Thanks. The DV came with the Telefunken driver tubes so trying these against the unmarked ones.

Well I thought this must be the place to ask questions about headphone amps but not a single bite.  

I recently acquired this amp and I am very impressed.  I am thinking about tube rolling and any other mods . I've looked at some threads on here but I'm not sure if all recommendations for the standard model are applicable to the SE. Could anyone suggest what I might try without spending too...