VAR-Series "naked" Z-FOIL RESISTOR
(aka. Texas Components TX2575 or Charcroft Electronics CAR Series)
0.4 Watt; TCR of ± 0.2 ppm/°C; Tolerance of 1 %; Noise < - 40 dB
These are the very best Vishay resistors made for audio...in fact, they are the highest technology resistors on the planet ! In their short 18 month existence, they have gained quite a reputation for neutrality, resolution, low level detail, etc...
Product Info Data Sheet - PDF