Originally Posted by mordy
I believe that you have the Raytheon 6CG7/6FQ7 tube. How does it compare to the tubes you did a shootout on?
I was able to compare a US-made Raytheon 6CG7 to a US-made 1940s Raytheon VT-231/6SN7GT. After going back and forth several times, I was unable to discern any significant difference. Since it appears that these tubes have the same innards, I was not surprised. I should note that I do not possess a Japan-made Raytheon 6CG7, so I have no idea how it might compare....
Raytheon 6CG7 and 6SN7GT (Click to show)
Next, I compared the Raytheon VT-231 with the Holland E80CC. The reason I used the octal, rather than the 6CG7, was that it is much easier. I configured the socket to run the E80CC in 6-volt mode and, using a 6SN7 to 12AU7 adapter on the octal, swapping between tubes was simple and easy. Comparing the E80CC directly to the 6CG7 would have required that I adjust the voltage up, or down, every time.... too much of a hassle....
Anyway, I was quite surprised with what I heard. I have liked the Raytheon since I first heard it, and I still do. However, the Raytheon has a frequency bump in the mid bass region, adding a considerable bass presence to the sound. Unfortunately, this tends to give the bass kind of a "one-note" sound rather lacking in detail. And further, since the mid bass is front and center, the mids and treble are recessed more than I would prefer. On the positive side, the mids and treble actually sound quite linear, but again, the mid bass bump is problematic, IMHO.