Took the machine apart replace all connecting wires with silver core, replaced all electrolytic caps with tantalum precision caps 1% at higher voltages touched all solder pads with high silver content solder (retinned). Put a new battery together "lithium" type more power longer battery life (regulated system). Boosted the output to bias 500mv & re-calibrated the machine.
Hung a coil of my design and the ground pounder was born.
The 4900 is kicking the butt of all my buddies with 1000+ plus machines.
It was fun & cheap to do.
I'm pretty busy now, but when I get a chance I'll post here the details.
autotune
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