Hello this is rishiguru. I am a newbie and have very little knowledge about DIY. My friends audio amplifier is broke we have opened the cabinet and found that a pair of A1943/C5200 is used per channel of the two channel amp.
Now, one of the C5200 is burnt, so below is the image of the other pair(which seems ok).
Can anybody tell the name of the manufacturer & the specs like power output, voltage and current ratings of this pair. The amp is rated 125 watts X 2. the transfo outputs +/-30V to this two pair of transistors. Is the current rating 5A (not quoted on the transfo)?
It also have 4, 4700uF, 50V capacitors used as ripple filters
Also cannot find CKT brand name? Where we can buy this exact pair?
I found the 2sc1943 at all of these but not from CKT.
Newark, Farnell, Mouser Electronics, TTI, Avnet Express, arrow, MCM Electronics, Quest Components
Maybe someone will have old stock. Good luck
If you can hear the difference between CKT and Toshiba then there may be something else wrong.
I found the 2sc1943 at all of these but not from CKT.
Newark, Farnell, Mouser Electronics, TTI, Avnet Express, arrow, MCM Electronics, Quest Components
Maybe someone will have old stock. Good luck
If you can hear the difference between CKT and Toshiba then there may be something else wrong.
The transformer is sizebale. From what i heard you need a minimum of 300Va tranfo to pump out 250 watts of power @ 4 ohms. So, i was thinking +/-30V, 5A from the transfo. (ampere not quoted on the transfo)
the transfo have two secondaries +/-30V to the power amps (two sets of the above transistors) & +/-15V to the op amp circuit.
Well here is the info i was able to gather regarding the amp. And yes this CKT A1943/C5200 transistors belong to Taiwan. Do not know the manufacturer yet.
1: the primary fuse rating. :T3AL250V.EI
2: the physical dimensions of the transformer.: Diameter: 11 cm, Height: 6 cm
3: the rating of the secondary rectifier diodes:
i) Secondary +/- 30V --> Diodes used is two pairs of 6A4 MIC, Caps: two pairs of 4700uF, 50V --> goes to power amp
ii) Secondary +/- 15V --> Diodes used is two pairs of "MIC", Caps: two pairs of 1000uF, 25V --> goes to pre amp
4: the amplifier module fuse ratings: Each of these A1943 or C5200 have one T3AL250V.EI fuse. Total 4 fuse for four transistors.
You said the power supply is plus and minus 30V which is a total of 60V. Then the output swing is aboput 54V p-p which produces about 91W into 4 ohms at clipping. Maybe the output is 56V then the output power is 98W into 4 ohms.
I think the amplifier manufacturer is lieing about how much output power.