Recently purchased a 940 on eBay. Love this radio! AM was unusable above a watt or 2. Learn more about the modification here... My 940 AM Webpage Simply a higher level collector modulation of the pre-driver on the RF board. I am making a PCBoard for those wishing to wire up and go. Classic audio circuit ...NO MAGIC. The mod results ~30 watts of carrier with plenty of modulation. I run mine at 10 watts into the amp. I'm on 7.290 AM with the group in the evenings if you want to hear the mod. Carl... Oh, I'll have pictures on the site later tonight 9/21 Pictures are there. The TS-930S has the same RF circuit so you could get the same results with that rig.