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Old 29th June 2010, 11:01 AM   #1
Boscoe is offline Boscoe  United Kingdom
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Default Velleman amp replacment part query

Basically from anohter thread I was advised to post here and after they helped me diognose the problem I thought it would be better to sak this question in this section. Basically I got THIS amp and it stopped working I'm going to replace the power resistors which I have already ordered but they say that I need to change the transistor BC547B I have a BC547B will this work?

Thanks.
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Old 29th June 2010, 11:55 AM   #2
jaycee is offline jaycee  United Kingdom
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I suspect you meant a BC546B Yes, that will work. What parts failed ?
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Old 29th June 2010, 12:01 PM   #3
Boscoe is offline Boscoe  United Kingdom
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No sorry I meant BC478B, I don't know wether that will work as the values arn't as high as the 547. The power resistors have over heated and burnt and I'm replacing that transitor for goos measure as it was the thing that I think caused it.
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Old 29th June 2010, 12:50 PM   #4
jaycee is offline jaycee  United Kingdom
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Are you talking about the bias device that goes into a hole drilled in the heat sink?
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Old 29th June 2010, 02:54 PM   #5
Boscoe is offline Boscoe  United Kingdom
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Yes I am.
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Old 29th June 2010, 03:04 PM   #6
jaycee is offline jaycee  United Kingdom
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The part you mention isn't suitable. A BC546 will work, and these are readily available - i think Maplin even still stock them!
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Old 29th June 2010, 07:35 PM   #7
Boscoe is offline Boscoe  United Kingdom
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Yeh I did see that and i had a go with the other one i had but to no avail. I will be buying a couple of those from maplin.

Thanks for the help.
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