DL4 distortion problem/ part II

["cameron street" <c.jas@optusnet.com.au>]

OK, i've tried the 2 DL4's separate from one another,
with and with out batteries, swapt power supply's.
my old DL4 is fine.  the new one distorts .
this is with out any effects running,  straight through.
I imagine there's nothing adjustable inside?
I have a fucked unit. 
Amazing these things don't show up in the shop, hey!
What next?