Input signal with respect to cathode bias voltage

Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

over in the tubes section there is a discussion about a balanced circuit. Looking at the schematic I had a question. The input tube is cathode biased with a 910 ohm resistor to 1.8 volts, however the specifications for the preamp says that it has a max input signal of 10.5 volts RMS. This seems a bit irrational, am I missing something? A 4v signal would drive the grid positive and completely distort. Isn't around 3v RMS the max on a tube with a 1.8v cathode bias?

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Topic - Input signal with respect to cathode bias voltage - Chip647 14:26:40 01/08/25 (8)

It doesn't work that way - Ralph 10:38:45 01/09/25 (1)

Thanks Ralph. That makes sense. - Chip647 07:55:43 01/10/25 (0)

Which discussion? Which schematic? - Triode_Kingdom 19:55:26 01/08/25 (5)

RE: Which discussion? Which schematic? - Chip647 07:02:36 01/09/25 (4)

Input Voltage - Triode_Kingdom 09:53:50 01/09/25 (3)

RE: Input Voltage - Chip647 13:57:18 01/09/25 (2)

RE: Input Voltage - Triode_Kingdom 16:05:50 01/09/25 (1)

RE: Input Voltage - Chip647 07:44:36 01/10/25 (0)

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