UK made in the late 50s and early 60s. Checked codes in this batch are from 1961.
1950s vintage, larger, black wing plates, white label, and the yellow T decal with the Brimar name on the back of the tube.
The Yellow-T tubes are remarkable for their air, realism, and seductive warmth and unfortunately are getting as rare as the GEC A2900 tubes!
These are very similar to the famous Genalex/Gold Lion A2900 tubes. Upgrades any ECC81, 12AT7, 6201 and does replace the highest quality TFK ECC801S or GEC A2900.
NOTE: Not to mix up with later white T-logo tubes made in 1970s. These are nice tubes, but the Yellow T 6060 / CV4024 is the absolute top notch tube in the 12AT7 family.
