Hi Paul,
FWIW the Service Scope series first used the new logo in the Aug 1967 issue. The 1966 catalog still shows the new announced 'scopes with the old logo. On the other hand I have several manuals (up)dating before end 1964 while the new logo appears at the cover. All my three 564s have the new logo on the CRT while the newest 'scope is from 1964. The fronts and the main transformers still have the old logo. The CRTs might have been replaced, who knows. The lowest number is 14843 10-2, whatever the meaning is.
I think the logo type has been discussed here but apart from a remark by Dennis and a logo picture in the Photos section I couldn't find it.
Albert
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Interesting. Now that you got me thinking about it, I noticed one other important difference: The original CRT has a round CRT in the logo, and the replacement has a square CRT in the logo (confirming my suspicion that the replacement is newer).
I didn't see those markings echoed anywhere else on the tube, but there is an embossed label toward the front of the CRT (visible only when removed).
Old = '12 A 5'
New = '503 B 59'
Anyone know when the official logo cross-over happened?
