belgiansound
Member
Hi,
It's the second bose 1800 series 1 in my family. My other one I also took completely apart, added a loudspreaker protection board and replaced the 2 resistors needed to avoid the board from blowing. Did the most necessary stuff on it and plays fine (except for the silent buz it makes, but that's another topic). It has the C transformer
I bought a second one in France recently and would like to do the full monty on this one. it looks like it had a tougher life, it always lived in a rack. The handles on it are completely worn and I don't think I will put them back (my other one also doesn't have handles). First thing i did was screw some feet under it, huge improvement to move around. It also has the slightly older transformator. I had some 'hickups' opening the thing, buttons on the front could not be taken off in a normal way as the screws inside were completely worn. Had to drill them off and scratched the front doing it.
Thermal paste is completely dried out, had to take it off using a razer (more than 1 hour of work...).
Most worrying thing though is the fact that the board left and right are different, one is from a 1801, and even more worrying they have been messing around and changed some transistors... On one board they used the same BOSE serial number but different make, on the other board 2 have been switched to 'unmarked' ones, which troubles me.
Some other components are used as well on both boards (but I plan on replacing most)
There is also a difference between both boards, R5 has been changed on the rev4 and the rev5 has some extra parts on it! Not sure how I can fix it, best thing would be to drill holes and add the pieces on rev4.
One other annoying thing is that one board has a different heat sink, slightly higher, which gives less mounting space.
Some questions:
- should I replace the strange transistors? The one board with the different styles of the bose transistor don't worry me but the 'blank' ones do. It worked fine though.
- If I replace the two blancs, should I replace all transistors on this board?
- Same question, should I also replace all transistors on the other board?
- Should I worry about the small changes on rev5 and do them on rev4? Logic says yes, but just want to be sure
- I plan on changing all resistors and caps (there aren't many) but should I use the values given in the manual or the ones which are mounted on my board? Is there somewhere a comprehensive list, I know there have been quite a few topics on this (and I think I read them all)
- Should I also replace Q1 and U1? both boards use different versions and I guess better updates are available now, or will I loose the typical sound?
- Same questions for the diodes and other stuff which isn't a resistor or capacitor
Thanks!!
(I am trying to add pics, they are on my phone, and 'samsung sync' is testing the extent of my nerves, crappy software. When it works, I will add some)
It's the second bose 1800 series 1 in my family. My other one I also took completely apart, added a loudspreaker protection board and replaced the 2 resistors needed to avoid the board from blowing. Did the most necessary stuff on it and plays fine (except for the silent buz it makes, but that's another topic). It has the C transformer
I bought a second one in France recently and would like to do the full monty on this one. it looks like it had a tougher life, it always lived in a rack. The handles on it are completely worn and I don't think I will put them back (my other one also doesn't have handles). First thing i did was screw some feet under it, huge improvement to move around. It also has the slightly older transformator. I had some 'hickups' opening the thing, buttons on the front could not be taken off in a normal way as the screws inside were completely worn. Had to drill them off and scratched the front doing it.
Thermal paste is completely dried out, had to take it off using a razer (more than 1 hour of work...).
Most worrying thing though is the fact that the board left and right are different, one is from a 1801, and even more worrying they have been messing around and changed some transistors... On one board they used the same BOSE serial number but different make, on the other board 2 have been switched to 'unmarked' ones, which troubles me.
Some other components are used as well on both boards (but I plan on replacing most)
There is also a difference between both boards, R5 has been changed on the rev4 and the rev5 has some extra parts on it! Not sure how I can fix it, best thing would be to drill holes and add the pieces on rev4.
One other annoying thing is that one board has a different heat sink, slightly higher, which gives less mounting space.
Some questions:
- should I replace the strange transistors? The one board with the different styles of the bose transistor don't worry me but the 'blank' ones do. It worked fine though.
- If I replace the two blancs, should I replace all transistors on this board?
- Same question, should I also replace all transistors on the other board?
- Should I worry about the small changes on rev5 and do them on rev4? Logic says yes, but just want to be sure
- I plan on changing all resistors and caps (there aren't many) but should I use the values given in the manual or the ones which are mounted on my board? Is there somewhere a comprehensive list, I know there have been quite a few topics on this (and I think I read them all)
- Should I also replace Q1 and U1? both boards use different versions and I guess better updates are available now, or will I loose the typical sound?
- Same questions for the diodes and other stuff which isn't a resistor or capacitor
Thanks!!
(I am trying to add pics, they are on my phone, and 'samsung sync' is testing the extent of my nerves, crappy software. When it works, I will add some)
