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You can switch back and forth between EL84s and your amplifier's original power tubes without rebiasing. Yellow Jackets also convert the power tube bias to "self-bias" Class A so that no bias adjustment is necessary. Additionally, most Yellow Jackets® converters will produce a substantial maximum power reduction (50% to 90%) making it easier to find that sweet, warm mix of preamp and power amp distortion at a lower volume. EL84s have a very tight and focused sound which has become world renown by their use in the British VOX™ AC30 guitar amplifiers. Yellow Jacket Tube Converter Technical InformationĬlose Why would I want to convert to EL84s using Yellow Jackets®?Įvery power tube type offers a different characteristic sound and feel.Spring Reverb Tanks Explained and Compared - Videos.Spring Reverb Tanks Explained and Compared.Spring Reverb Tanks Designation Calculator.Speaker Impedance, Power Handling and Wiring.Rangemaster Modification / Variant: Input Capacitor Switch.Potentiometers - Modifying Taper Interactive Example.PNP "Positive Ground" Pedal Considerations.Newmarket NKT275 White Dot Transistor Measurements.Moreschi Wah-Fuzz (A Gary Hurst Design) Pedal Teardown.LED Current Limiting Resistor Calculator.Guitar Pedal Jack and Footswitch Wiring.DIY Vibrato Shorting Plug for Blackface / Silverface Amps.Capacitance Value Calculator for Molded Mica.Can Capacitors - How CE Manufacturing Makes Them.Building Your Own Two Conductor Instrument Cable.Basic Electric Guitar Circuits 3: Switches and Output Jacks.Basic Electric Guitar Circuits 2: Potentiometers & Tone Capacitors.