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Old 16th April 2005, 07:40 AM   #1
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Question Help! Failed BASH amp in Tannoy i6

I have a Tannoy i6 powered speaker that distorts badly once gain or input signal goes above a whisper. The amp in the enclosure is an Indigo BASH with 2 channels (high & low freq.)

I see a high-freq (switching-freq?) signal at both channel outputs for half of a 60Hz cycle even with no input to amp, so I suspect the power supply. When I look at the PS output, I see the spikes shown in the diagram at the switching frequency (I think). Any ideas twhat to look at/for? I suspect the PS caps, mainly because Tannoy's newer models have fins on the amp plates and these older ones don't, so electrolytics may have deteriorated faster??

Any better ideas? Anyone with BASH experience?
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Old 16th April 2005, 09:03 AM   #2
wytco0 is offline wytco0  United Kingdom
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might be worth trying the class d forum ?
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Old 16th April 2005, 07:52 PM   #3
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Hmmm, I looked over in D before I posted here, and they're all talking about using UcD and SI module amps... anyway, Indigo claims BASH isn't really Class D.

I don't care what it's called (well - a little.. ;^)) I need a tip on fixing it!
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Old 17th April 2005, 07:12 AM   #4
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Indigo might claims BASH isn't Class D, a number of Class D makers call, themselves something different, bur basically are Class D. If the Class D forum canít help, is it still under warranty; or the dealer?
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Old 17th April 2005, 03:54 PM   #5
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Off warranty.

Tannoy is trying to help. If they figure it out first, then I'll post what we find. Does the ripple in the power supply voltage (see above) look strange to anyone or is this normal?
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