NTE provides an online and downloadable master cross-reference index. If you search for "2N3055," the guide will return "NTE130." You can find the master cross-reference in a massive PDF (often 50+ MB) available on the official NTE website or various tech manual archives.
Finding a replacement semiconductor using NTE documentation follows a streamlined process: NTE Semiconductors Cross Reference Guide nte semiconductors pdf
When downloading an NTE PDF, always check the revision date. NTE sometimes revises lead-free status or updates thermal resistance values. A PDF from 1998 might be outdated; look for a 2015+ revision. nte semiconductors pdf
(if you just need to know what the NTE PDF offers): nte semiconductors pdf