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#1
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Bose receiver broken and need alternate.
Bose receiver broken and need replacement or knowledge or a
recommendation. I have a very old Bose DEMC-2-B receiver that has stopped working. Judging by the size of the traces on the printed circuit board it is early 1980's technology and I am looking for a replacement. The basic setup is three rooms with two Bose 102 ceiling mounted speakers and remote volume in each room. The best that I can tell there are three amplifiers in the receiver along with an AM/FM radio. Other rooms are connected but they have independent amplifiers and work properly when connected to another source for testing. The most knowledgeable local audio store person that could be found advised that Bose was different and suggested only a Bose receiver could drive the speakers. Somehow the ‘only Bose' comment did not test for reasonableness. The system is in a home purchased three years ago. The receiver has been removed and the hole in the wall is being repaired. The wiring is accessible to the new receiver location with only minor changes. Since the unit is broken additional features are not the primary consideration. Also there is no interest in replacing the speakers, which sound fine for my purposes. Hopefully the receiver can be replaced with current technology without replacing speakers or rewiring the house. I am simply trying to solve the ‘it's broken problem'. Thanks in advance for any insight that can be offered. Bill Stanley |
#2
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Bose receiver broken and need alternate.
Sounds like perhaps the easiest thing would be to repair the receiver.
What's it doing wrong? Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Bill S." wrote in message m... Bose receiver broken and need replacement or knowledge or a recommendation. I have a very old Bose DEMC-2-B receiver that has stopped working. Judging by the size of the traces on the printed circuit board it is early 1980's technology and I am looking for a replacement. The basic setup is three rooms with two Bose 102 ceiling mounted speakers and remote volume in each room. The best that I can tell there are three amplifiers in the receiver along with an AM/FM radio. Other rooms are connected but they have independent amplifiers and work properly when connected to another source for testing. The most knowledgeable local audio store person that could be found advised that Bose was different and suggested only a Bose receiver could drive the speakers. Somehow the 'only Bose' comment did not test for reasonableness. The system is in a home purchased three years ago. The receiver has been removed and the hole in the wall is being repaired. The wiring is accessible to the new receiver location with only minor changes. Since the unit is broken additional features are not the primary consideration. Also there is no interest in replacing the speakers, which sound fine for my purposes. Hopefully the receiver can be replaced with current technology without replacing speakers or rewiring the house. I am simply trying to solve the 'it's broken problem'. Thanks in advance for any insight that can be offered. Bill Stanley |
#3
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Bose receiver broken and need alternate.
"Mark D. Zacharias" wrote in message ...
Sounds like perhaps the easiest thing would be to repair the receiver. What's it doing wrong? Mark Z. Mark, the volume in one room is wide open and the line out for the independent amplifiers was driving only one channel properly. The project was initially started to verify that the in wall wiring was not the source of the problem. Along the way I realized the circuit boards traces resemble an Apple II. Almost no one repairs other types of electronic gear anymore. And with electronic technology racing along at light speed it seemed prudent and maybe cost effective to replace the receiver with newer more modern receiver. Additionally the receiver had been repaired shortly before I moved and also exchanged about a year and a half later. Replacing the receiver seemed to be the most logical approach. Thanks. Bill Stanley -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Bill S." wrote in message m... Bose receiver broken and need replacement or knowledge or a recommendation. I have a very old Bose DEMC-2-B receiver that has stopped working. Judging by the size of the traces on the printed circuit board it is early 1980's technology and I am looking for a replacement. The basic setup is three rooms with two Bose 102 ceiling mounted speakers and remote volume in each room. The best that I can tell there are three amplifiers in the receiver along with an AM/FM radio. Other rooms are connected but they have independent amplifiers and work properly when connected to another source for testing. The most knowledgeable local audio store person that could be found advised that Bose was different and suggested only a Bose receiver could drive the speakers. Somehow the 'only Bose' comment did not test for reasonableness. The system is in a home purchased three years ago. The receiver has been removed and the hole in the wall is being repaired. The wiring is accessible to the new receiver location with only minor changes. Since the unit is broken additional features are not the primary consideration. Also there is no interest in replacing the speakers, which sound fine for my purposes. Hopefully the receiver can be replaced with current technology without replacing speakers or rewiring the house. I am simply trying to solve the 'it's broken problem'. Thanks in advance for any insight that can be offered. Bill Stanley |
#4
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Bose receiver broken and need alternate.
