Slávek OK1TN has been producing tuning capacitors with plastic and ceramic fronts for many years, which are suitable for power stages, antenna tuners and the like. For example, a 23-420 pF tuning capacitor with 5 mm plate gaps costs €61 + €15 shipping.
The split capacitor 14 – 125 pF + 23 – 420 pF can also be interesting, which is only €4 more expensive. A tuning capacitor with a sheet spacing of 8 mm, which has a capacity of 23-180 pF, is suitable for high power output stages.
In addition to tuning capacitors, the OK1TN offer also includes variable inductances, so-called spools. A model with a capacity of 0.22 – 24 µH for a power of 2 kW costs €56 + shipping.