02-15-2013 09:00 AM
Thank you for the manual, but now it seems like I need to find a service manual to locate the pins I need to jump. Any ideas on that? I've just looked on AB's site and they don't show it at all.
02-15-2013 09:07 AM
Specifically which model of 900, there were several. There should be more to the model number. Most have a bridge toggle switch on the back on the input section. There should be 2 switches, a ground lift and a bridge switch.
There may be some very early ones that did not have this but there are other ways to enable bridge operation IF it's really necessary. Some early ones that did not have the bridge switch also could not drive a 4 ohm bridged load.
What are you trying to drive?
02-15-2013 09:12 AM
Looked at the manual posted, that's the earliest version and can not drive anything but an 8 ohm load in bridge mode.
Parts are no longer available for that amp, if it's running the way it is, I wouldn't mess with it. They are at the end oftheir useful lives. It's probably close to 30 years old.
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