Well, I know Bose equipment can be quite unconventional, so anything I say
may not apply, but in general: Volume full blast would usually be caused by a lifted ground or a defective volume control, sometimes bad solder connections. Not quite sure what you mean by not driving an amp properly. I assume you've checked the amp and it's OK? Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Bill S." wrote in message om... "Mark D. Zacharias" wrote in message ... Sounds like perhaps the easiest thing would be to repair the receiver. What's it doing wrong? Mark Z. Mark, the volume in one room is wide open and the line out for the independent amplifiers was driving only one channel properly. The project was initially started to verify that the in wall wiring was not the source of the problem. Along the way I realized the circuit boards traces resemble an Apple II. Almost no one repairs other types of electronic gear anymore. And with electronic technology racing along at light speed it seemed prudent and maybe cost effective to replace the receiver with newer more modern receiver. Additionally the receiver had been repaired shortly before I moved and also exchanged about a year and a half later. Replacing the receiver seemed to be the most logical approach. Thanks. Bill Stanley -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Bill S." wrote in message m... Bose receiver broken and need replacement or knowledge or a recommendation. I have a very old Bose DEMC-2-B receiver that has stopped working. Judging by the size of the traces on the printed circuit board it is early 1980's technology and I am looking for a replacement. The basic setup is three rooms with two Bose 102 ceiling mounted speakers and remote volume in each room. The best that I can tell there are three amplifiers in the receiver along with an AM/FM radio. Other rooms are connected but they have independent amplifiers and work properly when connected to another source for testing. The most knowledgeable local audio store person that could be found advised that Bose was different and suggested only a Bose receiver could drive the speakers. Somehow the 'only Bose' comment did not test for reasonableness. The system is in a home purchased three years ago. The receiver has been removed and the hole in the wall is being repaired. The wiring is accessible to the new receiver location with only minor changes. Since the unit is broken additional features are not the primary consideration. Also there is no interest in replacing the speakers, which sound fine for my purposes. Hopefully the receiver can be replaced with current technology without replacing speakers or rewiring the house. I am simply trying to solve the 'it's broken problem'. Thanks in advance for any insight that can be offered. Bill Stanley |
#5
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Bose receiver broken and need alternate.
"Mark D. Zacharias" wrote in message ...
Well, I know Bose equipment can be quite unconventional, so anything I say may not apply, but in general: Volume full blast would usually be caused by a lifted ground or a defective volume control, sometimes bad solder connections. Well the volume control was checked first since the initial suspicion was a wall-wiring problem. The receiver was disconnected and resistance was measured both at the control and at the receiver without finding anything unusual. Three to four ohms on low volume and 10 to 12 k ohms on high volume as I remember. Much later I borrowed a receiver from my son and connected each room individually and the volume control was OK in the offending room and the other rooms. Not quite sure what you mean by not driving an amp properly. I assume you've checked the amp and it's OK? Originally the right channel had developed a lot of static. Disconnecting the right channel line out to the amplifiers stopped the static. Later I disconnected both channels from the receiver and connected the line out of small Sony CD player and the sound was normal. Pardon my general lack of audio knowledge but it has taken several months to arrive at the current level of understanding. I missed having an audio system earlier in life and this is my first real system. Although I started out looking for a more modern replacement your comments have suggested close look at the amplifier circuit board. After looking closely at the traces in the amplifier circuit there are no apparent signs of lifted traces of overheating of any kind. However I am sort of flying blind. Thanks again for your help. Bill Stanley Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Bill S." wrote in message om... "Mark D. Zacharias" wrote in message ... Sounds like perhaps the easiest thing would be to repair the receiver. What's it doing wrong? Mark Z. Mark, the volume in one room is wide open and the line out for the independent amplifiers was driving only one channel properly. The project was initially started to verify that the in wall wiring was not the source of the problem. Along the way I realized the circuit boards traces resemble an Apple II. Almost no one repairs other types of electronic gear anymore. And with electronic technology racing along at light speed it seemed prudent and maybe cost effective to replace the receiver with newer more modern receiver. Additionally the receiver had been repaired shortly before I moved and also exchanged about a year and a half later. Replacing the receiver seemed to be the most logical approach. Thanks. Bill Stanley -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Bill S." wrote in message m... Bose receiver broken and need replacement or knowledge or a recommendation. I have a very old Bose DEMC-2-B receiver that has stopped working. Judging by the size of the traces on the printed circuit board it is early 1980's technology and I am looking for a replacement. The basic setup is three rooms with two Bose 102 ceiling mounted speakers and remote volume in each room. The best that I can tell there are three amplifiers in the receiver along with an AM/FM radio. Other rooms are connected but they have independent amplifiers and work properly when connected to another source for testing. The most knowledgeable local audio store person that could be found advised that Bose was different and suggested only a Bose receiver could drive the speakers. Somehow the 'only Bose' comment did not test for reasonableness. The system is in a home purchased three years ago. The receiver has been removed and the hole in the wall is being repaired. The wiring is accessible to the new receiver location with only minor changes. Since the unit is broken additional features are not the primary consideration. Also there is no interest in replacing the speakers, which sound fine for my purposes. Hopefully the receiver can be replaced with current technology without replacing speakers or rewiring the house. I am simply trying to solve the 'it's broken problem'. Thanks in advance for any insight that can be offered. Bill Stanley |
#6
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Bose receiver broken and need alternate.
