I've also built and modded a few tube amps, hence the technical questions. I would appreciate the Helix much more if I actually knew what these controls do in terms of component emulation. I've bought a Helix recently and these controls imo are very important part of the power amp emulation. In a tube amp the secondary winding of the power transformer has significant resistance, so when the amp draws current, all the anode voltages of the amp drop or 'sag'. If that indeed excursion, my question is what component does this control emulate exactly?ĭoes this change the voltage swing of the phase inverter, maybe the coupling capacitors size, or grid resistors size?ĭoes this emulate the HV++, HV+ voltage drop with a resistors in series with the power supply when a large current is drawn? So BIAS value of 6-7 where most emulated class AB amps are set will result in 60%-70% of Tube wattage at idle, like real tube amps biased at? If the emulated tube wattage is 30W (6L6 for that matter), does changing BIAS between 0 to 10 changes the idle current from 0W to 30W at idle (full class B to full Class A)? If so, what range does this control have in terms of effective bias idle wattage? My question is whether this control changes the cathode resistance and changes the negative voltage on the grid of the power tube? I would like to know what Bias and Bias X controls do in terms of component emulation, beyond the general 'feel' descriptions I can already find.
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