Omtec Mono Power Amplifier "CA 25" (CA25) - Schematic wanted - diyAudio
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Old 9th February 2010, 03:56 PM   #1
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Default Omtec Mono Power Amplifier "CA 25" (CA25) - Schematic wanted

For this mono block device I need a schematic diagram. There isn't a download aera for PDF schematics. Only for the Owner's Manuals of all models
http://www.omtec-audio.de/dwnl/usrm/usrm.shtml
and I have heard, that no schematic would be released (like Krell Industries).
So I must hope, one of the members have an own created schematic
If so, please let me know - thank you very much
Attached Images
File Type: jpg Omtec CA25 front+top.jpg (35.7 KB, 575 views)

Last edited by tiefbassuebertr; 9th February 2010 at 03:58 PM.
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Old 22nd April 2014, 01:20 PM   #2
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any news?
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Old 17th June 2014, 12:59 PM   #3
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schematics available there (also for CA60):
Gebrauchte HiFi Geräte kaufen - Spring Air Second Hand HiFi Shop
http://www.springair.de/bastlergerae...endverstaerker
Unfortunately, this will not be sent to user's - they are only used to repair there.
After all, there is now an address for repair and cost estimate of this amp models.
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Old 3rd January 2015, 09:11 AM   #4
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who can upload measuring results of this power amps?
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Old 21st May 2015, 01:02 PM   #5
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Hi,

habe gerade mit springair telefoniert. Schaltpläne sind zu 99% vorhanden???? Jedenfalls kein Commitment.

Mein Problem: Meine Ca25 V1 werden ungleich warm. Ich würde gerne den Ruhestrom einstellen. Wo liegt der Zielwert?

Manni Baier ist unter der Nummer, die google findet nicht erreichbar. Ich würde auch gerne seinen Service in Anspruch nehmen. Kann mir jemand weiterhelfen? Evtl. auch mit Schaltplänen, Abgleichanleitungen??? Mannis Telefonnummer per PN wäre auch attraktiv.

Danke.
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Old 27th April 2017, 01:26 PM   #6
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in one of the next weeks I will get a pair devices of this model for checking the situation. Was since approximately 6 years not in use.
Who know, how many different versions are on the marked?
Thank you for advices.
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Old 1st May 2017, 01:28 PM   #7
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The power mono amps arrived. Some pictures:
Attached Images
File Type: jpg DSCF1863.jpg (998.7 KB, 181 views)
File Type: jpg DSCF1864.jpg (991.7 KB, 172 views)
File Type: jpg DSCF1865.jpg (952.4 KB, 158 views)
File Type: jpg DSCF1867.jpg (1,001.5 KB, 152 views)
File Type: jpg DSCF1873.jpg (926.7 KB, 59 views)
File Type: jpg DSCF1876.jpg (1,021.7 KB, 42 views)
File Type: jpg DSCF1877.jpg (988.4 KB, 51 views)
File Type: jpg DSCF1882.jpg (990.2 KB, 55 views)
File Type: jpg DSCF1885.jpg (912.2 KB, 45 views)
File Type: jpg DSCF1892.jpg (988.8 KB, 35 views)
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Old 1st May 2017, 01:42 PM   #8
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more pictures PCB solder side
Attached Images
File Type: jpg DSCF1879.jpg (988.9 KB, 49 views)
File Type: jpg DSCF1881.jpg (1,017.2 KB, 54 views)
File Type: jpg DSCF1880.jpg (1.00 MB, 50 views)
File Type: jpg DSCF1878.jpg (922.9 KB, 50 views)
File Type: jpg DSCF1875.jpg (986.1 KB, 54 views)
File Type: jpg DSCF1884.jpg (844.5 KB, 43 views)
File Type: jpg DSCF1886.jpg (993.6 KB, 37 views)
File Type: jpg DSCF1896.jpg (932.8 KB, 74 views)
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Old 1st May 2017, 03:09 PM   #9
modmix is offline modmix  Germany
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Quote:
Originally Posted by tiefbassuebertr View Post
Who know, how many different versions are on the marked?
Unterschied Omtec CA 60 V2 und V3, Verstärker/Receiver - HIFI-FORUM
CA-25 und CA-60 Class-A-Monoblöcke
Baujahre 1985 bis 1998 (V1)

Omtec CA-25 V2 Class A Endstufen
Die Geräte stammen wohl aus 2003.
no class switch...
Would like to learn what tells v2 from v2...
Pricelist Omtec (Januar 2005):
CA-25 V3 2005
Review: Omtec CA-25 V3 Amplifier
25W for 8 0hm , 50 for 4ohms, Version3, Gain 22dB, Input Impedance>100kohms, speed rate 0,46 µs, Input RCA and XLR,
2 switches in front (one for on/off – the other one for Class A or AB)
hth
Ulli

PS:
I own CA-25s, too.
New caps might be a good idea - just in case you'ld like to share some info...

A while ago I had to re-solder the cap screws...
Omtec CA-25 Sprotzel-Reparatur_20120414 Elko draußen web.jpg

Last edited by modmix; 1st May 2017 at 03:23 PM.
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Old 5th May 2017, 11:55 AM   #10
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good informations - thank you very much.
If I look to your picture, I guess, there is a special soldering tin for soldering the aluminum terminals of capacitors in use.
Therefore the follow question rises up:
What is the best way to solder aluminum together with copper ?

in this case also this thread is of interest:
Outsider Mono Power Amplifiers

Last edited by tiefbassuebertr; 5th May 2017 at 11:57 AM.
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