Vaccum Tube Elektor

• 1984 November: Ten Watt Valve Amplifier With Just Four Valves
• 2001 May
• 2003 April
• 2003 May
• 2003 September
• 2003 Oct Valves at low plate voltages 2nd part

• PL504 at 24V driving loudspeaker

• Transformer: Mains, 230V/24V
• Loudspeaker 8 Ohm
• Heater 300mA @ 27V