fini Posted December 20, 2003 Author Share Posted December 20, 2003 ...and things that do hum should be messed with (3rd prong-wise)? I guess not...fergeddit Quote Link to comment Share on other sites More sharing options...
Woodog Posted December 20, 2003 Share Posted December 20, 2003 ---------------- On 12/20/2003 9:11:37 AM fini wrote: Well, if my balls don't produce, I may have to send Fisher for a hum job. ---------------- I see dead kittens. woo Quote Link to comment Share on other sites More sharing options...
LarryC Posted December 20, 2003 Share Posted December 20, 2003 Fini, Are any shipping screws still tightened down? I'm not familiar with that table or if it has a floating suspension, but being tightened down could create exaggerated feedback. Larry Quote Link to comment Share on other sites More sharing options...
Clipped and Shorn Posted December 20, 2003 Share Posted December 20, 2003 The arm on fini's turntable can be jiggled in all directions. If you hold the arm in your fingers, you can jiggle it up and down, and side ways. It is a loose fit. I am not sure if this is supposed to be this way, but it seemed strange to me, and something that could make the arm (and thus the cartridge) susceptible to picking up vibrations in the air and through the table. C&S Quote Link to comment Share on other sites More sharing options...
hwatkins Posted December 20, 2003 Share Posted December 20, 2003 WEll I want to play on this advice thread as well. Fini, be sure to check your RCA (I believe that table uses RCA) connections as well. Simple jiggling should work. Since the ground needs to be continous through out your system, an open in this wiring (usually in the RCA connector) can cause a hum. Happened here before. Also I got confused, what size balls do I need to play in the audiophile arena? Quote Link to comment Share on other sites More sharing options...
fini Posted December 20, 2003 Author Share Posted December 20, 2003 Henry, Big balls, a little nuts. Oh, the hum is there even when the RCAs from the TT are disconnected. I did notice a lower-frequency hum builds as I bring my finger closer to one of the 12AX7's, # V14. Quote Link to comment Share on other sites More sharing options...
fini Posted December 20, 2003 Author Share Posted December 20, 2003 The attached photo of a portion of the schematic is large. And a little blurry...sorry. Quote Link to comment Share on other sites More sharing options...
Clipped and Shorn Posted December 20, 2003 Share Posted December 20, 2003 fini, this hobby, especially with tubes and phono turntables, is one that has to be fussed with a bit. you might try what Craig told to me, eg. do some tube rolling in the preamp section, cannot hurt to give it a try. is it possible that tube originally had a shield? like Mark says, that hum stuff is everywhere in the air and those pre amp tubes are just sitting there waiting to absorb it. the level of hum that i heard in your system did not seem like an AC issue, it is more likely in the Fisher and you might want to hear what Mike Z. has to tell you. Stop listening to hum and put on some music, you won't notice it. Also, just think of all the $$$$ you have actually saved by picking up this vintage crap, heh heh. lordy, lots of laughs, just kidding, ...... I dropped much more $$$$ and went through the same fussing anyway..... C&S C&S Quote Link to comment Share on other sites More sharing options...
fini Posted December 20, 2003 Author Share Posted December 20, 2003 Yeah, I should stop paying attention and let the magic envelop me... BTW, Paloma thought I'd left. I really am just out da door.... Quote Link to comment Share on other sites More sharing options...
bkrop Posted December 20, 2003 Share Posted December 20, 2003 Fini, STOP! That is the dreaded DO NOT TOUCH tube! Quote Link to comment Share on other sites More sharing options...
Daddy Dee Posted December 20, 2003 Share Posted December 20, 2003 ---------------- On 12/20/2003 8:13:54 PM fini wrote: Yeah, I should stop paying attention and let the magic envelop me... _--------------------------------------- Fini, Yep, that's the real deal your talking about there. Quote Link to comment Share on other sites More sharing options...
fini Posted December 21, 2003 Author Share Posted December 21, 2003 Mark, Any chance rolling that tube could solve the problem? Could it hurt? Quote Link to comment Share on other sites More sharing options...
NOSValves Posted December 21, 2003 Share Posted December 21, 2003 Fini it won't hurt it give it a try ! Quote Link to comment Share on other sites More sharing options...
fini Posted December 21, 2003 Author Share Posted December 21, 2003 Craig, I have a boatload of 12AX7s (and 12AU7s) from disecting organs, plus tons of tubes (excellent brands) in all that old tube test equipment I picked up last Summer. I can roll all Winter! Quote Link to comment Share on other sites More sharing options...
ShapeShifter Posted December 21, 2003 Share Posted December 21, 2003 Fini, My Technics SL-D2 Turntable and Fisher 800B Receiver are inches from the Cornwalls and there's no hum or feedback. Initially experienced feedback when I had the TT connected to the rear terminal strips "EXT Ground" connection. Used a seperate connection to the chassis, no more problems. If you are using a ground on the rear terminal strips, try grounding the table using a chassis only screw. Good luck, Wes Quote Link to comment Share on other sites More sharing options...
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