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C-Audio Pulse P1100 Pulse Transformer

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ceharden View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ceharden Quote  Post ReplyReply Direct Link To This Post Posted: 15 September 2017 at 6:36pm
Excellent, looking good.

Looking at the wirewound resistors top right, do you replace the original thick film soft start with wirewound?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote simonp1100 Quote  Post ReplyReply Direct Link To This Post Posted: 15 September 2017 at 6:46pm
No, the wirewound resistors are for the supply for the SG3525 (VAUX), had a few of these that were open circuit in a few older repairs of these amps. The ceramic ones for the soft-start can be replaced with a NTC but i am sure the 20R ones that are fitted are no longer available.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ceharden Quote  Post ReplyReply Direct Link To This Post Posted: 15 September 2017 at 9:23pm
Ah yes ok.  Don't think I've ever seen one fail which is why I didn't think of it.

Not tried to buy any of the thick film ceramic resistors for a while but then again I've been somewhat dormant in the Pulse repair business for the last couple of years.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote simonp1100 Quote  Post ReplyReply Direct Link To This Post Posted: 15 September 2017 at 10:00pm
The VAUX resistor/ zener circuit has blown a couple of times on some of the older generation C-Audio ones and these resistors were later updated on the XS series to 27K 2 Watt. Looking at Farnell, they do make the 20R value but are out of stock at present. Last time i tried to get them they said they were discontinued but that was a while ago.
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