Library of circuits solvers

Click in any of below diagrams to simulate circuit. The online calculators all deliver DC quiescent state, but none include AC small-signal estimations.

C1 – Basic gain stage
C3 – Fixed-bias
cathode follower
C2 – Self-bias cathodyne
phase inverter
(also cathode follower)
C5 – Fixed-bias cathodyne
phase inverter
C4 – Gain stage
+DC-coupled cathode follower
C6 – Cascode
C8 – Cascode SRPP
C7 – Phase inverter
fixed or cathode bias
C11 – Dual-triode mixer
C12 – Dual-triode mixer
with dissimilar cathode circuits

Circuits available only in PC app

From version 1.9, most calculators deliver small-signal estimations of gain and impedances.

C9 – Dual stage amplifier with level shifting
C10 – Phase inverter: constant-current bias

C13 – Gain stage, constant current bias
C14 – Gain stages with DC level shifting
C15 – Differential phase inverter, long-tail pair, cathode bias
C16 – Serial voltage regulator
C17 – Basic serial voltage regulator
C18 – Shunt voltage regulator
C19 – 3-stage coupled by HV line
C20 – 2-stage coupled by HV line
C21 – “Aikido” cascode (Tubecad)
C22 – Cascode for preamp (Tubecad)
C23 – PP amplifier DC feedback (Tubecad) 
C24 – SRPP headphone amplifier (Tubecad)
C25 – Basic current source
C26 – CCDA Constant Current Draw Amplifier line amplifier (Tubecad)
C27 – Janus cascode Shunt regulator (Tubecad)
C28 – Totem pole split load phase splitter (Tubecad)
C29 – Triode with anode to grid feedback
C30 – Mu-follower
C31 – Cascode SRPP+
C32 – Common-grid gain stage
C33 – White cathode follower
C34 – Half-mu stage
C35 – Cathode follower with current sink
C36 – Pentode amplifier
C37 – SE triode power
C38 – SE pentode power