Hey folks, fledgling hobbyist amp tech here with my first dive into the wacky world of vintage tone. I picked up this craigslist-find blackface Bassman head for a reasonable price over the weekend. Owner believed it was a '67. Although it still had the original two-prong power cord, it recently had a cap job (including a fresh death cap!), and sounded fantastic when I tried it out. When I got home and pulled the chassis to swap in a grounded cord, I found a little surprise -- a fourth transformer! After poking around, I've deduced that the original power transformer was replaced with a Stancor PC-8422 at some point. BUT, there's another transformer tucked inside -- a tiny Stancor P-8610 with the green leads connecting to the rectifier board and chassis ground, and the black leads meeting up with the PT's primary at the fuse holder and power switch. Any idea what the purpose of this was? Should I rip it out track down a more 'stock' transformer?