12V Tube Power Supply Amperage Question

[Freekmagnet]

I'm gathering parts for my first 12V tube pedal, and though I know that this topic has been covered elsewhere, I just need to double check so I don't fry anything.

I have a 12V wall wart that I got from a wireless router that crapped out. It says that the input is 0.3A and that the output 1A (which doesn't make sense to me).

From what little I understand, the pedal will merely draw the amperage that it needs from the power supply, so as long as the adapter can handle more than 500mA I'm OK. Is this assumption correct?

I'm going to Death Valley for the weekend, so if I don't reply right away, that's why!

Thanks!

[Ice-9]

From what i understand the wallwart you descride will consume 0.3w from the 240v mains (or 110v other countries) and can deliver 1amp at 12v output. You do not mention if it's a DC or AC 12v output which will matter, it's probabaly 12v DV. A circuit will only draw the current it needs, a PSU can have more output current than needed but obviously can't have a lower current than what is needed.

If your using 12AX7s etc the heaters alone can need 300ma

[Freekmagnet]

Thanks for the reply - that clears a few things up for me.

And yes, it will draw from 240v form the wall. Output is DC, and I'm going to be using a pair or 6111 tubes.

Thanks again.

[frequencycentral]

I'm going to be using a pair or 6111 tubes.

Run the two heaters is series from 12 volts and they'll only consume 300ma between them, plus a few ma for each plate.