ProtoDAC TDA1387 X8 project

[hifinet]

I am not familiar with the Vishay part numbers. According to the linked datasheet, the one you linked is the correct type, but the value is too high. Series is VAR(Vishay Audio Resistor?). DigiKey never seems to have the correct values (or any at all) in stock. The value should not be greater than 430R. The value in the kit is 420R. They could probably be as low as 390R, but may need to have the C3/C4 caps increased a bit.

Alternate source of Z-foil is HiFiCollective in UK. They have Charcroft, which are also Vishay Z-foil. 390R 

In the near future, I will be trying some alternatives to the Vishay Z-foil resistors. Mentioned in some recent posts. SMD tantalum resistors, Rhopoint wire wound and Caddock TF020 thick film. The SMD tantalum would be significantly less expensive. They are  stocked in 100R by DigiKey. Vishay PTN, Stackpole RTAN and Yageo NT series.