SOURCE: EFFECTS LOOP NOT SURE.
The send jack on your amp should be connected to the input jack on your pedal and the return jack on your amp should be connected to the output jack on your pedal. Read the manuals for both the pedal and the amp. If you don't have them you can usually find them on the websites of the manufacturers. Make sure your levels on the amp and the pedal are turned down when you plug them in.
SOURCE: The pre amp out and
No, when you plug into the power amp in that disconnects the feed-through of the preamp.
SOURCE: I have a Gallien Krueger Backline 600 head rigged
i) If the crackle is there with all input signal cables removed, then likely to be the head.
ii) Does the crackle vary noisily with control settings? If so, move noisy control to & fro about 10 times to wipe any dirt from internals (temporary solution).
iii) If ii) is not a problem, then tap head casing to check whether a dry solder joint or poor internal connection is the cause. Was unit dropped?
iv) If none of the above, then suspect possible component breakdown.
SOURCE: i tried to plug in a digitech bp200 pedal and then
DO NOT try a guitar pedal as an effects insert via the back jacks... they are for an external line level EQ/Effects type unit. Your guitar pedal should NOT have caused any damage. Check the power adapter you are using with the BP200. The BP200 takes a 9 VAC adapter, NOT a 9VDC type common to most pedals. You cannot use one of the Pedal Train type supplies with the BP200. Also check that you have the in's and out's correct on the pedal... backwards and they will cause what you are observing.. Verify your cables are good. The output of the pedal goes in the FRONT jacks of the amp. ONLY line level drives go to the back jacks.
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