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25th September 2011, 08:17 AM
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diyAudio Member
Join Date: Feb 2009
Location: Melbourne, Oz
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RCA Octagon dating
I have a pair of RCA 7027A. The black base has BZ code, which indicates May 1968 from:
http://mysite.verizon.net/tubetronic...TE%20CODES.pdf The reference by Ludwell Sibley also refers to a date code embedded in the octagon surrounding the type. The octagons on my valves have a break in a corner, and in a straight part, but the reference gives no further enlightenment on interpreting the octagon date code. I note that Jeff West hasn't come across the code crack (Dating old tubes...any tips? - Page 2 - The Gear Page). So maybe this is one of those mysteries never to be deciphered ?? Ciao, Tim |
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