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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
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19th Nov 2018, 9:57 am | #1 |
Triode
Join Date: Apr 2012
Location: Sydney, Australia
Posts: 32
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Creek 5050 intermittent fault
Hello all,
I've been given a Creek 5050 amplifier to look at by a friend in my running group. It looks in great condition externally. Apparently it has developed a fault where it runs fine for about 5 minutes, then suddenly the output vanishes. Given some time, and being turned off, the output reappears. I'll try and get more details during this Saturday's run, if the pace isn't too fast... I imagine there's some type of (thermal?) protection circuit operating. I'm away from home at the moment so I haven't had a chance to look inside at the moment. Does anyone have a schematic, and even better, some idea of what may be causing this before I put it on the bench and see what happens? thanks for any ideas, Andy |
19th Nov 2018, 12:53 pm | #2 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,535
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Re: Creek 5050 intermittent fault
There are some threads on diyAudio about this amp with a suggestion that Creek may provide info if contacted. The failure you describe sounds very similar to one there...... you could be looking at something of an output stage rebuild (x2)
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19th Nov 2018, 1:26 pm | #3 |
Heptode
Join Date: Jul 2014
Location: Boston, Lincolnshire, UK.
Posts: 995
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Re: Creek 5050 intermittent fault
Just from photos online (e.g., 4th photo in the link below), it may have a thermal cut-out mounted directly to the heatsink, which looks to be associated with the main transformer wiring - so if when you say "suddenly the output vanishes", you mean the amp shuts down completely, that could be the protection operating.
https://muare.vn/posts/ampli-creek-5...ngland.3792626 IF that's the case, then either faulty thermal cut-out (probably unlikely), or as Chris says, overheating output stage (most likely). I'd start by emailing Creek anyway - it's free, and might help a lot. |
20th Nov 2018, 12:44 pm | #4 |
Triode
Join Date: Apr 2012
Location: Sydney, Australia
Posts: 32
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Re: Creek 5050 intermittent fault
Thanks for the ideas. I've contacted Creek, and I'll see if I can get at least a schematic. I'll also take a look inside the 5050 once I get home,
Andy |
4th Dec 2018, 4:40 am | #5 |
Triode
Join Date: Apr 2012
Location: Sydney, Australia
Posts: 32
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Re: Creek 5050 intermittent fault
Just to wrap this up, I fired up the Creek and it ran quite happily for hours. The owner then took it to a hi fi shop for a second opinion where it did the same thing. So perhaps the fault has gone away or is associated with particular speakers/wiring.
We'll see if the fault reoccurs when it returns to the farm and is put back into service.... |