I have a Gries 40w with a Jensen Neo 100. It's make a progressively worsening farty-type distortion (now) at all volume levels. I replaced the entire tube complement with no change noted. The only tube I didn't have a replacement for was the rectifier 5AR4. I did have one of those Weber Copper Top Equivalents that I put in it's place. Made no difference. Could the speaker be blown? It's rated a lot higher wattage handling than my amp puts out. I haven't been pushing it hard at all recently. Lower volumes, in fact, as I've been sitting in front of the amp and playing instead of standing while recuperating from ankle surgery. Any other thoughts on what could be wrong? Debating popping for a new speaker vs. taking it in for service (a 6-hour roundtrip for me for drop-off and pick-up to Orlando.) As always, your help is always appreciated.