my Tecsun PL660 - Defective?
 

hi. i recently bought a pl660, but it seems to be defective.
because when the BFO knob for SSB is turned clockwise (+ side) about 3/4 in the radio goes completely silent. and the LW is off by about 5 kHz.
is this normal?
another thing: i have read (in reviews) that the 2 screws inside the battery compartment
come sealed with stickers (for the warranty), but my unit does not!
does somebody own one and did it come sealed like that?

i hope this is the right place to ask.
any help is appreciated! thanks