Good Morning, To make this simple, I've narrowed my search to a single transformer. I'd like to purchase an 8 ohm to 5K ohm audio transformer. This will interface an 8 ohm speaker to a 6V6 tube in my HRO-5AT1. Perhaps the following values will help ID any of those unmarked xformers: 8 ohms: 1.28 mh 5K : 796.1 mh Thanks in advance. 73, Jim, WA2UMP