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Brooke Amplifier Problem

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Joebags View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Joebags Quote  Post ReplyReply Direct Link To This Post Topic: Brooke Amplifier Problem
    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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Joebags Quote  Post ReplyReply Direct Link To This Post Posted: 18 December 2013 at 5:30pm
Just put it away. I'll have a look in the morning. I'll let you know.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cravings Quote  Post ReplyReply Direct Link To This Post Posted: 18 December 2013 at 5:12pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Joebags Quote  Post ReplyReply Direct Link To This Post Posted: 18 December 2013 at 4:24pm
Just got an email back there. The amp has been discontinued for 4 years and they don't carry spares.Unhappy
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Joebags Quote  Post ReplyReply Direct Link To This Post Posted: 18 December 2013 at 4:22pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote cravings Quote  Post ReplyReply Direct Link To This Post Posted: 18 December 2013 at 3:12pm
yeah. that's what i was thinking.. but i thought that would be fairly unusual..
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Joebags Quote  Post ReplyReply Direct Link To This Post Posted: 18 December 2013 at 1:16pm
Smile 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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Post Options Post Options   Thanks (0) Thanks(0)   Quote kanks Quote  Post ReplyReply Direct Link To This Post Posted: 24 October 2013 at 5:43pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote cravings Quote  Post ReplyReply Direct Link To This Post Posted: 24 October 2013 at 4:56pm
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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Post Options Post Options   Thanks (1) Thanks(1)   Quote kanks Quote  Post ReplyReply Direct Link To This Post Posted: 24 October 2013 at 4:47pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tan-2 Quote  Post ReplyReply Direct Link To This Post Posted: 24 October 2013 at 8:58am
Yes, it's sparked a second topic about these amplifiers.. Still we need to fill the wallet up!

Logic will get you from A to B. Imagination will take you everywhere.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JayeJSAV Quote  Post ReplyReply Direct Link To This Post Posted: 24 October 2013 at 1:19am
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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