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Old 20th January 2009, 10:47 PM   #1
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Default Gale storm 8

Bought this secondhand, mainly for the electronics. Consists of an average, standard 8inch woofer, mounted in a thin walled, 12inch cube enclousure. Relfex loading, with little internal dampening. However, I was surprised with the measurments I recorded (see attached).

Is this what one would expect to see from a cheapo small sub?
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File Type: jpg gale subwoofer.jpg (60.2 KB, 350 views)
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Old 20th January 2009, 11:58 PM   #2
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Expect? Hard to say, but it seems reasonable to me since I use to build similar size box volume (Vb) speakers with cheap RS drivers with similar results when I used T/S max flat alignments.

GM
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Old 18th March 2011, 08:53 PM   #3
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My Gale 8 produces an on-going rumble. I have changed all the radial caps and will change the TDA7375 integrated amp if necessary. Does anyone have the Cct Diag?
Micorina
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Old 18th March 2011, 09:00 PM   #4
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My Gale Storm 8 Sub is in trouble. It has an on-going loud rumble when switched on. I have changed all the radial caps and am possibly going to change the TDA7375 int. amp. Does anyone have the Cct. Diagram?
Micorina
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Old 21st March 2011, 07:53 PM   #5
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I have now changed the int. amp. TDA7375 but there is no change - the 'continuous rumble is still there. There are two pcb and two other chips but sourcing replacements of these chips is proving difficult. One is: 45580 / JRC / 40174 the other is: TLO84CN / GK5141J6 / STo3V6GKCHN - that is what is printed on the back of the chips. Anyone have any ideas as to where these chips can be bought?
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Old 24th March 2011, 05:03 PM   #6
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I am now in the process of changing all the smaller caps. There is also a Zener Diode in there which I have changed but the on-going rumble is still there. It seems Maplins do not stock any caps with 82 in the value and I need an 823K 100v. cap (=0.082uf - or - 82,000pf) Any ideas out there. In fact has anyone read these posts of mine and are willing to input ideas?
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Old 24th March 2011, 08:15 PM   #7
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We have a Eureka! moment! Having methodically changed all the radial caps, the Zener Diode and the Integrated amp. TDA7375, I started in on changing the smaller caps - the Mylar and disc type. Between each change of one or two caps I tested for 'rumble'. After changing three 2A104J 100v. Mylar types I tested the Subwoofer again and... that's when the Eureka moment occurred. So, apart from a low mains hum from the Subwoofer - which was always there - we are now back in business. You may congratulate me if you wish...
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Old 24th March 2011, 08:26 PM   #8
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Nice work, it's good to hear of people solving their own problems.

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Old 24th March 2011, 08:41 PM   #9
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Hello Chris661 - thanks for the congrats! I was joking really about saying '...you may congratulate me if you wish...' as there didn't seem to be any response from 'out there'. You say "I'm in a hurry - I need to plug it ion and watch it burn, baby!" Well, that's just what my son's Violin/Guitar amp has just done. It's a KLA10 unit and smoke started pouring out from under the PCB. The Integrated Amp - a TDA2030 - gets mighty hot and started melting the contact paste. But the main problem was the huge hum.m.m which preceded the smoke. At this point we turned it off. After cooling we turned it on again and the hum.m. is still there so we turned it off again before the burning started. Michael
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Old 24th March 2011, 08:59 PM   #10
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Sounds like you've a problem with that amp.

Might be an idea to post something in either the "chip amps" section, or the musical instruments section. Either way, you're likely to find people a little more specialised on the subject.
That particular chip, I've had problems with. Upon opening the little practice amp I'd bought faulty, fixed the problem and found the feedback resistors for the chip were on the main board, the chip being connected via a ribbon cable. This made the whole thing incredibly sensitive to everything. Waving your hand near it caused buzz.
Your problem sounds altogether more serious. I'd suggest first of all putting a fuse on the + and - supplies, so they'll cut the power before anything goes pop again.

Chris
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