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WebJan 25, 2024 · 280 indicates Raytheon. Further, 64 could indicate 1964, but browsing through the web I came across the opinion that "3K" refers to 1963 ("K" is a week or month). Finally, what can be said about the actual manufacturer? Usually on internet forums, Baldwin Raytheon Japan tubes are attributed to Toshiba. http://www.jacmusic.com/nos/5687/5687-Index.html WebFind many great new & used options and get the best deals for Vintage Raytheon Electronic Tubes - (5) 8CN7 Tubes - NOS in boxes MCM015 at the best online prices at eBay! Free shipping for many products! nourishing probiotic gel cream