I've got a '64 Supro Thunderbolt, it's the model with a 15" Jensen, 2 6L6s and a tube rectifier. I haven't played it in a long time and powered it up today. Seems like it's not as loud as I recall, in fact my '55 5E3 Tweed Deluxe sounds significantly louder. I put some fresh 6L6 tubes in the Supro, but it's still not any louder. It does have a great vintage crunch to it though. I alays thought 6L6s were more powerful output-wise than 6V6s. Any thoughts on the loudness issue, could it be another tube or part? Thanks!!