Re: 3 Tube Ocean Hopper (battery type)
If you have a Single ended transformer tucked away for say a ECL86 or similar, use that, put the primary where the High impedance headphones would go and listen across the secondary/normal speaker output.
It's what I did when I built a 1920/1930 style radio, as I did not want HT by my ears.
An old output transformer from a valve picnic radio, or even a small mains to 6 or 9 Volt transformer around 100mA may be worth trying.
Adrian
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