Have you tried contacting Bose for service? They have a professional
products group. Your product may be of that line. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Bill S." wrote in message om... "Mark D. Zacharias" wrote in message ... Well, I know Bose equipment can be quite unconventional, so anything I say may not apply, but in general: Volume full blast would usually be caused by a lifted ground or a defective volume control, sometimes bad solder connections. Well the volume control was checked first since the initial suspicion was a wall-wiring problem. The receiver was disconnected and resistance was measured both at the control and at the receiver without finding anything unusual. Three to four ohms on low volume and 10 to 12 k ohms on high volume as I remember. Much later I borrowed a receiver from my son and connected each room individually and the volume control was OK in the offending room and the other rooms. Not quite sure what you mean by not driving an amp properly. I assume you've checked the amp and it's OK? Originally the right channel had developed a lot of static. Disconnecting the right channel line out to the amplifiers stopped the static. Later I disconnected both channels from the receiver and connected the line out of small Sony CD player and the sound was normal. Pardon my general lack of audio knowledge but it has taken several months to arrive at the current level of understanding. I missed having an audio system earlier in life and this is my first real system. Although I started out looking for a more modern replacement your comments have suggested close look at the amplifier circuit board. After looking closely at the traces in the amplifier circuit there are no apparent signs of lifted traces of overheating of any kind. However I am sort of flying blind. Thanks again for your help. Bill Stanley Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Bill S." wrote in message om... "Mark D. Zacharias" wrote in message ... Sounds like perhaps the easiest thing would be to repair the receiver. What's it doing wrong? Mark Z. Mark, the volume in one room is wide open and the line out for the independent amplifiers was driving only one channel properly. The project was initially started to verify that the in wall wiring was not the source of the problem. Along the way I realized the circuit boards traces resemble an Apple II. Almost no one repairs other types of electronic gear anymore. And with electronic technology racing along at light speed it seemed prudent and maybe cost effective to replace the receiver with newer more modern receiver. Additionally the receiver had been repaired shortly before I moved and also exchanged about a year and a half later. Replacing the receiver seemed to be the most logical approach. Thanks. Bill Stanley -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Bill S." wrote in message m... Bose receiver broken and need replacement or knowledge or a recommendation. I have a very old Bose DEMC-2-B receiver that has stopped working. Judging by the size of the traces on the printed circuit board it is early 1980's technology and I am looking for a replacement. The basic setup is three rooms with two Bose 102 ceiling mounted speakers and remote volume in each room. The best that I can tell there are three amplifiers in the receiver along with an AM/FM radio. Other rooms are connected but they have independent amplifiers and work properly when connected to another source for testing. The most knowledgeable local audio store person that could be found advised that Bose was different and suggested only a Bose receiver could drive the speakers. Somehow the 'only Bose' comment did not test for reasonableness. The system is in a home purchased three years ago. The receiver has been removed and the hole in the wall is being repaired. The wiring is accessible to the new receiver location with only minor changes. Since the unit is broken additional features are not the primary consideration. Also there is no interest in replacing the speakers, which sound fine for my purposes. Hopefully the receiver can be replaced with current technology without replacing speakers or rewiring the house. I am simply trying to solve the 'it's broken problem'. Thanks in advance for any insight that can be offered. Bill Stanley |
#7
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Bose receiver broken and need alternate.
"Mark D. Zacharias" wrote in message ...
