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Philips Ecc186 (perfect measures) tubes are from the same batch as Philips Ecc82 ? Only differ inscription or differ and internal construction?
For example this Philips Ecc82
Code Ct3 Valvo is D getter short plate tube Ecc186?
Is there a right triangle in another line of code just beneath? These tubes were frequently labeled as the special 7316 also a sub for an ECC82 12AU7.
The code is Gf8 ∆8L1 .
Gf8 code Ecc82 .
∆ = Made in Heerlen/Holland
8L1 = Made 1968 in
So ecc186/7316 tubes are a special batch or a tube that ecc82 which perfect measuring ?
Sorry re late reply. These certainly have the right code no pun intended. The only concern is that 7316's were labeled as such for low noise operation in early computing and analytic gear etc. The other is that they were produced a bit earlier like 1958-1963 but not sure how far into the 60s. In any event they should be roughly equivalent for overall SQ so you have made a good score.
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