Wish Power Tube Type + HF and LF Resonance and Q interactivity

GreatGreen

Power User
According to Cliff's article about the differences between power tube types, those differences mostly present themselves in the form of what the impedance curve ends up looking like when plugged into a given guitar cab. For example, EL34's will have a higher damping factor than 6L6's so the impedance curve will be less dramatic than the curve generated by a 6L6 poweramp into the same cab, etc.

What if each tube type was given a relative additive or subtractive value of HF Resonance, HF Q, LF Resonance, and LF Q? This could help more accurately simulate the effect of changing power tube types.

In other words, all other things being equal, a 6L6 power section has less damping than an EL34 power section, so the natural HF Resonance and LF Resonance of a 6L6 amp will be greater than the same amp with an EL34 power section, right? So if you're using an amp model with EL34 tubes and you select "6L6GC" power tubes, the system would, say, increase the LF Resonance and HF Resonance values by +2 in the speaker page (or whatever those relative values would actually be) to properly simulate the new impedance curve of the now-6L6 poweramp.

Basically, to implement this you could designate one of the power tube types to represent the "normalized" impedance curve of all the cabs, then setup the impedance curve in the Speaker tab of the amp block to change based on whatever other power tube type you select.

EL34 (normalized):
LF Res +0 to default value of LF Res per selected cab in Speaker tab
HF Res +0 to default value of HF Res per selected cab in Speaker tab

Select 6L6GC tube type:
LF Res +2 to default value of LF Res per selected cab in Speaker tab
HF Res +2 to default value of HF Res per selected cab in Speaker tab

Select 6650 tube type:
LF Res +3 to default value of LF Res per selected cab in Speaker tab
HF Res +2 to default value of HF Res per selected cab in Speaker tab

...and so on. I'm not saying these numbers are accurate, but you get the idea. Establish a "normalized" impedance curve with a given power tube type, then if another power tube type is selected, add or subtract accordingly to the adjustable parameters in the Speaker tab of the Amp block.

Also, manual adjustments to any of the values in the Speaker tab should change the selected tube type to "Custom" or "User Defined" or something like that.
 
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