I have a Alchemist Kraken power amplifier with what looks like a DC relay protection circuit.
There is no output on the binding post. If i mesure the speaker output before the DC circuit i get about 15 volts DC left and right.
There seems to be a repair don i the past (by factory?)
What will be the usual suspects, the PSU?
There is no output on the binding post. If i mesure the speaker output before the DC circuit i get about 15 volts DC left and right.
There seems to be a repair don i the past (by factory?)
What will be the usual suspects, the PSU?
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![IMG_3365[1].JPG](/community/data/attachments/1033/1033784-fdae6aa7fd898550c197ffcd980932e8.jpg?hash=_a5qp_2JhV)
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If the amp has split power supply rails, verify that both rails are equal in magnitude. Or it may be blown the lower transistors in both channel the same way, rare but may be possible.
Will look in it tonight. Thanks. Thats sounds logical, but rare indeed.
Yes, same fault in both chanels is rare but may occur. Search for a blown fuse in the DC path, perhaps an overload or a transient may cause it to act.
But while searching a fault, always use a current limited AC supply: get a bulb of 2 to 3 times the amp power capability, filament type (no led nor ccfl nor fluoro) with its proper socket and a metre of cables. Thus, remove the mains fuse and wire the lamp as it would be the fuse. Under normal condition, when switching it on, lamp will flash shortly when reservoir caps are charging and the flux in the trafo stablishes. After it, lamp mustn't glow at all or the filament must be dark red. If during tests without load; lamps increases bright, it limits the damage and alerts you something is going bad. Never do tests with good speakers, use some that can be discarded; or better, fixed resistors of proper values, both resistance and power. Use several of them to reach power handling if needed.
But while searching a fault, always use a current limited AC supply: get a bulb of 2 to 3 times the amp power capability, filament type (no led nor ccfl nor fluoro) with its proper socket and a metre of cables. Thus, remove the mains fuse and wire the lamp as it would be the fuse. Under normal condition, when switching it on, lamp will flash shortly when reservoir caps are charging and the flux in the trafo stablishes. After it, lamp mustn't glow at all or the filament must be dark red. If during tests without load; lamps increases bright, it limits the damage and alerts you something is going bad. Never do tests with good speakers, use some that can be discarded; or better, fixed resistors of proper values, both resistance and power. Use several of them to reach power handling if needed.
