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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Advice on transformer coupled input / driver posted by martyh on March 3, 2007 at 10:04:52:
Hi Marty,
The designer of this amplifier paid close attention to separating signal reference ground and power ground. The signal is applied between the grid and cathode. The input signal reference is the junction of the two 10-Ohm resistors. The 0.47uF capacitor connects the center tap of the transformer to this reference. The 47K resistor provides a DC reference for the grids. DC current through the 300-Ohm resistor provides bias for the tubes. Any output signal AC current through the 300-Ohm resistor, due to tube mis-matching or circuit imbalances, will not affect the bias because any voltage is common mode injected into the signal reference point.Who is the designer by the way?
Dave
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Follow Ups
- Re: Advice on transformer coupled input / driver - Dave Davenport 22:26:59 03/03/07 (5)
- The designer is Tadaatsu Atarashi - martyh 05:21:27 03/04/07 (4)
- Re: The designer is Tadaatsu Atarashi - Dave Davenport 08:47:16 03/04/07 (3)
- Thanks! - martyh 10:29:51 03/04/07 (2)
- Re: Thanks! - Dave Davenport 13:56:35 03/04/07 (0)
- Re: Thanks! - arend-jan 11:47:57 03/04/07 (0)
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