Electronic – Simulating triodes in LTSpice, Long tail pair phase splitter

audioltspicesimulationvacuum-tube

I am attempting to simulate a long tail pair phase splitter using two 12AX7 triodes in LTSpice.

I tried multiple subcircuit models for the triode, all yielding the same results.
I want to know if the circuit is wrong, or if the simulation is wrong.

The distortion of the signal is intentional, this is from a guitar amp with high distortion.
I want to build this circuit, but as its from the internet and quite expensive, wanted to make sure it works and understand it by simulation.

Here is the relevant part from the schematic:

enter image description here

VC Approaches 250V, but on the transient reaches only about 120, still the problem is obvious.
VA Approaches 310V
VB Approaches 300V
The phase splitter is supposed to drive a 6bq5 / EL84 push-pull pair.

And here is the transient analysis result.

enter image description here

What am I doing wrong either in the simulation or in the circuit?

Best Answer

What is the "Time to Start Saving Data"? It is very possible that the circuit will not work as expected for a few seconds because the simulation is also simulating thermal tube stuff that takes a while to stabilize. Maybe 10's of seconds. So your simulation should be like from 10s to 10.1s for 100ms.

Related Topic