Brooke Amplifier Problem |
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Joebags
Registered User Joined: 01 May 2009 Location: Dublin Status: Offline Points: 51 |
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Posted: 14 January 2014 at 10:59am |
I took some photos here of the transformer wiring.
http://www.flickr.com/photos/33203633@N04/. Primary is Blue(245v) Red(230v) Red (0v) Secondary is Yellow (18v) Black (0v) Yellow (18v) Green (0v) Green (22.5v) Red (92v) White (46v) Black (0v) White (46v) Red (92v) Regards Joe |
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Joebags
Registered User Joined: 01 May 2009 Location: Dublin Status: Offline Points: 51 |
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Just put it away. I'll have a look in the morning. I'll let you know.
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cravings
Old Croc Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7439 |
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it's not a brilliant amp but it has a fair bit of grunt...
they were sold that amp by someone in india who built them a sound system. he gave them a pair of single 18" reflex bins with p-audio something (sd18 maybe) in them, and a pair of double 15" boxes with 2 p-audio sn15b and a fake jbl backplate with random crossover, and a huge 2" p-audio horn with a 1" p-audio pa-26 or something on it.. and the one amp, and just told them to join it all up. i've been giving them a crossover and a second amp though, so mostly that amp has just done the single 18s.. i'm going to see if i can help that system a bit. they don't need anything fancy, but i think losing the passing xover, fitting 2" comps on the horns, and maybe doing a bit with some other passive crossovers i have should make it a bit better... shame about the amp though. how many taps are there off the xtformer? |
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Joebags
Registered User Joined: 01 May 2009 Location: Dublin Status: Offline Points: 51 |
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Just got an email back there. The amp has been discontinued for 4 years and they don't carry spares.
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Joebags
Registered User Joined: 01 May 2009 Location: Dublin Status: Offline Points: 51 |
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Not the most common problem but it does happen. I've emailed Brooke amplifiers to see if they do a replacement. Might be too costly to repair but I'll see if they get back in touch and take it from there.
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cravings
Old Croc Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7439 |
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yeah. that's what i was thinking.. but i thought that would be fairly unusual..
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Joebags
Registered User Joined: 01 May 2009 Location: Dublin Status: Offline Points: 51 |
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Just came across this post now. Yep have it on the bench at the moment.
Seems like the transformer has some shorted windings. I disconnected the output modules and the power supply board and brought the voltage up with a variac and light bulb limiter and she glows like the north star! |
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kanks
Registered User Joined: 26 April 2012 Location: Manchester Status: Offline Points: 259 |
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When I learned it I got an old transformer to test the setup. your bulb (think it works best on the high side winding cant remember) connected to a winding and connect your battery for a sec to the other and release the bulb will flash. now pass a piece of wire around it and connect it to itself to create a shorted turn. Try again now the bulb wont flash as the shorted turn burns up the energy.
And back the the broke brooke Edited by kanks - 24 October 2013 at 5:44pm |
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cravings
Old Croc Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7439 |
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this sounds very useful and i appreciate it and will definitely note that advice for future... but this amp has been boxed up and i'm returning it to its owner right now.
i made no promise to him to repair it, but i was curious to check it out. hopefully someone else can sort it out for him. thanks all. back to the brooke amp now :) |
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kanks
Registered User Joined: 26 April 2012 Location: Manchester Status: Offline Points: 259 |
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Test the transformer by using a neon light bulb and a 9v battery.
You can test for a shorted winding with a neon bulb connected to one winding and a small battery one the another. You connect the battery to a winding and release this causes a kick to be generated at the other windings and will light your neon lamp for a second (just like and ignition coil). If there is a shorted winding the short will consume the generated current and the lamp will remain dead. This needs the transformer out of circuit. Edit to correct a mistake. Edited by kanks - 24 October 2013 at 5:38pm |
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Tan-2
Registered User Joined: 29 April 2011 Location: Glasgow Status: Offline Points: 255 |
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Yes, it's sparked a second topic about these amplifiers.. Still we need to fill the wallet up!
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Logic will get you from A to B. Imagination will take you everywhere.
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JayeJSAV
Registered User Joined: 24 October 2012 Location: Leeds Status: Offline Points: 28 |
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Blimey I was wondering what all the notifications were about. In my case, I've backburnered this now cause I've got making money to do! :( step one. Blown up fire alarm repair!
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