Secondary:
**********

    d =   4 cm
    h =  25 cm (30 cm PVC form, ratio 6,25:1)
    N = 900
wired =   0,28 mm
wirel = 113 m
  RDC =  35 ohm
  RAC =  49 ohm

computed f0:     1,214 MHz
computed L:      4,760 mH
computed C:      3,609 pF
computed XL: 36315 ohm
estimated Q0:    55

measured f0:    1,260 MHz (no spark load/1,050 MHz with medium sparks)
measured Q:    30 (with 1cm sparks, 60 without sparks-from f resp.)
measured RDC:  29 ohm

Old primary:
************

    d = 12,0 cm
    h =  8,0 cm
    N =  4,5
wired =  3,5 mm
  RDC =  2,8 mohm

computed L: 2,14 uH (gives C = 10,7 nF)
Xl = Xc = 14,14 ohm (gives Rp at resonance = 424/848/3450 max)
computed coupling: k = 0.2

Old feedback:
*************

    d =  5 cm
    h =  1,6 cm
   N1 =  1
   N2 =  8
   N3 = 15
wired =  0,4 mm

New primary for VTTC:
*********************

    d = 11,0 cm
    h =  8,3 cm
    N = 18,33
wired =  2,26 mm
wirel =  6,34 m
  RDC =  0,027 ohm
  RAC =  0,260 ohm

computed L: 30,19 uH (gives C = 0,76 nF)
computed Q: 770
Xl = Xc = 199,2 ohm (gives Rp at resonance = 5976/11952/48605 max)
GU-81 calculated internal impedance Ri = 5000 ohm
(impedance matching results to +150% sparks length)
computed coupling: k = 0,235

New feedback for VTTC:
**********************

    d = 11,0 cm
    h =  2,1 cm
   N1 = 10
   N2 = 15
   N3 = 20
wired =  0,4 mm