Hi all,
I got my hands on a non-working Creek 5050.
The amp would not turn on, and previous owner stated that it was serviced about a year before and was working fine, until one day it suddenly stopped working while playing music.
The fuse was blown so I replaced it and upon turning it on the new fuse immediately blew and the amp shut off.
I opened the top cover and noticed that the 10000uf caps were not the original Rubycon but something unrecognizable and slightly bloated.
I've also noticed that 2 resistors were not of the correct value and that the TIP35/36 transformers were also replaced but were of differing brands/series.
I replaced the resistors to correct value (based on the right side and the schematic), the 10k uf caps and replaced the TIP35/36 for both channels.
Turning it on again, 2 resistors on the left channel immediately burned and black smoke rised. The amp stayed on though and the new fuse did not blow.
I want to replace those 2 resistors but my main concern is that something else is wrong and when I replace them then they will just burn again.
Is it likely that these resistors were already partially damaged from the previous issue and now burned entirely when voltage was passing through them?
Or is it more likely that there is still a different issue regardless of those?
Any tips on troubleshooting this.
Thanks!
First photo is of the original state.
Second photo is after I replaced the above parts and showing the burned resistor.
I got my hands on a non-working Creek 5050.
The amp would not turn on, and previous owner stated that it was serviced about a year before and was working fine, until one day it suddenly stopped working while playing music.
The fuse was blown so I replaced it and upon turning it on the new fuse immediately blew and the amp shut off.
I opened the top cover and noticed that the 10000uf caps were not the original Rubycon but something unrecognizable and slightly bloated.
I've also noticed that 2 resistors were not of the correct value and that the TIP35/36 transformers were also replaced but were of differing brands/series.
I replaced the resistors to correct value (based on the right side and the schematic), the 10k uf caps and replaced the TIP35/36 for both channels.
Turning it on again, 2 resistors on the left channel immediately burned and black smoke rised. The amp stayed on though and the new fuse did not blow.
I want to replace those 2 resistors but my main concern is that something else is wrong and when I replace them then they will just burn again.
Is it likely that these resistors were already partially damaged from the previous issue and now burned entirely when voltage was passing through them?
Or is it more likely that there is still a different issue regardless of those?
Any tips on troubleshooting this.
Thanks!
First photo is of the original state.
Second photo is after I replaced the above parts and showing the burned resistor.
Attachments
Does not make sense for that resistor to burn after your repairs. Maybe you introduced a different problem.
Always put an amp on a bulb tester after repairs to ensure that something else do not get damaged. If the bulb lights up brightly, start measuring voltages, starting at the emitter resistors and on the output to signal ground, and so on.
Always put an amp on a bulb tester after repairs to ensure that something else do not get damaged. If the bulb lights up brightly, start measuring voltages, starting at the emitter resistors and on the output to signal ground, and so on.
I have one of these
Have you resolved this? If not, use TIP35C and TIP 36C (not A or B). The BC range transistors are cheap so replace all the 639s and 640s. Use a matched pair for the drivers. Creek recommend changing BC556 for a BC640. I also changed TR9 for a ZTX653 - it runs cooler. With this circuit only one defective transistor blows all the drivers and output transisitors but it sounds really good when working.
Have you resolved this? If not, use TIP35C and TIP 36C (not A or B). The BC range transistors are cheap so replace all the 639s and 640s. Use a matched pair for the drivers. Creek recommend changing BC556 for a BC640. I also changed TR9 for a ZTX653 - it runs cooler. With this circuit only one defective transistor blows all the drivers and output transisitors but it sounds really good when working.
Effective June 2012 these TIP*** device will be available only in the TO−247package. Reference FPCN# 16827. Looks like old stock parts were used.
If the emitter resistors fail, the bias voltage is wrong.
If the emitter resistors fail, the bias voltage is wrong.
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