170V DC High Voltage Power Supply Module Boost Converter for Vacuum Tube, Nixie Tube Clock, Magic Eye 6E2 Level Indicator 10V-24V DC Input, 90V-250V DC Output (Blue)

Would buy it again in the future.

Good unit. Using for NIXIE project. Tested. Bought two. Both work fine. Remember, the voltage at the output is high. Even though the current is low you can still get a bite! Use caution especially if you have a pacemaker! Things get really exciting then! LOL

I used this to power a single 12AX7 in a bass preamp. Works like a charm!!

I believe this was made for Nixie clocks. Check your power requirements. Forget about powering 12Ax7s.

I don't know if the circuit on the other flavors of this board is better, but the "black" board version is garbage.I'm 0-2 on these things. I've built linear power supplies in the past. There is nothing special about them. But they're big, heavy, and inefficient, so I tried to take a short cut. It turned out to be a waste of time.The first one, 12V input, 11V output. Adjustment did nothing.Exchanged for a 2nd.Exact same thing - 12V in, 11V out, no adjustment.And oh, to the person who designed this board, would it have killed you to add a 2nd mounting hole?

Works great. Produces the advertised voltages and is very stable. Only issue is if you plan to enclose this at all or maybe run it for extended periods of time, get a heatsink for the IRF740. It will get very hot!! Other than that, highly recommended!!

Adjusted it to 170v. Hooked it to a nixie and it worked great! I think a heat sink will be needed as the To package gets a bit warm.

Worked ok for a few hrs and then the output dipped to 70 volts max.