Maximus89 Posted February 21 Share Posted February 21 I purchased a vintage 100v Japanese tube preamp and after weighing the options(voltage converter, bucking transformer, variac), i decided with a vintage General Radio W10MT3A variac/variable transformer. Assuming the variac works, i am wondering if i can use it connected to my Isolation transformer that is able to connect 600va max. The variac allows 10amp and 2 amp selection. How does this translate to power usage to know if my Isolation Transformer can handle it along with my 50wpc McIntosh MC250, and a tube dac, and a 50watt vintage subwoofer all connected to the same isolation transformer? Quote Link to comment Share on other sites More sharing options...
Maximus89 Posted February 21 Author Share Posted February 21 further info, my tube preamp has 1amp fuse the isolation transformer says 8amp fuse Quote Link to comment Share on other sites More sharing options...
JohnA Posted February 27 Share Posted February 27 Look at the rear labels for all of the pieces and add up the max VA or max watts. Watts = Volts x Amps. So, your xfmr's 600 VA rating is essentially 600 watts (OK, not quite because the voltage sine wave is/can be out of sync with the current wave.) Leave some room for start up in-rush current and turn on one thing at a time. I think you'll be close to max capacity. FYI, fuses will pass 2x their rating for a short time before opening and maybe oversized. They are primarily for fire protection, thus not a good measure of load or capacity. Quote Link to comment Share on other sites More sharing options...
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