LC31 Link coupler
The link coupler is tuned to your plasma tube and transfers the energy from the PA3 amplifier to the electrodes on the plasma tube.
For PT tube: LC31S, $ 85
For ST tube, LC31P, $ 85
For BAT tube, LC31TCBA, $ 85
It is required to cool the LC31 coupler with a fan on power levels of 100 watts or more. Which means a fan is recommended for ST plasma tube for more than 75 volts, and required for the BAT tube, regardless of voltage setting.
EW Tube electrodes
The EW tube electrodes are clamped loosely on the tube, close to each end of the plasma tube. The electrodes are prewired and it is not recommended to extend the wire length. The wire limits how far the LC31 coupler can be placed from the tube electrodes.
For PT tube: E1W, $ 28
For ST tube, E2W, $ 33
For BAT tube, E4W, $ 38
RG-213 cable
You need a 24 foot/7.35 metre RG-213 cable between the PA3 and the LC31 link coupler. This is minimum length and part of the tuning, do not shorten or substitute for other cable.
It is recommended that the cable is a little longer, as it can be a bit tricky to remove the insulation on the ends. It will leave you some extra in case you need to do it twice. Longer than 24 foot/7.35 metres is a lot better than too short.
Also, if you are using plugs and sockets instead of plugging straight into the PA3, you’ll likely need a little extra as well. See this page.
RG-213 cable can be ordered from Spektrotek or from Farnell/Newark (part #: 2425425).
Other parts from Spektrotek
If you’re anything like me, you’ll probably make a mistake somewhere in the process. Having these spare parts means you can get back on track quicker if you make a mistake and a overheated component is the result.
These items can be sourced from Spektrotek, from local supplier or Farnell/Newark.
Spare STW20NK50Z: $6.25 per unit from Spektrotek (Newark/Farnell)
Spare IRF730 $2.50 per unit from Spektrotek (Newark/Farnell)