valvecaster current draw

[bagudan]

Hi. Planning on douing a valvecaster with internal regulated powersupply... cause I have trafos lying around. Will a 15 v 120 ma transformer do?
Kasper

[frequencycentral]

Too low - the heater alone of a 12au7 draws 150ma. At 120ma all it will do is hum.

[bagudan]

ok...thanks... these cheap-ass trafos are of no use:)

[frequencycentral]

Having said that, a Valvecaster won't draw too much over 150ma in total - the plates draw very little current, it's the heater that's greedy. I bet you'd get away with 200ma.

[bagudan]

supeer... maybe I have one of those?

[kurtlives]

Too low - the heater alone of a 12au7 draws 150ma. At 120ma all it will do is hum.

Pretty sure they draw 300mA when hooked up the way they are in the VC. I am actually certain it is 300mA.

[frequencycentral]

Pretty sure they draw 300mA when hooked up the way they are in the VC. I am actually certain it is 300mA.

12AU7 data sheet says different: http://frank.pocnet.net/sheets/127/1/12AU7.pdf

Series (as in the Valvecaster): 12.6v @ 150ma
Parallel: 6.3v @ 300ma

[kurtlives]

Ah that's right. I wired mine in parallel.