Hi.
Does anyone have any suggestions how to fix this?
http://www.warwick.de/media/manuals/Sweets/SWEET_25.1.pdf
I have Warwick Sweet25.1 combo with burned output stage. Exactly transistors Q27 and Q30 (the schematic is attached). I replaced them, turned the amp on via the electric bulb (it’s a good method to start the amp for the first time after power section repair). I measured idle current through R113-R116 resistor and set it around 70mA. I put some music from CD player to input. Everything was ok. Then I connected power supply cord directly (without the electric bulb). After that the amp was working for about 5 minutes, than there was not very loud click in a speaker and again Q27 and Q30 were dead. And F1 fuse was burned too. When I soldered Q27 and Q30 out the amp was still working ok but without them.
I tried this twice 🙂 Does anyone have any suggestions how to fix this?
http://www.warwick.de/media/manuals/Sweets/SWEET_25.1.pdf
I’m not sure that they are genuine. The marking on the top of the package was correspondent. I also checked voltage drops across BE, BC, CE – they were fine. (Before the installation) How can I check new one transistors that they are genuine?
- Status
- Not open for further replies.