High Voltage DC-DC Boost Converter 12V to 150V-420V 170V 230V & 1.25V-12V 6.3V Filament Adjustable Step Up Power Supply 2-Way PSU Regulator Module for Tube Preamp/Nixie Tube

Like most problems other are having. I purchesed 2 a few months ago and they work fine. I purchased two more last week and they are both bad. The HV regulation does not work. Either bad or damaged parts. Someone should notify the manufacturer to see if they can fix the problem, since it is a very useful power supply. I NEED IT!

I like this. I am using this to power a small vacuum tube amp that I built for my guitar. I can not crank to full voltage but I can get it up to about 200 volts and it runs a little warm but is stable and does not introduce noise into the amp. This works much better than having to have a high voltage transformer etc. You can run this off 12v batteries and get off the grid and play a tube amp without heavy transformers etc.

Works Perfectly ! Coil must be glued by silicon!

I'm using this to drive a 12AX7 tube circuit. There is a small-amplitude 14 Hz sawtooth on top of the HV, which shows up in the audio output. Bought two of these at the same time and both show this behavior.

really should work at 5 vdc , to be valuable. All these supplies need 12 vdc and tubes have 6.3 v . So 12 v is another power supply for a power supply . Might as well stay 60 hz Also USB is everywhere 5 vdc 2 amps . yet no 90-200 v supplies made Can this be modified for 5-7 vdc input

The high voltage circuit of this product does not work. When powered at the recommended 12 Volts, the output voltage was not stable, either with or without a 100 kOhm load. Its current draw from a 12 V supply started at 1.15 Amps at 233 Volts, dropped to 0.36 Amps, would fluctuate suddenly from 0.4 to 0.8 Amps. Thereafter, I could only adjust the voltage from 140 to 178 Volts. Again, the high voltage was not stable. The low voltage circuit of this product does work and is adjustable. I set it to mid-scale, 6.6 Volts.

Very good

As other commenters have said, the high voltage is completely unreliable - after setting it at about 300V unloaded, it drifted way down below 190V over time. Loading it made no difference. The heat sinked transistor is also super hot and I think the board has a massive thermal instability. Do not waste your money.