Transformers usable 20k secondary 50k primary 6 tube stereo pre Are this transformers usable (z primary 5-20k / z secondary 12.5-50k)
Guitar Preamp Tone Explained - Effectrode
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Guitar preamp tone explained
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StompBoXed - The Guitar Pedal Builders Repository: 12AU7 Tube / Tubed
6 Tube Stereo Pre
Guitar Preamp Tone Explained - Effectrode