Use one octal tube and socket instead of three and the additional parts and labor required. It seems they could have just as easily done the same using a single 6SL7 (mu 70). The Eico HF-87 schematic that I posted uses a single 12AX7 (mu 100) as input to its 6SN7 driver / phase inverter section. The bean counters are most often accused of diminishing the quality of a design but in this case I wonder if they should have been given more influence than the designers. But doing so in a commercial product just cuts into profits. I sometimes add things to DIY builds just because I want to try them. It just seems like this aspect of the amp is over engineered, which is not something we usually associate with Chinese amps.ĭesigners usually claim added complexity has some benefit. The decision to add the cathode follower led to the decision to add the 6SN7 in the PS to eliminate the high grid voltage. If the following stage was hard to drive then the use of a cathode follower would solve the problem but, as far as I know, it's not difficult to drive. If it doesn't, why would they want to add one? Which is why I'm wondering if a cathode follower provides any sonic benefit or advantage when used in that position. By adding the cathode follower they created the "problem". Click to expand.As I see it, they had the "extra" triode, which is configured as a cathode follower, because they chose to add it.
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