* Revox A77 Record Amplifier (1.077.705) - 120 kHz Bias Trap Parameter Sweep

* Define base parameters
.param C_val=390p
.param L_val=4.51m

* Input voltage source
V1 in 0 AC 1

* Source resistance
Rs in trap_in 1k

* Parallel LC Bias Trap with variable parameters
L501 trap_in out {L_val}
C517 trap_in out {C_val}

* Load resistance
Rl out 0 50k

* AC Analysis
.ac dec 1000 102k 140k

* Step capacitance using a list of standard values
.step param C_val list 330p 390p 470p

* Step inductance linearly (e.g., core tuning from 4.3 mH to 4.7 mH with 0.1 mH step)
* To sweep L_val, uncomment the following line:
* .step param L_val 4.3m 4.7m 0.1m