Yeah, probably you are right, Charles. But it is still quite remarkable I think. Jens

On 10/4/2017 7:55 PM, Charles MacDonald wrote:
On 17-10-04 04:37 PM, Tomasz Kowalczyk wrote:
I think there are no known (to the internet) tubes in that series other than standard -,+,~ tubes. I don't know why no one decided to throw extra symbols in the existing tubes or nobody made an extra tube -

some makers did offer to make "special symbol" tubes on a private order basis, but that would have meant the customer (equipment maker) would be in charge of supporting replacements for their customers.  Much easier to stick some Ne-2 Lamps behind a bezel with captions.


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