Analog Metric 2A3 User Manual page 4

FEATURES FEATURES
FEATURES FEATURES
• Four 2A3, two 6SN7, two 6SJ7, and one 5Z3P (5U4G) vacuum tubes.
• The input stage uses pentode 6SJ7 for pre-amplifying and the following stage uses
twin-triode 6SN7 for phase splitter.
• The output stage uses two 2A3 tube configured as push pull. Output power can reach
15W for each channel.
• Built-in tube (5Z3P/5U4G) and solid-state rectifier and regulation circuitry with two
inductors option in CLC filtering.
• Two single-end input and two single-end output.
• Input sensitivity: 1 Vrms
• Input impedance: 100KΩ
• Close loop voltage gain: 22dB
• Variable resistor trimmer to adjust plate currents of the output stage tubes.
• Support either open loop gain or close loop feedback.
• Symmetrical layout design in signal paths for both channels.
• Dedicated ground and power rails layout design.
• Two large reservoir decoupling capacitors for power rails.
• Power requirements: two 280V AC (100mA), two 6.3V AC (1.5A), two 2.5V AC
(5A), and 5V AC (3.5A)
• Requires two 15W output push-push transformers with primary winding 3KΩ to
secondary winding 4/8Ω impedance transformation.
• PCB dimension: 198mm (W) x 330mm (L)
• PCB thickness: 2.4mm, double layer, 2oz copper.
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2A3 Push-Pull Push-Pull Tube Tube Amplifier
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Analog Analog Metric Metric
Analog Analog Metric Metric