Hey folks, I have someones unfinished amplifier project... It's a dual 4cx250 (or 150 or 350?) for HF. Looks like taps on the big inductor for 80, 40, 20, 15 and 10. It's well built, so instead of tearing it down for parts I'd like to maybe finish it. The guy I got it from said it was a design from the ARRL handbook but I'm not sure what year. I've searched a bunch of them and haven't found any HF amp using those tubes. Most of the amp designs for these tubes were for 6m/2m and 70cm. The amp chassis has the filament transformer and a 24v DC supply for the amphenol relays, I have a separate unrelated power supply I can use for the plate and screen. I was hoping an amp guru might be familiar with it and could tell me what year handbook to look for. If anyone has any ideas what year ARRL handbook might have the schematic and description I'd love to hear! Thanks!