Lamplighter Posted September 23, 2009 Share Posted September 23, 2009 I am currently looking at an R300 amplifier which gave off smoke whilst in use in a field! It works to spec but has a resistor in each channel that is well cooked and open circuit. Markings are all black! Any chance of a circuit diagram or suggestion of value, R447, R547, appears they are 1 watt rating. Brian Link to comment Share on other sites More sharing options...
boswell Posted September 24, 2009 Share Posted September 24, 2009 I've got the user manual with block diagram if that is any use? Link to comment Share on other sites More sharing options...
Lamplighter Posted September 24, 2009 Author Share Posted September 24, 2009 I've got the user manual with block diagram if that is any use?Thanks for the offer, I downloaded a copy but it is not very helpful. I need information at component level.Brian Link to comment Share on other sites More sharing options...
KevinE Posted September 24, 2009 Share Posted September 24, 2009 The UK agent is CIE Audio in Nottingham, generally a friendly bunch! CIE Notts Link to comment Share on other sites More sharing options...
Lamplighter Posted September 24, 2009 Author Share Posted September 24, 2009 Kevin That is great, I'll give them a call in the morning.ThanksBrian Link to comment Share on other sites More sharing options...
Lamplighter Posted September 27, 2009 Author Share Posted September 27, 2009 To put this to bed, I spoke to a very helpful workshop engineer at CIE, who described the circuit and gave me the resistor values. The manual is now restricted by the manufacturer to prevent counterfeiting, apparently! Thanks to those who offered help, particulally Philip who offered to pull one out of his rack.Brian Link to comment Share on other sites More sharing options...
David Duffy Posted September 27, 2009 Share Posted September 27, 2009 Were the resistors in the output section, in series with a capacitor by chance? Link to comment Share on other sites More sharing options...
Lamplighter Posted September 28, 2009 Author Share Posted September 28, 2009 Were the resistors in the output section, in series with a capacitor by chance?Yes, 4R7 in series with capacitor, Zobel network. The original component is 2W but I think somthing more robust is needed. Have you had the same problem?Brian Link to comment Share on other sites More sharing options...
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