I also had an MV45 about 20 years ago. Along with a PV5 purchased a year earlier, these comprised my first all tube system. Had to send the pre-amp back for repairs twice and the amp once. I then decided to go with transistors in about 1990 but lost interest in music listening. Had to go back to tubes to find myself planted in the sweet spot for any length of time. I found CJ very helpful during all three repair shippings and they even twice sent back new phono tubes with the pre.
However, I think my mid 80s experience with CJ stuff was rather typical. I also bought a PV3(4?) in 1983 which had a resistor go bad (how does that happen??) and CJ fixed it. All four times repairs were done I paid shipping to them and CJ paid for return shipping. No complaints with their customer service then. I'm sure, however, their stuff from the last 10 years is very reliable. Have heard nothing about problems.
By the way, I haven't had a tube amp/pre-amp problem with anything since going back to tubes 15 years ago. Longest time with one piece was an Air Tight amp owned for over four and one half years, it performed flawlessly and made great music.
However, I think my mid 80s experience with CJ stuff was rather typical. I also bought a PV3(4?) in 1983 which had a resistor go bad (how does that happen??) and CJ fixed it. All four times repairs were done I paid shipping to them and CJ paid for return shipping. No complaints with their customer service then. I'm sure, however, their stuff from the last 10 years is very reliable. Have heard nothing about problems.
By the way, I haven't had a tube amp/pre-amp problem with anything since going back to tubes 15 years ago. Longest time with one piece was an Air Tight amp owned for over four and one half years, it performed flawlessly and made great music.