Hello,
originally in this phono amp was Electro Harmonix 12AX7. Long years I was using Tesla E83CC or Tesla ECC803S tubes without problem.
I also changed original OPs to AD829. Due to this change I had to change also capacitors and trasistors to make this OPs works (also change PCBs routes etc.).
After years my tubes starts dying and I made decisiont to buy new ones.
First I tried Svetlana 12AX7LPS but it does not work. I return it to shop for test and it works for them. But they return me money and I bought another tubes, Tung-Sol 12AX7/ECC803S gold pins. But also these tubes do not work. Both, Svetlana and Tug-Sol was/are warm, but no light and no sound. When I put back Tesla, it works.
At this moment I dont know whats going on here.
Do anybody have any idea?
Thank you
originally in this phono amp was Electro Harmonix 12AX7. Long years I was using Tesla E83CC or Tesla ECC803S tubes without problem.
I also changed original OPs to AD829. Due to this change I had to change also capacitors and trasistors to make this OPs works (also change PCBs routes etc.).
After years my tubes starts dying and I made decisiont to buy new ones.
First I tried Svetlana 12AX7LPS but it does not work. I return it to shop for test and it works for them. But they return me money and I bought another tubes, Tung-Sol 12AX7/ECC803S gold pins. But also these tubes do not work. Both, Svetlana and Tug-Sol was/are warm, but no light and no sound. When I put back Tesla, it works.
At this moment I dont know whats going on here.
Do anybody have any idea?
Thank you
