You're well versed and educated. I enjoy the format of your videos as well. I appreciate how you spend the right amount of time with explanation, repair, and some theory. Keep up with the same format and I think your channel will grow.
Thanks for posting this and for taking the time to explain in detail. I have two of the CP400 Amps and was experiencing the same symptoms. The fix was replacing those 3 caps as shown in your video. The fan resistor on one of my units is in "new condition". 4 band resistor (Red, Red, Brown, Gold).
The caps should have been 105C rated so a weak point but the repair is easy enough. Your resistor color code is 220 ohms. Mine was measuring 290 ohms no doubt damaged from the heat. The 150 ohm replacement worked well. I think the 220 ohm puts the fan right on the edge of stalling out. 150 ohms gives a little safety margin. Thanks for watching!
I tend to use an AC mains fan with full power being that of the mains voltage. The normally open thermal switch would have a capacitor across it giving a normally slow run. As the switch heats it shorts out the capacitor giving a full supply to the fan. The capacitor generates no heat in use, unlike the resistor. Regarding the transformer bolt, be sure it cannot make a complete circuit should the bolt touch the top of the lid. If it's close, a piece of insulation material will prevent something nasty happening.
Excellent job, Erik. I really appreciated the explanation on the distributed voltage speaker system and how they work. Does the type of transformers used effect the frequency response output at the speaker? Thanks for sharing.
Thanks for watching! Yes the transformer will have an affect on the frequency response. Typically they are not hi-fi grade so the extreme ends of the audio spectrum roll off a bit sooner with these transformers but typically not an issue given the purpose of distributed audio applications. I'm sure there are very expensive transformers that perform well if that audio quality is needed.
Thanks for sharing the video! Never came across the distributed audio system, so I learned something knew today ;) Would these kind of systems still be used today?
I used a 500-watt mono power amplifier in multiplex cinemas for the piped music in the foyer, corridors, toilets etc. The main advantage of the 100volt system is almost no loss on long cable runs. Each speaker or speaker cabinet can have the correct level set. Foyer cabinets may have a 40-100 watts each were as a speaker in the toilet might only be set to 1 watt, possibly less. As for quality, this can be very good. All depends on the transformers used. Small cheap ones have poor bass and treble. But fine in low level applications like toilets and corridors. Such amplimers tend to be REALLY big and heavy..
Why didn't you utilise the power filter capacitors and use both banks considering it was there and use on each one a lower capacitance. What's the name of that box that's eliminates hum called
After examining the unused filter cap positions I found they were connected in series with the existing cap on the rail. This would allow for higher voltage DC rails in the higher wattage version amp. Installing caps in series will not increase the capacitance value so there was no advantage to add them. The box is called Buzz Off HE18 made by Rolls. Parts Express has them.
I have big heavy amplifier like this one when I'm playing it go to protect mode the clip light not working wish if you could help me fix mine,the brand is xv 600 stereo power amplifier BITTNER, Let me know if you can help me
If the amp works normally and then goes to protect it could be overheating, perhaps a cooling fan issue. More serious could be the bias is too high and making the amp run hot. Or the output load is too low of impedance. Testing the clip limit light.. the best way is to use a dummy load and 1 kHz test signal, monitor the output with an oscilloscope and watch for clipping and see if the indicator turns on.
Im confused.. How its 160w x2 into 8 ohm.. But 500w bridged mono at 8 ohm?!?! How can bridged output power, Be more than the output of both channels combined? 2x 160w bridged, would be 320w.. Since bridging essentially doubles the power... Although, Not 100% efficiently may i add.. So 99% of the time, you dont even get double power... So how is 500w possible, from 2 channels combined, that give 320w combined?
The reason the wattage isn't simply doubled in bridge mode is because wattage (power) is equal to voltage squared divided by resistance. P=V^2/R So for this amp: 160 watts is 35.78 volts RMS into 8 ohms. Bridge mode doubles the amplifier output voltage so you have 71.56 volts RMS into 8 ohms which is 640 watts but allow for losses in the output stage, etc the realistic rating becomes 500 watts at 8 ohms.
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You're well versed and educated. I enjoy the format of your videos as well. I appreciate how you spend the right amount of time with explanation, repair, and some theory. Keep up with the same format and I think your channel will grow.
Thanks for the kind words and I'm glad you are enjoying the channel. I appreciate the feedback!
Thanks for posting this and for taking the time to explain in detail.
I have two of the CP400 Amps and was experiencing the same symptoms. The fix was replacing those 3 caps as shown in your video.
The fan resistor on one of my units is in "new condition". 4 band resistor (Red, Red, Brown, Gold).
