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In Reply to: something stinks posted by garth on December 15, 2005 at 10:45:04:
Henry
Follow Ups:
the output appears to be VERY high, unless I'm completely and totally stupid, dumb, and incompetent. Well, that's besides the point. The specs JoLida states seem to be close to what I'm getting. And this guy also experienced (see link below):
Dumbo El Stupido.
I read the article and it seems to confirm both our suspecions. From the two words on the web site I figured the tube(s) was on the output after the actual phonostage output which probably gives that final 20dB boost difference.No offense but anyone buying this product thinking he is getting a tube RIAA phono amplifier was tricked. That doesn't mean it doesn't nor can't sound good. I happen to use a SS RIAA phono amp and SS line preamp.
To test whether the LOW OUT runs through those tubes, I guess I could buy another set and swap them out to see if I hear a difference. If I do, then it's as it should be. But if I don't, then 1) there's no difference in sound between the tubes I try, or, 2) there is but I can't hear the difference, or, 3) the low out does not go through the tubes, or, 4) both 1 and 3, or, 5) both 2 and 3.Maybe someone else with a JoLida JD 9 that does have a spare set of 12AX7 tubes could try testing the LOW OUT to see if it is in fact a tubed output.
Tom
Just turn off the unit and pull the tubes. Turn it bac on and if both are dead then it does indeed go through the tube output in each case.
I pulled the tubes (they're Electro Harmonix tubes by the way) and sure enough it appears that both HI OUT and LO OUT use the tubes as explained to me by JoLida.And then it gets interesting. The outputs were not dead. But both had much less (relative) gain and were noisy, sort of like a gentle breeze across a microphone. I put the tubes back in and the rich full detailed sound returned.
So yes, Virginia, the JoLida JD 9 has TUBED output for both output levels.
a thought did occur to me about the seemingly odd occurance of sound coming from both outputs without the tubes in place...Could it be (I may be crucified for this, but) that with the tubes removed there is a bias voltage difference appearing in the circuit and perceived as if it were a signal, when it isn't?
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