4.1.9 Test Facilities
4.2 Power Supply Circuit Board
4.2.1 Mains Input
4.2.2 Power Transformer
4.2.3 5Y3 High Voltage Rectifier
4.2.4 OB2 Gas Discharge Tube
4.2.5 Bleeder Resistor
Section 5 Alignment and Maintenance
5.1 Gain Reduction Meter Zero
5.2 Internal Balance Test Switch
5.3 Balancing the 6BC8 Gain Reduction Stage
5.4 Balancing the Amplifier Stage
5.5 Noise and Distortion Tests
5.6 Frequency Response Tests
5.7 Hum and Microphonics
Section 6 Schematics and Drawings
6.1 Board Layouts and Schematics
6.2 Recall Sheet
Section 7 Support and Service
7.1 Service
7.2 Support
7.3 Replacement Parts
7.4 Warranty
7.5 Factory Service Instructions
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