Hi Guys,
I have my Classe Ca-200 amp blew up on me a few days ago. I opened it up and found two of the 18 heat-sink mounted transistors have burned. I have tested the remaining 16 and they are ok. There were two small transistors that I can figure out the part number for them. The one for the left channel is labeled as Q108 and Q208 for the right channel on the board Here is a copy of the section of the schematics for the left channel of the amp. Can someone please help me identify the part number for Q108?
I have my Classe Ca-200 amp blew up on me a few days ago. I opened it up and found two of the 18 heat-sink mounted transistors have burned. I have tested the remaining 16 and they are ok. There were two small transistors that I can figure out the part number for them. The one for the left channel is labeled as Q108 and Q208 for the right channel on the board Here is a copy of the section of the schematics for the left channel of the amp. Can someone please help me identify the part number for Q108?
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Since Q110/111 already have a slight negative tempco , Q108 is just there to add more neg. tempco ?
Strange to see that on a latfet output stage ??
OS
Strange to see that on a latfet output stage ??
OS
If you are unable to find the original part number, I believe the part is not that critical. Note that the circuit is shunted by C110, so speed isn't much of an issue and applied voltage is low. Figure out the package type as mechanical compatibility is key. Choose a part with reasonably high Beta.
Be sure to set the trim pot to maximum resistance for initial setting and use caution in adjusting; if you set the resistance too low, the spreader voltage will become destructively large and destroy the output FETs.
Be sure to set the trim pot to maximum resistance for initial setting and use caution in adjusting; if you set the resistance too low, the spreader voltage will become destructively large and destroy the output FETs.
