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Page 83
10.2.1 Installing the Filament and Filament Jumper Wires
The filaments of the 2 6SH7 tubes are supplied with 6.3V by the 2 Grey Mains Secondary wires. The
issue we face is that we need to make 4 connections (2 for each tube) from the 2 Grey wires. To do this
we'll directly connect the 2 Grey wires to the filament pins of one of the 6SH7 valve bases and jumper
2 Grey (actually the color doesn't matter, but we'll use Grey) wires from there to the other 6SH7 valve
base. Ideally, we'd have liked to let printed circuit board traces do that, but it just didn't work out —
so we'll add jumpers.
The Mains Secondary wires and the jumpers will be connected from the underside of the board, but
this top view shows where we'll connect the 2 Grey Mains Secondary wires.
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