Hi Experts 🙂
Hope this is the right section.
I have a couple of Canton speakers that has been with me for over 20 years now. The model is CA-20 witch is a fully active four way construction with one amp board for each driver including a cross over section custom for the that driver.
In the past years I havnt been able to use them since there have been problems with clicking protection relays etc. All issues have be resolved now and all amp boards are amplifying signal within the frequencies they should on my work bench.
With their age and all (manufactured 1988) I have replaced all etyl caps in the PSU section and would also like to do so on each amp board.
There is a schematic but no other documentation. No text on PCBs at all. There are six pots on each amp. Could someone perhaps tell me from the schematic what these pot are adjusting? How do I set idle bias? Between were do i measure to get current bias mV? Most of them are in the cross over section so i'm guessing they adjust cut off frequencies etc?
This schematic, as an example, is the HT board, driving the Tweeter. (HP Filter) IC1 & IC4 are TL074CN
If I know how to set bias I can measure before and after cap replacement and then adjust if needed so I don't alter anything.
Any info here would be greatly appreciated as there is no info to be found anyware. Canton hasn't replied to my request for more service documentation and to be fair they are from the eighties so..
The sound awesome though!
I could not add the full schematic to this post but it can be downloaded here if anyone is interested:
https://elektrotanya.com/canton_ca-20_active_speakers_schematic.pdf/download.html
Thanks
Daniel E
Hope this is the right section.
I have a couple of Canton speakers that has been with me for over 20 years now. The model is CA-20 witch is a fully active four way construction with one amp board for each driver including a cross over section custom for the that driver.
In the past years I havnt been able to use them since there have been problems with clicking protection relays etc. All issues have be resolved now and all amp boards are amplifying signal within the frequencies they should on my work bench.
With their age and all (manufactured 1988) I have replaced all etyl caps in the PSU section and would also like to do so on each amp board.
There is a schematic but no other documentation. No text on PCBs at all. There are six pots on each amp. Could someone perhaps tell me from the schematic what these pot are adjusting? How do I set idle bias? Between were do i measure to get current bias mV? Most of them are in the cross over section so i'm guessing they adjust cut off frequencies etc?
This schematic, as an example, is the HT board, driving the Tweeter. (HP Filter) IC1 & IC4 are TL074CN
If I know how to set bias I can measure before and after cap replacement and then adjust if needed so I don't alter anything.
Any info here would be greatly appreciated as there is no info to be found anyware. Canton hasn't replied to my request for more service documentation and to be fair they are from the eighties so..
The sound awesome though!
I could not add the full schematic to this post but it can be downloaded here if anyone is interested:
https://elektrotanya.com/canton_ca-20_active_speakers_schematic.pdf/download.html
Thanks
Daniel E
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Hi Pastaman78,
Nice to se that you enjoy your old Canton active speakers and that you seems to take good care of them.
I have a pair of CA 15 and a pair of CA 20 that I have had since they were new - Yes, i Really enjoy the way they sound.
Best regards, Kattofonen
Nice to se that you enjoy your old Canton active speakers and that you seems to take good care of them.
I have a pair of CA 15 and a pair of CA 20 that I have had since they were new - Yes, i Really enjoy the way they sound.
Best regards, Kattofonen
Hi Kattofonen,
Good to hear there are still CA speakers in use out there., and in Sweden too 🙂 wonder how many there are. Maybe we have the last two pairs left 😆 Mine are working as they should after my repair. All elements are original. I am the second owner and have had them for about 25 years.
Have you had any issues with yours over the years?
/Daniel
Good to hear there are still CA speakers in use out there., and in Sweden too 🙂 wonder how many there are. Maybe we have the last two pairs left 😆 Mine are working as they should after my repair. All elements are original. I am the second owner and have had them for about 25 years.
Have you had any issues with yours over the years?
/Daniel
Hi Pastaman78,
It's been a while since we talked about Canton CA20 and you told me about your repair. I'm back to you to find out your interest in spare parts for the CA20. The reason for asking you is that I'm in a planning phase to change my living from a house to a flat, which will mean that my CA15 and CA20 will be available on the market. Let me know if you have an interest before I start up my work to sell.
/Per
It's been a while since we talked about Canton CA20 and you told me about your repair. I'm back to you to find out your interest in spare parts for the CA20. The reason for asking you is that I'm in a planning phase to change my living from a house to a flat, which will mean that my CA15 and CA20 will be available on the market. Let me know if you have an interest before I start up my work to sell.
/Per
Hej Daniel!!
Jag har ett par CA15 med trasiga steg pga elfel i huset. Säkringarna har inte gått.... sugen på att hjälpa till med en översyn???
.
Mvh Calle
Jag har ett par CA15 med trasiga steg pga elfel i huset. Säkringarna har inte gått.... sugen på att hjälpa till med en översyn???
.
Mvh Calle
Hello Kattofonen,
did you already move to a flat or is the Canton CA 20 still for sale ?
Kind regards,
Stefan