Power Consumption

[Shakey 1047]

This may be in the wrong section and may be an unanswerable question.
Does anyone know how much power a preamp consumes in a combo? I am thinking particularly of a Peavey Nashville 1000. I need to build a power supply to run one of these but have no idea what transformer to use. I know the feed voltage is +/-15volts DC, so I suppose I shall need an 18-0-18v but what VA. Anyone have any ideas??
Cheers.

[loudthud]

I'm not finding the schematic online, just the user manual. It uses a 300W at 4 ohm switching power amp. Got a link or schematic you can post? Probably a 20VA transformer would work but just to be sure I need to look at the schematic. One way to go would be to power the preamp up from a bench supply and just measure the current draw.

[Shakey 1047]

NASHVILLE_112.pdf I believe the 112 and the 1000 use the same preamp.

[Enzo]

The preamp draws very little. It has like 5 op amp ICs and a analog switch IC. +/-15vDC at not very much. If you make something typical like 1 amp Vregs, it will be fine. It won;t need nearly a whole amp, but such a supply should run cool.

[loudthud]

It looks to me like the preamp draws less than 200mA AC or the 22 ohm "fuses" (R85, R86, R87 and R88) would smoke. Probably less than 100mA DC.

[Shakey 1047]

Thank you Loudthud for the info, I have a 20VA transformer so I can get on with it. Thanks again.