mordy
Headphoneus Supremus
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- Aug 8, 2010
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Nobody is going to contradict me on this lol - we just don't know, but here is an uneducated guess. Let's guess that the first letter is the month and the second the year. Going down the alphabet from Jan - Dec and skipping the letter I because it looks like 1, we end up with A through M. Starting again from N through Z S represents May.S
A
This is all that is on the tubes other than the Arcturus name and I am not even positive the top letter is S for sure as it is a bit worn.
Make the A 1940 and SA = May 1940.
I have a 6N7G Arcturus in the original observatory box:
The x-shaped micas are unique. The date code is N 4
R 4
Using the same formula as above, N = January and R = 1938. The truth is that R does not fit into the system, but 4 + 4 = 8. This tube came out in 1936 och Arcturus went bankrupt around 1942 so somewhere in the middle sound about right. I am pretty sure that this is not a rebranded tube because of the mica shape which I could not find elsewhere with 6N7G tubes.
But this is a 6C5 etc thread so back to that. Here is a 6C5MG AirCastle tube which I am sure was made by Arcturus in their Coronet series:
The display stand is included in the price.
https://www.ebay.com/itm/Aircastle-...976022?hash=item217cfe8616:g:sDYAAOSwKwZfqFg-
PS: Please don't take my dating excercise seriously - only intended as a humorous attempt to decipher the unknown.