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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Bias Current for SONY TA-F246E
All,
I would really appreciate your help on this. I've had this amplifier for quite a while in storage and I have just started using it. I am really under the impression that the Bias Current is all wrong, however I really don't know what the correct setting is: could someone help me out on this? If the setting is not know, how can I figure it out??? many thx in advance Panos |
#2
Posted to sci.electronics.repair
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Bias Current for SONY TA-F246E
"Belbo" wrote in message oups.com... All, I would really appreciate your help on this. I've had this amplifier for quite a while in storage and I have just started using it. I am really under the impression that the Bias Current is all wrong, however I really don't know what the correct setting is: could someone help me out on this? If the setting is not know, how can I figure it out??? many thx in advance Panos 9 millivolts across the emitter resistor pair. Supposed to be done within 15 seconds of power-on. Mark Z. |
#3
Posted to sci.electronics.repair
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Bias Current for SONY Amplifier
Mark,
Many thx for your reply, a couple of clarification questions: 1) I've noticed by browsing around that there seems to be a learning that factory Bias current settings are low and there is an opportunity to increase the current (by as much as 200%!) without harming the amplifier, while enjoying superior performance. Is this true and should I try something like it with this amplifier based on your experience? 2) I assume that you have the service manual. In that case would you be kind enough to let me know the current (mA) for the 9mV setting? again, really really appreciate your help on this, Panos Mark D. Zacharias wrote: "Belbo" wrote in message oups.com... All, I would really appreciate your help on this. I've had this amplifier for quite a while in storage and I have just started using it. I am really under the impression that the Bias Current is all wrong, however I really don't know what the correct setting is: could someone help me out on this? If the setting is not know, how can I figure it out??? many thx in advance Panos 9 millivolts across the emitter resistor pair. Supposed to be done within 15 seconds of power-on. Mark Z. |
#4
Posted to sci.electronics.repair
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Bias Current for SONY Amplifier
"Belbo" wrote in message oups.com... Mark, Many thx for your reply, a couple of clarification questions: 1) I've noticed by browsing around that there seems to be a learning that factory Bias current settings are low and there is an opportunity to increase the current (by as much as 200%!) without harming the amplifier, while enjoying superior performance. Is this true and should I try something like it with this amplifier based on your experience? 2) I assume that you have the service manual. In that case would you be kind enough to let me know the current (mA) for the 9mV setting? again, really really appreciate your help on this, Panos Mark D. Zacharias wrote: "Belbo" wrote in message oups.com... All, I would really appreciate your help on this. I've had this amplifier for quite a while in storage and I have just started using it. I am really under the impression that the Bias Current is all wrong, however I really don't know what the correct setting is: could someone help me out on this? If the setting is not know, how can I figure it out??? many thx in advance Panos 9 millivolts across the emitter resistor pair. Supposed to be done within 15 seconds of power-on. Mark Z. I just temporarily downloaded the manual and looked it up. Don't have the model number any more, so could you re-post with the model number? Generally speaking, you can increase bias at least about 25 to 50% without really excessive heating - though this would not apply to some exotic or Class A designs. It's important to remember that solid state amps should not be allowed to run really hot. If you can't comfortably keep your hand in contact with the heat-sink indefinitely, it's too hot. Mark Z. |
#5
Posted to sci.electronics.repair
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Bias Current for SONY Amplifier
Model number is TA-F246E. Would really appreciate if you could forward
me the Service Manual to my personal email address, many thx again for your help on this, Panos Mark D. Zacharias wrote: "Belbo" wrote in message oups.com... Mark, Many thx for your reply, a couple of clarification questions: 1) I've noticed by browsing around that there seems to be a learning that factory Bias current settings are low and there is an opportunity to increase the current (by as much as 200%!) without harming the amplifier, while enjoying superior performance. Is this true and should I try something like it with this amplifier based on your experience? 2) I assume that you have the service manual. In that case would you be kind enough to let me know the current (mA) for the 9mV setting? again, really really appreciate your help on this, Panos Mark D. Zacharias wrote: "Belbo" wrote in message oups.com... All, I would really appreciate your help on this. I've had this amplifier for quite a while in storage and I have just started using it. I am really under the impression that the Bias Current is all wrong, however I really don't know what the correct setting is: could someone help me out on this? If the setting is not know, how can I figure it out??? many thx in advance Panos 9 millivolts across the emitter resistor pair. Supposed to be done within 15 seconds of power-on. Mark Z. I just temporarily downloaded the manual and looked it up. Don't have the model number any more, so could you re-post with the model number? Generally speaking, you can increase bias at least about 25 to 50% without really excessive heating - though this would not apply to some exotic or Class A designs. It's important to remember that solid state amps should not be allowed to run really hot. If you can't comfortably keep your hand in contact with the heat-sink indefinitely, it's too hot. Mark Z. |
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