Hi Carsten Assuming you have the circuit diagram for the tuning unit, C1, C2, C4 - 110 mmf vacuum variable. C3 - 750 mmf vacuum variable. C5 - 150 mmf air variable. C6, C7 - 0.0011 mf 5 kv micas Sangamo type F-2 or equiv. K1, K2, K3 - D.p.d.t relay v.a.c. coil. Ameco type 51 or eqiv. Good luck. 73, Ken ZL1AIH