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How to identify unmarked vacuum tubes (European)

If you pick up batches of used vacuum tubes from time to time, you probably end up with quite a collection of vacuum tubes with unreadable or missing markings. Over time I've developed some methods to identify these tubes with a fairly high success rate. Note: I mainly focus on European tubes in this video 00:00 Introduction 03:08 Using the type code 21:40 Identifying internal tube elements 33:15 Identifying the heater 42:51 Exhaustive example of identifying a tube 1:05:02 Outro Philips-Mullard Factory Valve Codes: https://frank.pocnet.net/other/Philip... WARNING: Do not attempt to repair electronic equipment if you don't know what you're doing. If you want go get access to more behind the scenes content, consider joining Club RTR:    / @retro_tech   If you enjoy my content, consider buying me a coffee: https://www.buymeacoffee.com/retrotech Music by Karl Casey @ White Bat Audio Noise video footage by Milan Matos Electrocution logo by Nesdon Booth, The Noun Project