Gio writes –
Bruce’s latest project is an EL84 Push-Pull Tube Amplifier. LM317 Regulators are used for constant current sources (CCS) to set the bias of the output stage. It is interesting to see a modern semiconductor combine with vacuum tube technology.
ECC802S SRPP / EL84 (6BQ5) Push-Pull Tube Amplifier – Link.
2 thoughts on “ECC802S SRPP / EL84 (6BQ5) Push-Pull tube amplifier”
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The proble you had with this amp, the voltage issue.
You could solve this, even though you already did, by delaying the relay that triggers B+
This way, your tubes can get up to temp. before the hi voltage nails them.
I use 2 6DM4 rectifiers in all my projects because of the time delay they have.
My tubes get hot before the hi voltage hits them, and the B+ rises slowly in comparison.