djk Posted June 10, 2013 Share Posted June 10, 2013 The loudness issue needs to be ruled out. If it is the amplifier it will be as described above (cap fix). Quote Link to comment Share on other sites More sharing options...
babadono Posted June 10, 2013 Share Posted June 10, 2013 If it is the amplifier it will be as described above (cap fix). djk, I loooked at the schematics on line for this and you are correct. My hat's off to you. BTW what are the .01 caps C235,C236 at the input that are tied from ground to ground doing? RickTate, Are you up to digging into this and fixing it? Quote Link to comment Share on other sites More sharing options...
WMcD Posted June 10, 2013 Share Posted June 10, 2013 I think the 0.01 uF would be to keep radio freq out, particularly when there is no cable attached. They're too small in value to affect audio but at r.f. freqs they will be a short to ground. WMcD Quote Link to comment Share on other sites More sharing options...
babadono Posted June 11, 2013 Share Posted June 11, 2013 WMcD, I was trying to be funny. The schematic shows both ends of these caps attached to ground. Now either the schematic was drawn in error or these caps do nothing. babadono Quote Link to comment Share on other sites More sharing options...
djk Posted June 11, 2013 Share Posted June 11, 2013 "the schematic was drawn in error" They should have used a different ground symbol to distinguish chassis ground from signal ground (for those not familial with amplifiers). An audio amplifier will have typically three distinctive grounds; audio signal level ground, high current power supply ground, and chassis ground. We would like to keep signal grounds from being contaminated from high currents and RF. Quote Link to comment Share on other sites More sharing options...
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