У вашего броузера проблема в совместимости с HTML5
Fault
Amplifier powered up but no display indication.
DC supply voltages checked minus 14.6 volt supply missing.
R707 47 ohm Resistor open circuit, Q704 2SB1185 Short circuit, D702 15 Volt Zener short circuit.
After replacing the defective parts the Amplifier worked perfectly.