Hello.
For the 12.6/6.3V heater tubes, with a centre-tapped heater, such as
12AX7,
etc., apparently one can ground pin 9 and supply 6.3V to pins 4 and 5, or
alternatively, ground pins 4 and 5 and supply 6.3V to pin 9.
I am wondering, is there a preferred way of doing it? Which connection
results in a lower hum?
If there is no difference hum-wise, perhaps grounding of pin 9 is more
convenient in case one wants to plug in a 6.3V only tube, e.g. ECC85 or
Russian 6N2P -- less rewiring will be needed.
What do you think?
Regardss,
Alex
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