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Did you match the components from one channel to another before assembly? I tested all of my resistors and tried to match each channel as closely as possible. Mine match up very well. Also, have you swapped the turntable cables to see if it is the table? When I first got mine connected, it was off balance. It ended up being dirty contacts on the cartridge pins.
Hello again, I finally found some time where I could get into the bugel 2 again. First of all I did some modifications while I had it out. For practical purposes I decided it would be handier if the inputs and outputs were on the same side so I rehoused it. (It's a shame as I really liked the transparent case). I added a on off switch as well, I found it a bit awkward to have to power it off by pulling out the jack, the wall sockets where it is plugged in is not easily accessible. And finally i added the opamps as suggested by Salis audio at the top of the page.When I connected it back up again one of the chanels is now silent. I switched the cables to make sure.I really have little or no experience with electronics just a simplistic understanding of how some stuff works, so I did some readings with a multimetre to check resistance. I found variations between each side but I am not able to follow the circuit well enough to isolate the issue. So initially with the mulitmetre set to 200k I just tested from each input to each out put and I found a difference of approximately 11. In order to narrow down where the problem lies can some one tell me the best place to test next.I have the idea, may be mistaken, that if I can find the mid way point of the circuit I can test again and find out which half the problem is, find the mid way point of that section and test again, each time narrowing down the area where the problem mat be until I find it. The image posted above shows where the initial readings were taken. Thanks for reading and any help would be appreciated.Niall.
I do not know how the parts in Buggle have been numbered, in the manual there is only one channel shown. I hope the asterisks after the parts indexes are for L or R suffix in the schematic, so...I'd start with checking if you have soldered the opamps correctly. Check twice, three times - as many times as need to be absolutely sure they are correctly soldered.Then power on the device, turn the volume at a slightly less than normal listening level and touch with a thin screwdriver or something metallic the following points in both channels (you should touch the metal part of the thing):1. The output RCA's center pins.2. R12*.3. R7*.4. R1*.You should have rather loud hum from all the 8 points. The problem is between the point where the hum is not comparable to the working channel and the previous test point.
The RCA center pin left and right - no hum (did you mean the input RCA?)
R12 (left) mild hum R12 (r) hum
Out put center - R12 (l) 50.6 Output center - R12 (r) 60.7
At one stage during testing the left speaker also went off, but I powered off and back on the Bugle and it came on again.
I mentioned output RCAs, but I guess you touched the output RCAs in this test. It seems strange for me there is no hum at either points, but lets think it is OK.The difference starts here. It may be U4 or something else around it or even some solder bridge earlier in the circuit. Taking into account the following reading (I hope you do that when the Bugle was switched off and everything disconnected from the output):it seems there is some difference (around 10k) in the last stage. Could you check (measure) the following resistances in both channels: R13, R14, R15 and across the output RCAs?Just for "not walk twice" on the same circuit could you make one more test: put a short wire between R12s in both cannels (one end on the left channel, the other - on the right) and listen of the outcome? Be very careful not to short out some other circuits.Could you elaborate more about the incident?
I'm glad I was able to help you with the problem. I must say that you were very active and give much information. It always helps!
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