Joined: Feb Mon 04, 2008 3:20 am Posts: 361 Location: Grand Rapids MI
Just ran across a little tiny eye tube made for Heath. The only markings are the Heath P/N 411-139 and a number which should be the tube number but doesn't cross to anything I have. Don't have time right now to post a picture but this thing is the size of a 7 pin mini tube, with a 7 pin mini plastic base, about as long as a 6GC7, 3/4" in diameter (approx.) and also has 1330 on the glass. There is one more marking that I can't read. What's really interesting is that this thing is NIB. Any thoughts out there??
Joined: Jul Sun 17, 2011 1:11 am Posts: 1788 Location: Los Angeles
The 6M-E5 and 6M-E10 look identical, and have the same pinout. The difference is that the 6M-E10 was designed to work with a lower 100V supply. I guess they formulated the phosphor to be brighter at the lower voltage (?).
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