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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)
- Here is your explanation. I own the Precision Fidelity C7 Preamp, your predecessor.... - tubesforever 01:06:31 12/16/05 (41)
- Re: Here is your explanation. I own the Precision Fidelity C7 Preamp, your predecessor.... - bjh 06:47:52 12/16/05 (36)
- Re: Here is your explanation. I own the Precision Fidelity C7 Preamp, your predecessor.... - John Elison 12:42:40 12/16/05 (6)
- Well some folk have a penchant for - bjh 16:32:06 12/16/05 (0)
- a Zen moment with John - KT88 16:03:46 12/16/05 (0)
- What's that term you're so very fond of? - Fretless 13:14:15 12/16/05 (0)
- I love my POS tube distortion. Sounds great. - tketcham 13:02:20 12/16/05 (2)
- Sounds great. Good answer. - KT88 15:45:37 12/16/05 (1)
- he already did, didn't he? - stark 14:44:13 12/17/05 (0)
- Another T4 SolidGold Moment .. nt - J.D. 09:29:58 12/16/05 (28)
- Guess you think I make all this up.... - tubesforever 20:13:34 12/16/05 (6)
- spare us the guesswork - J.D. 21:05:19 12/16/05 (5)
- At least Salvatore is respectable, not like your advice. - tubesforever 23:14:00 12/16/05 (4)
- After name-calling, why not show the "relationship between the C7 and Jolida JD9" circuits ? - J.D. 11:10:24 12/17/05 (0)
- Let me say that I suspect your - bjh 08:49:35 12/17/05 (2)
- Salvatore sold gear, so at least his opinions are based on experience. - tubesforever 10:55:28 12/17/05 (1)
- Oh, so the relationship is that both the C7 and a JD9? are hybrid designs? - bjh 15:04:21 12/17/05 (0)
- And, sadly, the Hits just keep ooooon comin' - Fretless 12:12:11 12/16/05 (20)
- And, if you act right now .................... - J.D. 14:57:22 12/16/05 (6)
- And if you only had a clue... - tubesforever 20:19:52 12/16/05 (5)
- try skipping the wide-open blue-sky guesses - J.D. 20:59:07 12/16/05 (4)
- Excuse YOU! There is nothing technical in my answer - tubesforever 21:02:08 12/16/05 (3)
- there is nothing "answer" in your answer ................................................ nt - J.D. 21:07:54 12/16/05 (2)
- And there is no answer in your sophmoric response. Take the year off and spare us all. - tubesforever 23:16:23 12/16/05 (1)
- I wonder how many poor souls have actually wasted their hard-earned dough your ridiculous stupidity... - John Elison 12:19:04 12/16/05 (12)
- Must be hundreds by now... - Fretless 12:36:35 12/16/05 (11)
- Must be! - John Elison 12:46:44 12/16/05 (10)
- When did this conversation degenerate into talking about shoes? (n/t) - Dick Schneiders 13:15:10 12/16/05 (9)
- Right about the time that John put his foot in his mouth (nt) - Fretless 13:18:27 12/16/05 (8)
- Re: Right about the time that John put his foot in his mouth (nt) - John Elison 13:52:37 12/16/05 (7)
- go for it, fretless.... throw in a new AT OC9 just to make for a better story afterwards ... - J.D. 14:42:17 12/16/05 (0)
- Now that IS tempting... - Fretless 13:56:12 12/16/05 (5)
- Re: Now that IS tempting... - Fretless 14:07:51 12/16/05 (4)
- Re: Now that IS tempting... - John Elison 14:40:50 12/16/05 (3)
- John you are so right.... - tubesforever 20:28:43 12/16/05 (0)
- Let's do it - Fretless 14:54:24 12/16/05 (1)
- hell, he has mine! (nt) - KT88 16:05:51 12/16/05 (0)
- Probably not even close but a nice story anyway. :-) [nt - garth 04:27:58 12/16/05 (3)
- From www.high-endaudio.com Arthur Salvatore's Recommended Components... - tubesforever 19:50:02 12/16/05 (0)
- You gotta have faith, Garth! Say, over & over, "I believe, I believe". :-) (n/t) - Dick Schneiders 04:44:56 12/16/05 (1)
- Re: Yes, Garth, tell Dick you believe---He really needs to hear it. ;-) (nt) - John Elison 13:27:33 12/16/05 (0)
- Re: Could it be the tubes are a buffer and not amplifying? - SirAnthony 00:34:53 12/16/05 (1)
- Oh, they're definitely amplifying... - tketcham 08:11:41 12/16/05 (0)
- I've looked inside my own JD9 and - bjh 20:59:58 12/15/05 (1)
- Thank you. It's making sense now. And for my first real financial commitment to vinyl... - tketcham 21:33:44 12/15/05 (0)
- Unplug and measure - Mark Kelly 19:41:57 12/15/05 (5)
- This is what I get... - tketcham 20:32:51 12/15/05 (2)
- Re: This is what I get... - John Elison 22:36:59 12/15/05 (1)
- Thanks, John. Now I know how to properly use this ohm meter. nt - tketcham 07:46:08 12/16/05 (0)
- You'll have to excuse my ignorance, but what am I looking for? nt - tketcham 19:43:25 12/15/05 (1)
- Resistance - Mark Kelly 19:46:50 12/15/05 (0)