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In the Forum: Analog Playback
In the Thread: The last phonocorrector: “End of Life" Phonostage

Post Subject: It is true but it negligible.Posted by Romy the Cat on: 8/1/2011

Yes, you are right, the voltage divider from 6.3V across 47K and 10K resistors shall give not 0.9V but 1.1V. However, the numbers that are in circuit are not something that I saw in my dreams but the actual numbers that I measured. I might presume that at the time I measured it I did not run the phonostage from my AC stable PP2000 but from wall and the voltage was lower and I did not have 6.3V but perhaps 6.1V or something like this. All those numbers are perfectly acceptable and with 1V basis the 12AX7 is not near to be closed up. I do not know what curves you looked at but 1V is fine bias for this tube and with 140-150V on plate it is perfectly fine operational point. Thanks for spotting the .2 difference but I think it is in given case negligible.

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