On Fri, 01 Jul 2011 11:53:24 +1000, Phil Allison wrote:

"Wild Bull**** Artist


A proper step-down isolating transformer (not auto transformer buck
types) would allow 120VAC operation, just the way it was made. Amp and
guitar isolated.

** But that is NOT how such amps work in the USA.

http://www.webphix.com/schematic%20h...ticheaven.com/
fenderamps/twin_reverb_ab763_schem.pdf

Note the switch and the 0.047uF cap in the AC line to the amp - this
is the " polarity switch" and it connects the chassis to one or other
side of the AC supply via the cap. Users are meant to select the less
noisy position, which equates to the neutral conductor.

To duplicate this set up , the isolation stepdown tranny must have one
side of its secondary linked to the supply ground.

The only thing left " un-American " then is the frequency of 50Hz -
which WILL cause the power tranny to get rather hot.


As long as the users of the amp don't plug in any line-operated
accessories/equipment (patch to mixers etc) the amp should operate
flawlessly.

** It will work fine even with them - you posturing ass.


Any accessories (pedals etc) added between the guitar and amp should be
battery powered only.
Battery only.
No exceptions.

** Total lunacy.

The amp will always be safer if the chassis is grounded.


So.. a 5-6A? capacity (see the amp's fuse rating)


** A 300VA isolation stepdown tranny would be plenty.


.... Phil

Why be a prick? Are your Ewes not in heat?





--
Live Fast Die Young, Leave A Pretty Corpse