Several years since the 25watt beast was used owing to house move , but now building a small O gauge layout, and I find that the bit isn't as hot as it used to be. Now, at my age, I'm not as hot either, but I was wondering if irons, or bits deteriorate with age and usage. When soldering points, melting normal everyday solder on copperclad strip was slow. I use liquid flux and Carrs solder - cant remember which one, but I never had any problems 4 years ago, even when building a loco.
Regards ZD