• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

7H 150mA shock coil

I believe you mean a choke coil (inductor). I’m not expert in coil winding but the answer involves your available iron core. In general:

To calculate the inductance of a coil on an iron core, use the formula: L = (μ₀ * μr * N² * A) / l; where L is the inductance in Henries, μ₀ is the permeability of free space (4π x 10^-7 H/m), μr is the relative permeability of the iron core, N is the number of turns on the coil, A is the cross-sectional area of the core, and l is the length of the core.
 
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