Hi,
I've used centre tap as well as floating w/one leg grounded with a 'lytic cap (2.2-4.7uF) in mic stages, where noise is very noticeable. I'd say there's at best a 6dB favor for the centre tap. However, if you tie the heaters to say, +30V, there seems moot difference between the methods.
I've used centre tap as well as floating w/one leg grounded with a 'lytic cap (2.2-4.7uF) in mic stages, where noise is very noticeable. I'd say there's at best a 6dB favor for the centre tap. However, if you tie the heaters to say, +30V, there seems moot difference between the methods.
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