mab1376
1000+ Head-Fier
Hi mab 1376,
I have noticed that some of the 6DT6 tubes run hotter than others, both as pairs among different brands, and as individual tubes from the same brand. As a rule, after the initial burning in period the tube runs cooler. IMHO it does not not matter if one tube feels hotter than the other, as long long as there is no sonic difference.
Same thing about one tube glowing stronger than the other. Usually it is a function of how the internal parts were put together, and in one tube it may be more difficult to see the heater than in another. Unless the sound is effected, it does not matter.
How do you like the Raytheon 6DT6A tubes? The ones I have are made in Japan by Hitachi and sound best on the 2/7 strap setting. They also sound good unstrapped.
They are the Japan tubes, i'll try on 2-7 when i swap back to EF95, trying out my 6AV6 currently.