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Guitar preamp tone explained The “universal” preamp Tube stereo pre amplifier preamp schematics audio power valve vacuum transformer radios electronic secondary list 5a circuits 500v 117v ct
Are this transformers usable (z primary 5-20k / z secondary 12.5-50k)Secondary 20k usable 50k transformers primary .
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Guitar Preamp Tone Explained - Effectrode
StompBoXed - The Guitar Pedal Builders Repository: 12AU7 Tube / Tubed
6 Tube Stereo Pre
Are this Transformers usable (Z primary 5-20K / Z secondary 12.5-50k)