Have you tried contacting Bose for service? They have a professional products group. Your product may be of that line. Mark Z. Mark. Well I spoke at length with three very polite and knowledgeable people at Bose. Below is a summary of the information resulting from the conversations. It appears that the Bose DEMC-2-B receiver was manufactured starting in 1988 and discontinued sometime around 1992/1993. The Bose 102 speakers are low impedance speakers and were referred to as 1.2 ohm impedance speakers. Current speakers are either 4 or 8 ohms and are not compatible. Current receivers manufactured by Bose are not compatible with past 1.2 ohm speakers. The receiver has three amplifiers. Volume control in the receiver is by Voltage Controlled Amplifiers. Turing the volume pot up turns the voltage up to the amplifier and volume is louder. An open circuit to the volume control will cause the amplifier to drive at full volume. The volume control is by a 10 k. variable resister. The bottom line is that there are no replacement receivers. Replacing the receiver would also require replacing the speakers. The information above is stated for clarity. Likely the information is not news to you. The good news is that Bose is sending a schematic. Your suggestions, which implied repairing the system, are turning out to be very astute. Thank you. Bill Stanley -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Bill S." wrote in message om... "Mark D. Zacharias" wrote in message ... Well, I know Bose equipment can be quite unconventional, so anything I say may not apply, but in general: Volume full blast would usually be caused by a lifted ground or a defective volume control, sometimes bad solder connections. Well the volume control was checked first since the initial suspicion was a wall-wiring problem. The receiver was disconnected and resistance was measured both at the control and at the receiver without finding anything unusual. Three to four ohms on low volume and 10 to 12 k ohms on high volume as I remember. Much later I borrowed a receiver from my son and connected each room individually and the volume control was OK in the offending room and the other rooms. Not quite sure what you mean by not driving an amp properly. I assume you've checked the amp and it's OK? Originally the right channel had developed a lot of static. Disconnecting the right channel line out to the amplifiers stopped the static. Later I disconnected both channels from the receiver and connected the line out of small Sony CD player and the sound was normal. Pardon my general lack of audio knowledge but it has taken several months to arrive at the current level of understanding. I missed having an audio system earlier in life and this is my first real system. Although I started out looking for a more modern replacement your comments have suggested close look at the amplifier circuit board. After looking closely at the traces in the amplifier circuit there are no apparent signs of lifted traces of overheating of any kind. However I am sort of flying blind. Thanks again for your help. Bill Stanley Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Bill S." wrote in message om... "Mark D. Zacharias" wrote in message ... Sounds like perhaps the easiest thing would be to repair the receiver. What's it doing wrong? Mark Z. Mark, the volume in one room is wide open and the line out for the independent amplifiers was driving only one channel properly. The project was initially started to verify that the in wall wiring was not the source of the problem. Along the way I realized the circuit boards traces resemble an Apple II. Almost no one repairs other types of electronic gear anymore. And with electronic technology racing along at light speed it seemed prudent and maybe cost effective to replace the receiver with newer more modern receiver. Additionally the receiver had been repaired shortly before I moved and also exchanged about a year and a half later. Replacing the receiver seemed to be the most logical approach. Thanks. Bill Stanley -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Bill S." wrote in message m... Bose receiver broken and need replacement or knowledge or a recommendation. I have a very old Bose DEMC-2-B receiver that has stopped working. Judging by the size of the traces on the printed circuit board it is early 1980's technology and I am looking for a replacement. The basic setup is three rooms with two Bose 102 ceiling mounted speakers and remote volume in each room. The best that I can tell there are three amplifiers in the receiver along with an AM/FM radio. Other rooms are connected but they have independent amplifiers and work properly when connected to another source for testing. The most knowledgeable local audio store person that could be found advised that Bose was different and suggested only a Bose receiver could drive the speakers. Somehow the 'only Bose' comment did not test for reasonableness. The system is in a home purchased three years ago. The receiver has been removed and the hole in the wall is being repaired. The wiring is accessible to the new receiver location with only minor changes. Since the unit is broken additional features are not the primary consideration. Also there is no interest in replacing the speakers, which sound fine for my purposes. Hopefully the receiver can be replaced with current technology without replacing speakers or rewiring the house. I am simply trying to solve the 'it's broken problem'. Thanks in advance for any insight that can be offered. Bill Stanley |
#8
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Bose receiver broken and need alternate.
