22 October 2007

EL84 Push Pull Tube Amplifier

Bruce's latest project, called the "OddWatt" is the EL84/6BQ5 Push-Pull Tube Amplifier shown below.

ECC802S SRPP / EL84 (6BQ5) Push-Pull Tube Amplifier
The driver stage is an SRPP circuit with ECC802S tubes, while ultra linear operation is used for the output stage with Sovtek EL84 tubes. LM317 Regulators are used to produce a constant current source (CCS) to set the bias of the output stage. The power and output transformers are from Edcor. 12VDC from a SMPS is used for the tube heater supply.

Bruce reports that performance from this amplifier is excellent. The low end extension is clean but not excessive. As expected, it has the characteristic tube warmth and is very easy to listen to.

DIY ECC802S SRPP / EL84 CCS Push-Pull Tube Amp Project
For additional information, pictures and schematics, see the complete page of Bruce's EL84 Push-Pull Tube Amplifier Project.

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