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I have had 2 pair in their original box Mullard labeled Amperex all with the VR* etched codes.....my question is did *all* E188CC tubes manufactured by Amperex have the VR* code? I just picked up another pair of Mullard labeled Amperex and both are (Delta 9B2) but neither have the VR* code above the Delta code.....Just curious if there were true E188CC with both etched codes? Thanks in advance for any help!
Follow Ups:
We've seen that once in a while, often within the same lot of 100 tubes. Don't think it was intentional. Just speculating that it was misalignment of tubes in the manufacturing process. Sometimes the etched codes impressions are poor closer to the bottom curvature of the glass.It is just a guess. Others with more experience may have better insight.
Sorry the question should read........Just curious if there were true Amperex E188CC ever manufactured *without* both etched codes, just haveing the Delta codes only?
Yes, in theory, every 7308 made by Philips should have the VR in the first line of etched codes. VR is the Philips manufacturing code for a 7308/E188CC. My supposition is that the * must have been the original version of the tube, as a numeral following the VR was supposed to signify subsequent manufacturing design revisions. That supposition could be wrong, however. I'm not 100% sure at what point Philips switched the second line of code to four characters rather than three (@ 1964?), but my guess is that you have Heerlen made tubes from 1969, February, second week. It may be that by that time they were no longer revising the design, thus no need to keep track ... and no need for the first line of code.
Thanks for the reply......the four that I do have in their original box and unused have the complete codes as VR6 Delta5G2 and all four tubes have those exact same batch numbers etched on all four tubes. I just found it curious that the recent pair I have bought do not have the VR* designation. Another curious aspect to one of the new tubes is that although the internal constructions are identical to each other and to the quad I have owned, one tube of the new pair has the ring getter/splash guard attched to the top plates 180 degrees out from the other tubes? Kinda strange.......
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