Tube date codes
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Dswankey
Lunatic Member
Regarding the Philips ECC88 there's some info in link below however nothing with regards to dates
Also I'm pretty sure that is not a 4 it looks very much like ⊿ = factory code in this case Herleen, NL
The 7 might denote 1957
As for the Seimens, might try here
Also I'm pretty sure that is not a 4 it looks very much like ⊿ = factory code in this case Herleen, NL
The 7 might denote 1957
As for the Seimens, might try here
Last edited:
radioactive
tube gear fanatic
Thanks.
trobbins
Super Member
https://www.leradiodisophie.it/Download/PhilipsCodeListAB-v10.pdf
GA = ECC88
Agree that delta7 are factory and year in decade. D is likely month=April, and 1 may be week in that month.
GA = ECC88
Agree that delta7 are factory and year in decade. D is likely month=April, and 1 may be week in that month.
on siemens
most siemens E88CC and E188CC have an id tag with 2 or 3 pairs of characters. i dont recall if the ECC88 typucally use the tags. by tag i mean a small metal tag attached to the getter structure. the siemens munich sumbol is an equal sign with a vertical slash thru it. if the tube has a 6 character code and is siemens, the code with have the equal aign character. the 4-character codes dont have it.
for both 4- and 6- character codes the first two character gove the tube type A_ for E88CC, G_ for E188CC. i cant remember the code character for ECC88.
feel free to post multiple clear photos with out glare individual tube for further identification.
most siemens E88CC and E188CC have an id tag with 2 or 3 pairs of characters. i dont recall if the ECC88 typucally use the tags. by tag i mean a small metal tag attached to the getter structure. the siemens munich sumbol is an equal sign with a vertical slash thru it. if the tube has a 6 character code and is siemens, the code with have the equal aign character. the 4-character codes dont have it.
for both 4- and 6- character codes the first two character gove the tube type A_ for E88CC, G_ for E188CC. i cant remember the code character for ECC88.
feel free to post multiple clear photos with out glare individual tube for further identification.
Metal #tags were attached on Tungsram tubes. Siemens too ?
Aren't all UK + Euro tubes with four characters from the 1950s ? Five or six characters would be 1960s, right ?
Aren't all UK + Euro tubes with four characters from the 1950s ? Five or six characters would be 1960s, right ?
yep--2 characters. seems the higher up on the tube the newer production.
some tube types--eg E88CC, E188CC, perhaps others.
not necessarily. IIRC (which i may not), later period siemens tags are 4 characters early ones are 6.
im not sure how that works, but, fthe philips family of manufacturers and many licensed by philips used 2 lines of 3 characters in the 50s, 60s and 70s. ive seen one line of 4 characters but i cant recall the year. ive also seen 50s tubes with 5 characters, a line of 3 and a line of 2.
