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08-18-2023, 08:20 PM
Hi Guys
This seems like a multip-part question, or maybe the actual Q is not defined? It would be helpful to have specifics about the transformers in question, and the circuit goal.
As far as mixing tube and solid-state rectification goes, TUT2 showed some example circuits. Dual-rectifier tubes form a half bridge that can take in AC and produce the positive end of a DC output. You can use solid-state diodes to form the negative output side of the bridge.
An alternative is to use solid-state for the main bridge, then use the dual rectifier in series with the positive output. A 3-way switch can allow for straight-SS, one tube rectifier, or 2-tube diodes in parallel. This gives you highest-voltage, most saggy and medium sag outputs, respectively.
The ultimate regulation and thus sag is determined by the PT, with contributions by the tube rectifiers.
You can generate a low-voltage from a high-voltage, or a high-voltage from a lower voltage, by using an auxiliary PT to do that directly from the mains, or as a back-to-back connection from the main PT. I do this in my preamps and hybrid PAs. If the main-PT sags under load, the cascaded PT outputs will also sag, which you can either tolerate and make useful, or accommodate by regulating the down-stream DC outputs.
This seems like a multip-part question, or maybe the actual Q is not defined? It would be helpful to have specifics about the transformers in question, and the circuit goal.
As far as mixing tube and solid-state rectification goes, TUT2 showed some example circuits. Dual-rectifier tubes form a half bridge that can take in AC and produce the positive end of a DC output. You can use solid-state diodes to form the negative output side of the bridge.
An alternative is to use solid-state for the main bridge, then use the dual rectifier in series with the positive output. A 3-way switch can allow for straight-SS, one tube rectifier, or 2-tube diodes in parallel. This gives you highest-voltage, most saggy and medium sag outputs, respectively.
The ultimate regulation and thus sag is determined by the PT, with contributions by the tube rectifiers.
You can generate a low-voltage from a high-voltage, or a high-voltage from a lower voltage, by using an auxiliary PT to do that directly from the mains, or as a back-to-back connection from the main PT. I do this in my preamps and hybrid PAs. If the main-PT sags under load, the cascaded PT outputs will also sag, which you can either tolerate and make useful, or accommodate by regulating the down-stream DC outputs.
