Schematic Tube Preamp

Are this transformers usable (z primary 5-20k / z secondary 12.5-50k) The “universal” preamp Secondary 20k transformers 50k usable primary

Are this Transformers usable (Z primary 5-20K / Z secondary 12.5-50k)

6 tube stereo pre Tube stereo pre amplifier preamp schematics audio power valve vacuum transformer radios circuits electronic secondary list 5a 500v 117v ct Preamp schematic universal tube 12ax7 phono circuit supply power 4s bias simple tubes cascade reyhan

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The “Universal” Preamp | Cascade Tubes

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Are this Transformers usable (Z primary 5-20K / Z secondary 12.5-50k)

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6 Tube Stereo Pre