karlos the dc300a

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About karlos the dc300a

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  • Birthday 07/06/1967

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  1. Genuine transistor or cheap Chinese copy? New transistor insulator?
  2. Maybe half an input ic burnt?
  3. Have you checked the output zobel network?
  4. Hello Karlos,

    it would be great is you know what the problem is with my DC300A !

    Frederik.

     

  5. Hello. Sounds like you have some dc voltage at speaker terminals. Pm me for details.
  6. Crown supply an unilluminated replacement switch.
  7. The heatsink were standard on certain dc300a amps. Have seen them before. Theyre fine as long as the spring clips are holding ok.
  8. I wouldn't bother replacing with Jamicons again.
  9. Non standard input module for sure best to look at the ceramic resistor on the output pcb to find date code on the .33 ceramic resistors. It's standard four figure code. All dc300a amps have a four figure part number on the underside of the main pcb that ties up with particular schematic.
  10. Hi have you the crown p/n from schematic.
  11. I have seen 1n270 used instead of 1n4148 on crowns. i will have a look at my service updates tonight.
  12. I know you are working on the d75. Its a mod on the ioc circuit that was also done on early / mid dc300a. have a look on dc300a schematics, its gone from my mind but i know its a mod on all ioc circuits, sorry i cant help any more, my head isnt working today!
  13. Hi guys, Just wondering if anyone has had success with a replacement for C5869? (dc300a T03 driver). crown state its a 2sd555s. Has anyone found a more modern equivalent? Thank you
  14. To be honest im not sure about the 62085. 2n3773 are usually ok, the trouble these days are finding decent original genuine transistors, there are so many fakes about. use a reputable supplier farnell rs comps etc etc
  15. Hows it going?