Push-pull Tube coil First Light, Plate transformer.

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

Original poster: "David Sharpe by way of Terry Fritz <twftesla-at-qwest-dot-net>" <sccr4us-at-erols-dot-com>

Chad

1. What tubes are you running in push-pull?
2.  Input voltage, current, GLB values, etc. etc.

The first P-P machine I built was in 1971 while in college.  Used a pair

of 807 beam-power tubes.  Vbb was 750V+, SG ~ 300V.  Ibb was 150mA
Pinput was about 225W (750*2*.150).  With 30W per plate (plates barely
perceptably dull red), about 150-175W getting into tank.  Could get
about
a 2" brush discharge, virtually silent.  Tuned with a large 1000pf
variable
cap out of a WWII transmitter.  All parts for coil have gone to great
parts graveyard in the sky.  Was a p-p armstrong as yours and
fortunately (or luckily more like it) worked first crack out of barrel.

More recently (about 2-3 years ago) helped a colleague build a 600W RF
exciter for a IR laser using 6 807WA's (3 tubes in parallel, two banks
of
three in parallel in push pull).  Could push up to 750W input, would
still
get 1.5 to 2" discharge from resonator (but a lot of heat).  This
oscillator
was a p-p hartley oscillator, it came up likewise very easily.  Like
to see some JPEGs when available.  Good work...

Regards
Dave Sharpe, TCBOR
Chesterfield, VA. USA