This is just an area I can blab on about stuff without it using up bandwidth in the threads 
Hopefully someone will find it interesting or useful.
Tony.
Hopefully someone will find it interesting or useful. Tony.
Had a reasonably productive day today
Posted 5th September 2009 at 02:25 PM by wintermute
Updated 25th November 2009 at 12:07 PM by wintermute (added categories speakers and amps)
Updated 25th November 2009 at 12:07 PM by wintermute (added categories speakers and amps)
Sanded down the second box so it is now in a state that is close to ready for veneering. Filled the screw holes with filler and also the bottom of the front baffle which was for some reason a mm or so short. can't remember if that was a measurement stuff up or a problem with the saw accuracy, probably the former I'd guess! Actually now that I think about it, it was an assumption that the mdf was really 25mm thick and it was slightly more... Only problem is the filler takes 48 hours to dry, so next weekend before I can start trying to slap on any veneer.
Also attacked the amp again. Plan was to put in the bypass of the preamp. Got most of the way there but was getting too late so left the drilling of the back pannel (for the rca sockets) for tomorrow. All in all it was a worthwhile excercise. The way the input caps were installed was nothing short of shocking, I think I did it to check it was ok, but never got around to doing it properly, I decided to use cat5e twisted pair with one end tied to the star ground for the inevitable runs from the switch to the input caps. In the end in some respects it probably has a shorter signal path now for one of the inputs which had long wire links and windy tracks on the board. the two inputs now have almost the same length from the output of the pre/direct connect from the back. The amp doesn't appear to be oscillating (which has been a problem in the past with some similar mods) so I'm guessing it worked ok.
Put it all back together and it still works so that is a positive
Hopefully will have the time to install the rca's tomorrow, and the mythtv box will be able to run direct without any preamp in the way.
Tony.
Also attacked the amp again. Plan was to put in the bypass of the preamp. Got most of the way there but was getting too late so left the drilling of the back pannel (for the rca sockets) for tomorrow. All in all it was a worthwhile excercise. The way the input caps were installed was nothing short of shocking, I think I did it to check it was ok, but never got around to doing it properly, I decided to use cat5e twisted pair with one end tied to the star ground for the inevitable runs from the switch to the input caps. In the end in some respects it probably has a shorter signal path now for one of the inputs which had long wire links and windy tracks on the board. the two inputs now have almost the same length from the output of the pre/direct connect from the back. The amp doesn't appear to be oscillating (which has been a problem in the past with some similar mods) so I'm guessing it worked ok.
Put it all back together and it still works so that is a positive
Hopefully will have the time to install the rca's tomorrow, and the mythtv box will be able to run direct without any preamp in the way. Tony.
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