I recently bought a 5F1 circuit amp. The amp is a Joyo Sweet Baby, which is a 5F1 circuit that lacks the cathode bypass cap. The amp came with upgraded tung sol tubes and a Weber alnico. I thought it had the CVA8 but it turns out it’s the 8A100. I found the amp way too dark- to the point of almost muffled- with almost no available breakup. I did the C7 mod, which does the cathode bypass. That opened it up a little- helped it break up a little bit more, but it was still way too dark. I finally swapped the speaker, and behold! That’s the sound I wanted. I tried it with a 66 Jensen C8R and with a 64 Utah 8”, and both were amazing- exactly the champ sound I wanted. I think the Weber would go perfectly in a blackface champ, but it was not what I wanted in a tweed. Now the tough choice is between the Jensen and Utah. Both sound really good!