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https://diyparadise.com/w/wp-content/uploads/2008/06/ecc99el84c.gif633337Updating the Simple EL84 Matching the current is critical to sonics here. If you could find matched tubes, great. But over time, even matched tubes will age and most probably, they won’t be matched anymore. Therefore it’s critical to have some adjustment on the tube currents. There you have it! By varying the pot, we could adjust until both tubes are conducting the same current. Well, as close as you can get. Without too much effort, I managed to get one channel within 1mA while the other channel was within 5mA. If you have trouble getting