Final analog implementation

The final schematics are given below:

The value and type of the components are:

  Rs = 150 ohm, Beyschlag, metalfilm
  Rd = 680 // 150 ohm (in parallel), Beyschlag, metalfilm
  Rk = 330 ohm, Beyschlag, metalfilm (100 ohm for 6N1P). 
  Ra = 2 x 47kohm (in parallel), Beyschlag, metalfilm
  C1 = C2 = 39nF, paper-in-oil
  Co = 0.47µF, paper-in-oil
  Ck = 2 x 470µF/16V (Philips)
  L1 = 1 mH, HF-choke (brand unknown, but sonically important).
  tube = E88CC, Golden Dragon (Svetlana 6N1P is a superiour replacement!).