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Old 24th December 2010, 04:38 PM   #21
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The amp is repairable but it would be time consuming. I'd suggest that you reassemble it and return it to its owner.

For drivers, if the through-holes are large enough, I generally use BD139s and BD140s as subs for most all driver transistors in amps that use 2S or KT prefix transistors.
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Old 24th December 2010, 04:53 PM   #22
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Perry,

Im Gonna try to get this amp up and running again since he said he will pay good to have it repaired . I will order new driver transistors for it .


Also since the pads for the driver borad are burnt off the board and i need to make the connections more reliable . whats the best stuff to use to to make better connection on the pins of the driver board to the main board?

I was thinking something like computer ribbon wire and stripping the coating off Or should i use something else?
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Old 24th December 2010, 05:13 PM   #23
luka is offline luka  Slovenia
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owner could send it to DD, he should give them a call and talk with them
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Old 24th December 2010, 05:26 PM   #24
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I generally do something like you see in the attached photos. Scrape the solder mask away on the top of the board and lay a wire (resistor leg or similar) and pass it through a hole that's been drilled in the board near the missing pad. Then form a loop around the through-hole.

A number 60 drill bit is a good size for this.

Make sure that there is no copper on the opposite side of the board where you'll be drilling.

Don't attempt this on boards with more than 2 copper layers unless you confirm that there is no hidden copper where you're going to drill. This can sometimes be done by shining a bright light at the opposite side of the board and confirming that light is passing through the fiberglass where you want to drill.
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Old 24th December 2010, 05:41 PM   #25
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Thanks Perry,

Thats what i was thinking to do also.

Next question is i found 3 out of 8 rectifiers with broken legs on them.
They are FMG36S and FMG36R .

Do you know of a place to get theese from or a good replacement?
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Old 24th December 2010, 05:51 PM   #26
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I know of no source for the 36R. There are likely subs for the positive rectifier but you'll have to find the negative (36R) first.
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