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Valves / Vacuum Tubes
Preamp/phase inverter simulation in LTSpice
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<blockquote data-quote="Ufudu" data-source="post: 930835" data-attributes="member: 16901"><p>Here is a model I created a few years ago for a JJ ECC83. This uses the Koren triode model (the one you are using may be different):</p><p></p><p><a href="https://postimages.org/" target="_blank"><img src="https://i.postimg.cc/NjK0vHn0/Screenshot-from-2019-06-13-09-56-09.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p>You can see at the end of the subcircuit file D3 and R1 define a series diode and resistor between grid (node 2) and cathode (node 3). </p><p></p><p>R1 = 2k, and the diode is defined by the .MODEL DX statement, having a saturation current IS = 1nA, this represents quite a "large" diode that will conduct about 1uA at 0.17V forward bias and 300mA at 0.5V!</p><p></p><p>In general, large signal analysis at the extremes of the tube's normal operating range will deviate more from real life, as the model accuracy becomes poorer.</p><p></p><p>But do not let any of this discourage you from using Spice. It is a great tool, particularly if you are interested in trends (what-if type improvements) that will help optimise the circuit before committing to breadboard.</p></blockquote><p></p>
[QUOTE="Ufudu, post: 930835, member: 16901"] Here is a model I created a few years ago for a JJ ECC83. This uses the Koren triode model (the one you are using may be different): [url=https://postimages.org/][IMG]https://i.postimg.cc/NjK0vHn0/Screenshot-from-2019-06-13-09-56-09.png[/IMG][/url] You can see at the end of the subcircuit file D3 and R1 define a series diode and resistor between grid (node 2) and cathode (node 3). R1 = 2k, and the diode is defined by the .MODEL DX statement, having a saturation current IS = 1nA, this represents quite a "large" diode that will conduct about 1uA at 0.17V forward bias and 300mA at 0.5V! In general, large signal analysis at the extremes of the tube's normal operating range will deviate more from real life, as the model accuracy becomes poorer. But do not let any of this discourage you from using Spice. It is a great tool, particularly if you are interested in trends (what-if type improvements) that will help optimise the circuit before committing to breadboard. [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Preamp/phase inverter simulation in LTSpice
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