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Ok, you phono stage experts, explain this... ('cause I'm totally confused now.)

As opposed to my usual confused state.

I just tested my new JoLida JD 9 phono preamp to see if both output levels use the tubes (JoLida test) and am now wondering how did they do that? What is going on inside that black box? (Silver boxes inside actually.)

Here's what I see inside. Input terminal box has all the dip switching circuits and then the signal goes to the ss board with the tubes integated into the board. From there the signal goes to the HI and LO output terminals (another smaller silver box) WITH ONLY ONE SET OF WIRES!

If I pull the tubes, the signal still gets to the outputs, but it's obviously not being powered by the tubes. The output is much reduced and noisy. So how do you get dramatically different output levels from one set of wires? Do the RCA interconnects when plugged into the output terminals serve as a passive switching mechanism for the amount of gain to feed through the tubes and into the output terminals?

(As Rodney Dangerfield whispers to the movie audience during class in Back To School: "Nice guy. Really seems to care. About what I have no idea.")

Tom



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Topic - Ok, you phono stage experts, explain this... ('cause I'm totally confused now.) - tketcham 19:38:10 12/15/05 (52)


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