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In Reply to: RE: Mystery 12AU7 = RFT posted by Thermionic27609 on June 30, 2009 at 20:33:08
David
The dates would reveal July 1951 and Sept 1951.Amperex could be made in germany or Holland but the other would be a Mullard.Are there creases in the top of the tubes.
If the power supply waveform isn't pretty,neither is the sound in most cases.
I would read those dats as 1967 ('77?), week 51 and '69 (or '79) week 51. HP labeled those codes, so manufacture date will be a little earlier - any etched codes?
Have not seen 1951 Amperex or Mullard ECC82 so far.
Not likely
I agree but those dates you gave would indicate that.Do you have the actual tubes in front of you?.I have never known the europeans to use date codes the way used to with the last two digits being the year.
If the power supply waveform isn't pretty,neither is the sound in most cases.
Edits: 06/30/09
I was under the impression that Philips was the first to make the ECC8X series tubes in Europe & they didn't start-up until the mid-1950's. My earliest ECC82 are some Mullard ECC82 dated the usual Philips/Mullard way to around 1958.
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