBrien

That is a strange problem you have indeed. The amp switches automatically from one input to the other, with default to input 1. You say the source sound dips low, is this a source from another integrated amp, where the AMP100 is working as a zone 2 device? . Are you using it as a zone 2 amp, and plugging other devices in the zone 2 area? and lastly, are you using auto on functions? Let me know, and we may be able to figure it out for you.

If it is new, then it may be worthwhile swapping it over for another by the supplier of the amp

regards
Graeme

Mar 31, 2008 | AudioSource AMP-100 2-Channel Amplifier

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