Rob Flinn
Well-known member
I've been trying to solve a problem in a Soundcraft 1624 which has a frying right st bus .
The bus feeds a basic 5534 summing amp with 3 resistors an output cap & a 12pf cap. From there it goes to an insert point then the fader, & subsequently the fader buffer.
The problem is around the summing bus or amp since the frying goes when I deck the fader the frying goes. All the channels & tape returns are switched off, which disconnects them from the bus.
What I've done so far, swapped out all the summing amp parts & tarted up all the soldering. exactly the same frying sound. I disconnected the input from the bus to the summing amp & it disappears.
What I'm notunderstanding that the bus is just a piece of wire that is disconnected from everything else, so why do a still get the frying ? Or is it possible that one of the F2 (like the 1176 push switches) switches that switch the channels on & off the bus is puuting some crap on the bus ?/
Any ideas ?
The bus feeds a basic 5534 summing amp with 3 resistors an output cap & a 12pf cap. From there it goes to an insert point then the fader, & subsequently the fader buffer.
The problem is around the summing bus or amp since the frying goes when I deck the fader the frying goes. All the channels & tape returns are switched off, which disconnects them from the bus.
What I've done so far, swapped out all the summing amp parts & tarted up all the soldering. exactly the same frying sound. I disconnected the input from the bus to the summing amp & it disappears.
What I'm notunderstanding that the bus is just a piece of wire that is disconnected from everything else, so why do a still get the frying ? Or is it possible that one of the F2 (like the 1176 push switches) switches that switch the channels on & off the bus is puuting some crap on the bus ?/
Any ideas ?