The sound was great too. Perhaps bigger with less treble detail, softer and easier than when Vh=Vb=1.2V and Pleiades pull up bias resistor of 1.9MΩ. Both sounds are world class. More experiments are needed.
Plate supply was 9V. (Always use a suitable fuse in series with any battery).
See also previous post on varying high pass cutoff frequency by varying the anode current.
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