VTTC output

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Herwig Roscher by way of Terry Fritz <twftesla-at-uswest-dot-net>" <herwig.roscher-at-gmx.de>


Hi all,

Trying to maximize the output of my system, I'm wondering what 
the best methode could be. Pure observation by eye IMO is not 
exact enough, especially at daylight conditions. Is monitoring the 
value of the current flowing into the base of the secondary a better 
choice? Which methodes do you use?

Some data of my system (please use constant distance font):
tube            : 4PR1000
plate           : 10 kV filtered dc
screen grid     : up to 1000 V
primary L       : 67 turns on 8" form
primary C       : 714 pF
secondary L     : 1370 turns on 4" form
secondary C     : toroid/corona shield 1.18" x 6"
sense resistor  : 5.1 Ohms between base of                         
secondary and GND
coupling        : secondary 1.2" above primary
grid coil       : 8 turns on 8" form, 1.2" below primary
grid leak R     : 30 kOhm
grid leak C     : 3.7 nF

grid current    : 10.6 mA
grid voltage    : 320 V
sense voltage   : 20 Vpp, sinusodial (!) 

The brush is about 15"long and very intensive blue, starting from a 
horizontal piece of rectangular aluminum sheet atop the toroid. 
Reason: The toroid is made from foam and covered with aluminum 
foil. Using a small discharge pin caused overheating and burned 
the toroid. I'd better made it from copper tube!

Could I expect more output? At present primary (about AWG 15) 
and secondary (about AWG 26) barely get warm. Much space for 
improvements?!?

Any advice is appretiated very much.

Herwig