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Analog Metric 2A3 User Manual
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Analog Metric 2A3 User Manual

Push-pull tube amplifier
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2A3
2A3
Push-Pull
Push-Pull
2A3
2A3 Push-Pull
Push-Pull Tube
User
User
Manual
Manual
User

User Manual

Manual
Analog
Analog
Metric
Metric
Analog
Analog Metric
Metric
www.analogmetric.com
Tube
Tube
Tube Amplifier
www.analogmetric.com
sales@analogmetric.com
Copyright© 2009 All Rights Reserved
Amplifier
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Summary of Contents for Analog Metric 2A3

  • Page 1: User Manual

    Push-Pull Push-Pull Tube Tube Amplifier Amplifier 2A3 Push-Pull Push-Pull Tube Tube Amplifier Amplifier User User Manual Manual User User Manual Manual Analog Analog Metric Metric Analog Analog Metric Metric www.analogmetric.com sales@analogmetric.com Copyright© 2009 All Rights Reserved www.analogmetric.com...
  • Page 2 INTRODUCTION INTRODUCTION This kit employs commonly used triode 2A3 vacuum tubes in push-pull configuration. The first two stages uses pentode 6SJ7 (6J8P) for pre-amplifying and twin-triode 6SN7 tubes for phase splitter. The AC voltage is rectified by 5U4G/5Z3P rectifier tube. The output power can reach 15W for each channel.
  • Page 3 [ [ [ [ 2A3 Push-Pull Push-Pull Tube Tube Amplifier Amplifier Amplifier] ] ] ] Analog Analog Metric Metric 2A3 Push-Pull Push-Pull Tube Tube Amplifier Analog Analog Metric Metric www.analogmetric.com...
  • Page 4 • 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.
  • Page 5 C10, C11, C18, and C19). There are no polarities of the thin film capacitors. Also, notice the direction of rectifier diodes D11 and D21. 2. Without plugging the tubes 6J8, 6SN7, and 2A3 tubes. Only plug the 5Z3P/5U4G tube to the board. Apply power supply to the board, i.e. one 280V AC (100mA) to connector JA and 5V AC (3.5A) to JB.
  • Page 6 Metric 5. If no any abnormal events, turn off the power and wait several minutes for capacitive discharging. Then plug in two delicate 2A3 tubes and connect the output transformer as following block diagrams, either open-loop or negative feedback. Turn on the power again. Adjust the plate current by the 1W resistor trimmer VR1 or VR2 so that the plate voltage of the tubes are the same (voltage at first pin and third pin of J2A/J2B are the same).
  • Page 7 [ [ [ [ 2A3 Push-Pull Push-Pull Tube Tube Amplifier Amplifier Amplifier] ] ] ] Analog Analog Metric Metric 2A3 Push-Pull Push-Pull Tube Tube Amplifier Analog Analog Metric Metric 6. Do the same procedure as above for another channel. 7. For negative feedback, connect the one terminal of secondary windings to the connectors marked with "FBR", respectively.
  • Page 8 [ [ [ [ 2A3 Push-Pull Push-Pull Tube Tube Amplifier Amplifier Amplifier] ] ] ] Analog Analog Metric Metric 2A3 Push-Pull Push-Pull Tube Tube Amplifier Analog Analog Metric Metric www.analogmetric.com...
  • Page 9 4. The supply voltages at connectors one 280V AC (100mA), two 6.3V AC (1.5A), two 2.5V AC (5A), and 5V AC (3.5A). 5. Proper connecting of output transformers. 6. Proper mounting 2A3 tubes to socket. If you have any problem in assembly, please contact us by email to tech@analogmetric.com...
  • Page 10 [ [ [ [ 2A3 Push-Pull Push-Pull Tube Tube Amplifier Amplifier Amplifier] ] ] ] Analog Analog Metric Metric 2A3 Push-Pull Push-Pull Tube Tube Amplifier Analog Analog Metric Metric www.analogmetric.com...
  • Page 11 [ [ [ [ 2A3 Push-Pull Push-Pull Tube Tube Amplifier Amplifier Amplifier] ] ] ] Analog Analog Metric Metric 2A3 Push-Pull Push-Pull Tube Tube Amplifier Analog Analog Metric Metric www.analogmetric.com...
  • Page 12 Analog Metric Analog Metric Analog Analog Metric Metric Push Push Push- - - - Pull Pull Pull Amplifier Amplifier 2A3 Push Pull Amplifier Amplifier Components Components Value Value Quantity Quantity Remark Remark Components Components Value Value Quantity Quantity Remark Remark C1A, C1B 0.47uF/200V...