Bush DAC10 Speaker Rattling - UK Vintage Radio Repair and Restoration Discussion Forum

stuart_morgan_64 · 24th Aug 2017, 11:41 am

I have a DAC10 which is basicly working after the usual capacitor change. When I tested all is ok except at higher volumes the speaker rattles, as if there is a faulty speaker. Fitted another, same problem. Remove the whole lot in case of cabinet rattling, still the same.

Any ideas please.

Thanks

Herald1360 · 24th Aug 2017, 11:57 am

Dodgy output transformer or tone correction capacitor?

Can you 'scope the TX primary? Beware of live chassis grounding issues!

stuart_morgan_64 · 24th Aug 2017, 12:18 pm

Cap changed, I have a extension speaker which has a built in selectable output transformer. I will try that now. Yes I can scope the primary. N to live now and isolation tx in use. Thanks for the warnings

stuart_morgan_64 · 24th Aug 2017, 12:39 pm

Changed the tone correction and now ok, it was a new cap too. Thanks for your help.

Tractionist · 24th Aug 2017, 2:00 pm

Happy result! "Measure twice ..... cut once eh"? (Always test any component as and when it's removed and re or newly installed .................).

Herald1360 · 24th Aug 2017, 5:05 pm

Lucky guess......

24th Aug 2017, 11:41 am	#1
stuart_morgan_64 Heptode Join Date: Aug 2004 Location: Woodbridge, Suffolk, UK. Posts: 501	Bush DAC10 Speaker Rattling I have a DAC10 which is basicly working after the usual capacitor change. When I tested all is ok except at higher volumes the speaker rattles, as if there is a faulty speaker. Fitted another, same problem. Remove the whole lot in case of cabinet rattling, still the same. Any ideas please. Thanks

24th Aug 2017, 11:57 am	#2
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,536	Re: Bush DAC10 Speaker Rattling Dodgy output transformer or tone correction capacitor? Can you 'scope the TX primary? Beware of live chassis grounding issues! __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O

24th Aug 2017, 12:18 pm	#3
stuart_morgan_64 Heptode Join Date: Aug 2004 Location: Woodbridge, Suffolk, UK. Posts: 501	Re: Bush DAC10 Speaker Rattling Cap changed, I have a extension speaker which has a built in selectable output transformer. I will try that now. Yes I can scope the primary. N to live now and isolation tx in use. Thanks for the warnings

24th Aug 2017, 12:39 pm	#4
stuart_morgan_64 Heptode Join Date: Aug 2004 Location: Woodbridge, Suffolk, UK. Posts: 501	Re: Bush DAC10 Speaker Rattling Changed the tone correction and now ok, it was a new cap too. Thanks for your help.

24th Aug 2017, 2:00 pm	#5
Tractionist Heptode Join Date: Apr 2016 Location: Cheltenham, Gloucestershire, UK. Posts: 875	Re: Bush DAC10 Speaker Rattling Happy result! "Measure twice ..... cut once eh"? (Always test any component as and when it's removed and re or newly installed .................). __________________ Red to red, black to black. Throw the switch and stand well back!

24th Aug 2017, 5:05 pm	#6
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,536	Re: Bush DAC10 Speaker Rattling Lucky guess...... __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O