Hi Gang!!

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??

Me again!
Just want to clarify: This thing LOOKS just like a tiny 6E5 or 6U5. Target is round and on the end of the tube. It's not an the side.

That and the 6M-E10 were Japanese eye tubes.

The type is in fact 6M-E5. A fellow regularly lists NOS pairs on eBay. I purchased a pair and they are as described.

http://www.ebay.com/itm/Eye-tubes-Displ ... 3f18ee95c9

Norman

Well, ain't that COOL! Now it makes me wonder WHAT Heath was putting them in, since there is a Heath number as well. Anybody got any docs for this thing?

I believe Heathkit was using these indicator tubes in tape recorders.

Norman

Heath had an FM table radio that used one...

I have a pair of these that came out of an EICo 2400 tape deck.

Heathkit used them in their AJ11 AM-FM stereo tuner. This tuner had separate AM and FM sections for AM-FM stereo, before multiplex, and had separate tuning eyes for the AM and FM.

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 (?).