Well, I hope that works out for you. Obviously I was correct that your
system was one of Bose' unconventional types. Clearly the one channel that's way too loud has a DC problem affected the voltage-conrolled amp. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Bill S." wrote in message om... "Mark D. Zacharias" wrote in message ... Have you tried contacting Bose for service? They have a professional products group. Your product may be of that line. Mark Z. Mark. Well I spoke at length with three very polite and knowledgeable people at Bose. Below is a summary of the information resulting from the conversations. It appears that the Bose DEMC-2-B receiver was manufactured starting in 1988 and discontinued sometime around 1992/1993. The Bose 102 speakers are low impedance speakers and were referred to as 1.2 ohm impedance speakers. Current speakers are either 4 or 8 ohms and are not compatible. Current receivers manufactured by Bose are not compatible with past 1.2 ohm speakers. The receiver has three amplifiers. Volume control in the receiver is by Voltage Controlled Amplifiers. Turing the volume pot up turns the voltage up to the amplifier and volume is louder. An open circuit to the volume control will cause the amplifier to drive at full volume. The volume control is by a 10 k. variable resister. The bottom line is that there are no replacement receivers. Replacing the receiver would also require replacing the speakers. The information above is stated for clarity. Likely the information is not news to you. The good news is that Bose is sending a schematic. Your suggestions, which implied repairing the system, are turning out to be very astute. Thank you. Bill Stanley -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Bill S." wrote in message om... "Mark D. Zacharias" wrote in message ... Well, I know Bose equipment can be quite unconventional, so anything I say may not apply, but in general: Volume full blast would usually be caused by a lifted ground or a defective volume control, sometimes bad solder connections. Well the volume control was checked first since the initial suspicion was a wall-wiring problem. The receiver was disconnected and resistance was measured both at the control and at the receiver without finding anything unusual. Three to four ohms on low volume and 10 to 12 k ohms on high volume as I remember. Much later I borrowed a receiver from my son and connected each room individually and the volume control was OK in the offending room and the other rooms. Not quite sure what you mean by not driving an amp properly. I assume you've checked the amp and it's OK? Originally the right channel had developed a lot of static. Disconnecting the right channel line out to the amplifiers stopped the static. Later I disconnected both channels from the receiver and connected the line out of small Sony CD player and the sound was normal. Pardon my general lack of audio knowledge but it has taken several months to arrive at the current level of understanding. I missed having an audio system earlier in life and this is my first real system. Although I started out looking for a more modern replacement your comments have suggested close look at the amplifier circuit board. After looking closely at the traces in the amplifier circuit there are no apparent signs of lifted traces of overheating of any kind. However I am sort of flying blind. Thanks again for your help. Bill Stanley Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Bill S." wrote in message om... "Mark D. Zacharias" wrote in message ... Sounds like perhaps the easiest thing would be to repair the receiver. What's it doing wrong? Mark Z. Mark, the volume in one room is wide open and the line out for the independent amplifiers was driving only one channel properly. The project was initially started to verify that the in wall wiring was not the source of the problem. Along the way I realized the circuit boards traces resemble an Apple II. Almost no one repairs other types of electronic gear anymore. And with electronic technology racing along at light speed it seemed prudent and maybe cost effective to replace the receiver with newer more modern receiver. Additionally the receiver had been repaired shortly before I moved and also exchanged about a year and a half later. Replacing the receiver seemed to be the most logical approach. Thanks. Bill Stanley -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Bill S." wrote in message m... Bose receiver broken and need replacement or knowledge or a recommendation. I have a very old Bose DEMC-2-B receiver that has stopped working. Judging by the size of the traces on the printed circuit board it is early 1980's technology and I am looking for a replacement. The basic setup is three rooms with two Bose 102 ceiling mounted speakers and remote volume in each room. The best that I can tell there are three amplifiers in the receiver along with an AM/FM radio. Other rooms are connected but they have independent amplifiers and work properly when connected to another source for testing. The most knowledgeable local audio store person that could be found advised that Bose was different and suggested only a Bose receiver could drive the speakers. Somehow the 'only Bose' comment did not test for reasonableness. The system is in a home purchased three years ago. The receiver has been removed and the hole in the wall is being repaired. The wiring is accessible to the new receiver location with only minor changes. Since the unit is broken additional features are not the primary consideration. Also there is no interest in replacing the speakers, which sound fine for my purposes. Hopefully the receiver can be replaced with current technology without replacing speakers or rewiring the house. I am simply trying to solve the 'it's broken problem'. Thanks in advance for any insight that can be offered. Bill Stanley |