Currently Being ModeratedMar 29, 2012 2:14 AM (in response to jmwsys)Re: Variax 500 phantom power requirements
Thanks to amx05462 and Line6Tony for responding. AMX's comment re seeing somewhere that the Variax draws 800mA is the sort of thing I am after. I am working on the assumption that the rating on the factory supplied PSU has some headroom over and above the maximum needed to supply the guitar, not least because it also has to power whatever electronics are in the XPS box (either type) as well as the guitar itself.
It also has to deal with any power loss on the 25ft cable that comes with the instrument. I use a much shorter cable than this and will not need to allow for the XPS box in my intended application, so I am trying to arrange for a 9v (or whatever it is) supply from within the amp that will supply just enough current for the Variax & no more. Reason for this is that if the current drain is low enough, there may be sufficient spare capacity on the amp's transformer to supply this extra power feed. If this is so, it makes the mods to the amp relatively simple to do.
Currently Being ModeratedApr 12, 2012 1:14 AM (in response to jmwsys)Re: Variax 500 phantom power requirements
The info you are looking for might possibly be found here: http://www.epanorama.net/sff/Audio/Musical/Products/Line_6/Variax%20Service%20Manual.pdf
Currently Being ModeratedApr 12, 2012 3:58 AM (in response to johnnyayyy)Re: Variax 500 phantom power requirements
Thanks for that. Very useful. There is a note in the section that deals with the XPS A/B schematic which suggests that the XPS plus Variax is drawing 326mA @ 9 volts from the mains adaptor.
There is another note which says that the power output from the XPS to the Variax is between 7.027v and 7.06v for a nominal 7v supply. This tallys with other information I have seen. I also now know that the XPS mini supplies a little over 8v to the Variax.
Each type of Variax has its own slightly different power requirements, but I have seen enough reports from other people who have tried different combinations of PSU/Variax model to conclude that they all the instruments are happy running on the higher voltage that the XPS mini supplies.
All this suggests that a supply of 8v DC @ 400mA is OK for any Variax & will allow enough headroom to cope with the hungriest version.