6BM8 - ECL82 - 6GW8

6BM8 - ECL82 - 6GW8

The 6BM8 (aka ECL82) and 6GW8 (aka ECL86) are similar but different tubes. They are half half power tube, half preamp tube and were made for their compact design. They are usually interchangeable though it is not advised because they are in similar supply and of similar price.