Figure 8.1 Heater Connections Indicated By the Letter X. This figure shows a transformer and two tubes but nothing is connected. The transformer has a primary and two secondaries. One of the secondaries is labeled 6.3 V A C. Each side of this winding is connected to an arrow pointing to the right. The capitol letter X is in front of each arrow. The two tubes are a triode and a pentode. None of their elements are connected to anything except for the heaters. Lines from all four heater connections come straight down and connect to arrows. The capitol letter X is below each arrow. End verbal description.
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