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04-27-2023, 01:15 PM
Hi Guys
There are a number of similar-seeming 2-triode splitters that might all be loosely referred to as "see-saws".
In TUT Fig..6-11, the first figure shows two independent gain stages where the first stage drives one output tube and also a voltage divider. The voltage divider feeds the second stage to drive the other side of a push-pull output stage. There, the voltage divider is specified to match the free-running gain of the second stage - pretty chancy.
In the context of the single-knob Power Scale solution, a pot sect can be placed at the output of the first stage which would feed both its side of the power stage and the voltage divider. The latter would have to be comprised of high-value resistors to not alter the sweep of the pot too much.
The right-hand figure uses a free-running stage to drive one output tube and to drive a feedback-controlled inverter stage. The inverter has a gain of -1 and drives the second half of the output stage.related This circuit is intended to provide accurate signal amplitudes to the output tubes. Again, half the PS pot can be used at the output of the first stage, driving both its related power tube grid and the input to the inverter stage. To not alter the pot sweep too much, the gain-set resistors for the inverter have to be quite high.
Any variations of splitter design where the stages are interconnected at the cathode will require a 2-section pot for the drive compensation function unless a single-section is used ahead of the entire circuit.
Have fun
There are a number of similar-seeming 2-triode splitters that might all be loosely referred to as "see-saws".
In TUT Fig..6-11, the first figure shows two independent gain stages where the first stage drives one output tube and also a voltage divider. The voltage divider feeds the second stage to drive the other side of a push-pull output stage. There, the voltage divider is specified to match the free-running gain of the second stage - pretty chancy.
In the context of the single-knob Power Scale solution, a pot sect can be placed at the output of the first stage which would feed both its side of the power stage and the voltage divider. The latter would have to be comprised of high-value resistors to not alter the sweep of the pot too much.
The right-hand figure uses a free-running stage to drive one output tube and to drive a feedback-controlled inverter stage. The inverter has a gain of -1 and drives the second half of the output stage.related This circuit is intended to provide accurate signal amplitudes to the output tubes. Again, half the PS pot can be used at the output of the first stage, driving both its related power tube grid and the input to the inverter stage. To not alter the pot sweep too much, the gain-set resistors for the inverter have to be quite high.
Any variations of splitter design where the stages are interconnected at the cathode will require a 2-section pot for the drive compensation function unless a single-section is used ahead of the entire circuit.
Have fun
