100 watt Hiwatt amplifier model DR 103 power supply schematic circuit diagram
100 watt Hiwatt amplifier model DR 103 power supply schematics, Hiwatt amp schematic diagram, electronic circuit diagram, Hiwatt amp schematics
12AX7 ECC83 Tube Data Sheet
12AX7 ECC83 Tube Spec Sheet circa 1969
1626 Tube Data Sheet
1626 Tube Spec Sheet