At your risk. Proctect your hearing.
Short circuiting the input. Listening for hiss. Then increase the terminating input resistor of a just noticeable difference (JND). Measure this terminating resistor.
Since this may corespond to a change of 3dB [Stevens] (doubling of power) this method may give similar results to objective VU meter ewuivant noise resistance measurements [Pearson]?
References:
Sound and Hearing - S S Stevens, Fred Warshopsky - Time science series
Fluctuation noise in Vacuum Tubes - Pearson
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