I am trying to design a PSU for a simple ECC88 line stage with a broken PSU. The original one has SS rectification but I'd like to rebuild it completely using EZ81 followed by CLCLC filtering. The reason for the EZ81 is that I have a lot of them! I used the super-cool PSUD2 software but I have some problems because it says that the input current at start is too much. I need to feed a 40mA load at B+ = 250V?
The max input cap suggested for the EZ81 is 50uF so I played around with values like 30uF and 25uF but the PSUD2 still says that there are problems. I should keepp the first cap down to 10-15uF to solve the problem... but I've never seen such a small input cap in a CLCLC filter.??
Now, searching the web I found people saying that with the EZ81 it is important to reach the series resistance stated in the datasheet. My transformer has a secondary rated at 70 Ohms so probably I need something around 100 Ohm. This resistor should go between the secondary and the EZ81's anode, but it seems it is not possible to add it on PSDU2. I am almost sure that this is the same setting? 170 Ohm in the secondary in PSUD2, am I?right?
The other thing is about experiences with the EZ81. If somebody worked with this tube and he's willing to share some experiences, it would be great to get any suggestion!
