Here’s a good pair of 1959 Amperex La Radiotechnique / Chartres France. 6BL8 ECF80 Preamp Tubes.
Item Tag: Amperex
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One Amperex Graphite Plate 830 VT-51 / 841 TESTED
Tested tube with a min of 25 and test result 60 Check my other tubes
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Two Amperex SQ 7308 Amplitrex tested-gold pin-very strong-Noise tested-read
These two Amperex 7308 are very strong. These sound significantly better than the tubes made 10 years later and labeled 6DJ8. These were tested on B&K 650 (the best good-bad tester ever made) and my Amplitrex.