The IRF510 and 2N2218 is not available here in INDONESIA,
-Could you suggest an alternative for 'linear amplifier module' ?
-Can I just use:
HF BANDS QRP LINEAR AMPLIFIER - 4WATT or
TEN WATT LINEAR AMPLIFIER all by Harry Lythall - SM0VPO
Since 2SC.....( Japanese) transistors are available here.
-What module ( coil, capacitor, x-tals) to change if need another band say 10MHz ?