The caps should have been 105C rated so a weak point but the repair is easy enough. Your resistor color code is 220 ohms. Mine was measuring 290 ohms no doubt damaged from the heat. The 150 ohm replacement worked well. I think the 220 ohm puts the fan right on the edge of stalling out. 150 ohms gives a little safety margin. Thanks for watching!
Finally another channel with somebody who has amazing diagnostic skills and explains theory of operation. Great video..
thanK you for the knowledge
You're most welcome!!
Great job Erik! Clear and concise communication.
Thanks for watching and the nice compliment!
Very enjoyable and thank you for your excellent demonstration of the distributed audio setup.
Thanks for watching, glad you enjoyed the video.
I tend to use an AC mains fan with full power being that of the mains voltage. The normally open thermal switch would have a capacitor across it giving a normally slow run. As the switch heats it shorts out the capacitor giving a full supply to the fan. The capacitor generates no heat in use, unlike the resistor.
Regarding the transformer bolt, be sure it cannot make a complete circuit should the bolt touch the top of the lid. If it's close, a piece of insulation material will prevent something nasty happening.
Yes, keeping the transformer bolt isolated is VERY important. A shorted turn is a bad thing and a LOT of current can flow.
Enjoy very much your explanation, glad I found your channel. Hope to see more of your video in the future.
Thanks for watching and I'm happy to know you enjoy the content on my channel.
how will this amp ever break again ? Great Job !
Excellent job, Erik. I really appreciated the explanation on the distributed voltage speaker system and how they work. Does the type of transformers used effect the frequency response output at the speaker? Thanks for sharing.
Thanks for watching! Yes the transformer will have an affect on the frequency response. Typically they are not hi-fi grade so the extreme ends of the audio spectrum roll off a bit sooner with these transformers but typically not an issue given the purpose of distributed audio applications. I'm sure there are very expensive transformers that perform well if that audio quality is needed.
@@EriksElectronicsWorkbench Thanks for your response.
Nice repair and thank you for sharing that amount of information. Sadly it looks the trend: expensive equipment loaded with el cheapo caps :-(
Thanks for watching! Yes for the cost of this amplifier better ratings on the capacitors would be expected.
Thanks for sharing the video! Never came across the distributed audio system, so I learned something knew today ;) Would these kind of systems still be used today?
Yes the distributed audio system is very common in commercial setups and is used in modern systems.
I used a 500-watt mono power amplifier in multiplex cinemas for the piped music in the foyer, corridors, toilets etc. The main advantage of the 100volt system is almost no loss on long cable runs. Each speaker or speaker cabinet can have the correct level set. Foyer cabinets may have a 40-100 watts each were as a speaker in the toilet might only be set to 1 watt, possibly less. As for quality, this can be very good. All depends on the transformers used. Small cheap ones have poor bass and treble. But fine in low level applications like toilets and corridors. Such amplimers tend to be REALLY big and heavy..
Why didn't you utilise the power filter capacitors and use both banks considering it was there and use on each one a lower capacitance. What's the name of that box that's eliminates hum called
After examining the unused filter cap positions I found they were connected in series with the existing cap on the rail. This would allow for higher voltage DC rails in the higher wattage version amp. Installing caps in series will not increase the capacitance value so there was no advantage to add them. The box is called Buzz Off HE18 made by Rolls. Parts Express has them.
My crest cks1200 - 2's do this exact same thing
I have big heavy amplifier like this one when I'm playing it go to protect mode the clip light not working wish if you could help me fix mine,the brand is xv 600 stereo power amplifier BITTNER, Let me know if you can help me
If the amp works normally and then goes to protect it could be overheating, perhaps a cooling fan issue. More serious could be the bias is too high and making the amp run hot. Or the output load is too low of impedance. Testing the clip limit light.. the best way is to use a dummy load and 1 kHz test signal, monitor the output with an oscilloscope and watch for clipping and see if the indicator turns on.
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Im confused.. How its 160w x2 into 8 ohm.. But 500w bridged mono at 8 ohm?!?!
How can bridged output power, Be more than the output of both channels combined?
2x 160w bridged, would be 320w.. Since bridging essentially doubles the power... Although, Not 100% efficiently may i add.. So 99% of the time, you dont even get double power...
So how is 500w possible, from 2 channels combined, that give 320w combined?
The reason the wattage isn't simply doubled in bridge mode is because wattage (power) is equal to voltage squared divided by resistance. P=V^2/R So for this amp: 160 watts is 35.78 volts RMS into 8 ohms. Bridge mode doubles the amplifier output voltage so you have 71.56 volts RMS into 8 ohms which is 640 watts but allow for losses in the output stage, etc the realistic rating becomes 500 watts at 8 ohms.
Each channel sees 4 ohms. 250 watts per channel at 4 ohms per channel
Thats a cheap crap built amp. First one ive seen the guts on. Nothing like the QSC or Crown amps i work on . Looks more Prosumer than Pro .