A question about Mesa LSC tweed setting.

[ur86d]

I was wondering if one of your more tech oriented people could answer this question for me. Or maybe even give me a mathmatical formula so i could figure it out. Either one would be appreciated.

I have a 2007 Lonestar, the one we the added 10watt option. In the manual it states that when the amp is operating in the tweed setting, you enable a built-in VARIAC ; Which reduces the line voltage to around 93 volts. (with a steady 117 at the wall)

So my question is, what does that mean when the amp is set to 100 watts, 50 watts and 10 watts? Basicaly i'd like to know how many watts the amp is putting out in each setting, when operating it in tweed mode. Assuming of course that i have a steady 117 at the wall.

[John Phillips]

Reducing the input voltage from 117 to 93V will reduce all the internal voltages proportionately, to 93/117 or 79% of the values at the full voltage.

This should give a power output of 63% of that at the full voltage, since power is proportional to the square of voltage.

Although, by reducing the power, the amount of sag in the power supply will also be slightly less, so the overall power reduction will be very slightly less than you'd expect - I would guess you'll get around 70% of the power, in any given setting, although the 10W setting will be less affected than the other two.

I remember getting somewhere around this on my Trem-o-verb, which has the 'Spongy' mode which does the same thing, although I don't know if the voltage ratio is exactly the same.

[ur86d]

Thank you Mr. Phillips. An educated guesstamation is all i was after.