[klondike98]

Can't answer your 77 tube question but can tell you the bakelite block caps are not all that hard to stuff. Here's a thread showing how. The bypass cap can looks similar to one in a 60MB I'm working on. I was able to bend the metal tabs on one end, slide out the caps which were in a tar block but had a piece of fish paper around it so it just slid out. Then stuffed new caps in the can and closed it up. Don't know if the one in the 19 is the same though.