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Old 16th April 2013, 06:56 PM   #21
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by sakis View Post
Hei Mooly just noticed your signature ....i begin to like you more and more every day
I get a bit of stick over it when I start playing with Spice files on here
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Old 17th April 2013, 01:41 PM   #22
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Appreciate all the replies!!
I removed the output transistors and they check OK. I reinstalled them thinking well maybe there was a bad connection between them and the board. Problem still exist. But what I did notice was that when I tap the output board while playing the receiver, there is a crackling noise each time I tap. Bad solder joint somewhere or bad component?
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Old 17th April 2013, 02:08 PM   #23
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Could be either...

Worth resoldering the pcb but its always nice to find the fault. Have you measured the quiescent current yet as mentioned earlier. The secret is to try and find "ways into" problems and measurement is the only way to do that.
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Old 17th April 2013, 03:42 PM   #24
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Basically getting same current reading on both channels arcoss .5 resistor.
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Old 17th April 2013, 03:51 PM   #25
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'tis a strange problem for sure. Well I think your next line of attack has to be to see why it crackles when you tap the board. I'm assuming you haven't a scope, which would really be the correct approach as you could see what was going on.

Also as a whacky thought, is the speaker OK. If it were measuring low impedance it could give these symptoms although not of course the physical issue with the pcb. Had to ask
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Old 17th April 2013, 06:18 PM   #26
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Whilst considering solder joints and components etc. how are the power, ground and output connections to the board? Some old amplifiers used a variety of systems from a thru-hole solder joint like any component, to inserted pins and wire-wrap posts and these can become loose and just as faulty as any loose connection. 'worth a look anyway.
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Old 17th April 2013, 07:10 PM   #27
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FIXED!!

It turns out that there was a small section by one of the driver transistors that had lifted up slightly from the board and not making good contact. I found it while probing with my test lead. This was causing the crackling sound when tapping the board and the original problem. Thanks to everyone for their input!!!
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Old 18th April 2013, 01:17 AM   #28
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Great! - but don't forget to replace the old electrolytic caps, particulary increase the size of the outputs caps as previously posted.
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Old 18th April 2013, 06:25 AM   #29
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An old fashioned sort of fault
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