Hi pals!

I'm following this thread a time ago because i'm interested in building a tube miniamp for bedroom practice.. but something hangs me out. I don't fully understand which is the amperage rating of this or other nixie supply units... Let's say if I power the whole thing from 1A 220 / 12v transformer, it would deliver 1A or it will shrink to the 10ma rating posted pages ago?. Could I use this nixie smps to power a SE tube power amp?

Hope you can help me

Sebastian.-

You cant get more power out of your wall wart then you put into it.... A 12V 1A transformer can supply 12 watts of power.

**Multiply voltage by current to get power. **At an ideal 100% efficiency voltage conversion, you should be able to get any voltage + current rating that when multiplied together equal 12 watts.... So You could get 48 volts, 250mA, 6V 2A,120V 100mA...

So you see, at high voltages you get very little current but it's still the same power. Of course, nothing is 100% efficient at power conversion, so you lose a decent amount of available watts in the process.

If you are making a tube amp with this you are limited by the amount of current the wall wart can supply, the amperage + voltage rating of your switching power supply.

I believe it was said 300V 100ma, so multipy those two together and you get 30 Watts. That doesnt mean you can make a 30 watt amplifier out of it, though... amplifiers use up current in many more ways than just straight out the speaker (especially tube, with their filaments) If you want the full available output power, then you would need your 12v wall wart to be... 30 watts / 12V = 2.5A. 12V 2.5A Wall wart.

**EDIT: Oops, it was 10ma. Thats 300V x 0.01A = 3Watts. Not enough to power a decent tube amplifier unless it is like a <1Watt... sorry. **You need to do your homework on your amp and calculate an estimate for power waste + speaker out, decide on your minimum power supply specs - and then find something above those (you don't want your amp barely getting by, you want some margin of safety)