Tweakers' Asylum

• Well, know I'm not sure what the problem is. - Dan_ed 18:28:15 07/20/03 (1)
  In Reply to: Where to get replacement RCA connectors for 834P? posted by Dan_ed on July 19, 2003 at 06:00:23:

  I completely removed the input rca pair from the circuit board and wired in two seperate female rca jack. It is a little noisy but I didn't bother to mount the jacks onto the chassis, they are just laying next to the box with the TT lead plugged into them. Anyway, I get good signal in both channels for about 20 seconds and then the right channel goes out. I have tried changing tubes but that made no difference. Could this be a cap going bad?

  I also found a jumper wire that connects the right input to one of the pins on the MM/MC switch. It is essentially in the LK 1 position. Any ideas as to what this does?
  
  

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  • Try this... - KIS 10:21:25 07/21/03 (0)
    In Reply to: Well, know I'm not sure what the problem is. posted by Dan_ed on July 20, 2003 at 18:28:15:

    Hi Dan

    See if you can get any change if you go MC or MM. Sometimes it is that stupid push bottom device.

    I can't remember a jumper wire in mine. I have taken out the MC/MM button when I replaced the RCA. Everything is now hard wired to the PCB.

    Can't tell what problem you may be having. Have you checked the out-put connection as they are just as bad as the input ones.

    Also check you soldering for short. Did you solder the input to pin 2 and 7 on the input tube socket directly?

    Cheers
    
    

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• Maybe it's just loose... - randallt 18:15:42 07/19/03 (1)
  In Reply to: Where to get replacement RCA connectors for 834P? posted by Dan_ed on July 19, 2003 at 06:00:23:

  Can you tighten it down? Sounds like you're losing your ground. Check the nut on the back, some RCA's are grounded to the chassis (some are not). You can tell if it's NOT a grounded type as there should be some kind of plastic shoulder washer.

  BTW-visual inspection of a solder joint is no substitute for using a meter to check, When in doubt, resolder.
  
  

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  • Re: Maybe it's just loose... - Dan_ed 18:35:57 07/19/03 (0)
    In Reply to: Maybe it's just loose... posted by randallt on July 19, 2003 at 18:15:42:

    Thanks for the suggestion randallt, but it's not the usual type of RCA chassis mount. Being that these connectors are mechanically fastened to the circuit board and the box I doubt that I could wiggle it enough to jostle a loose connection at the board. You really need to see these pieces on an 834P to understand how solid a mount it is. I'm pretty sure it is within the connector. I have seen many a cold or cracked solder and can usually spot them right off under a microscope. But there is always a first time. Hey, I've got lots of time to look while I wait for parts to ship.
    
    

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• I have replaced mine with Cardas RCAs. - KIS 10:10:57 07/19/03 (5)
  In Reply to: Where to get replacement RCA connectors for 834P? posted by Dan_ed on July 19, 2003 at 06:00:23:

  Hi Dan

  It is not too difficult. Leave those original RCA there (I had physically cut the connection to it, but you do not have to) as they are holding the chassis together.

  Drill four (two if you do not want to go the whole hog) holes to fit the size of female RCA connectors of your choice. There should be enough room at the back of the chassis panel. Solder good quality cables to where the original trace on the circuit board, and connect them to the RCAs. Put them back together and you are done.

  Do not be put off by the way the chassis is screwed together. If you do it once or twice, you would very quickly get the hang of it. I have taken mine apart for mods more than 50 times.

  Cheers
  
  

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  • Re: I have replaced mine with Cardas RCAs. - Dan_ed 16:31:45 07/19/03 (4)
    In Reply to: I have replaced mine with Cardas RCAs. posted by KIS on July 19, 2003 at 10:10:57:

    Thanks KIS,

    It sounds like you just by-passed the old ones and installed the new ones in new holes? That's a thought. I'll have to look at them a little closer, maybe I can drill the old ones out and install the new ones through the hollowed out shell that would be left. I probably will replace them all and do some of the Thorsten mods while I'm in there. I just finished rewiring my MMF 7 with Cardas wires so it would be nice to freshen up the phono stage.
    
    
    

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    • Thorsten Mods... - KIS 06:05:51 07/20/03 (3)
      In Reply to: Re: I have replaced mine with Cardas RCAs. posted by Dan_ed on July 19, 2003 at 16:31:45:

      Hi Dan

      "...I can drill the old ones out and install the new ones through the hollowed out shell.."

      You can't drill them out as they carry the screw-thread holding the PC board.

      I have tested most of Thorsten mods on my EAR. You should give it a go - it is mostly good. I have also gone the whole hog by building from scratch a two chassis job. If you need ideas on parts and how they sound, just "ping" me. I am on the second scratch build EAR to get it note perfect.

      Cheers
      
      

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      • Re: Thorsten Mods... - Dan_ed 10:30:44 07/20/03 (2)
        In Reply to: Thorsten Mods... posted by KIS on July 20, 2003 at 06:05:51:

        Yes, after looking again I see what you mean about just drilling them out. I may just cut them down with a dremel enough to lose the two rca's but still keep the lower screw to support the back end of the board. That would give me more room to squeeze in the new jacks.

        Did you use the Cardas GRFA chassis mount female rca's? I used the Vampire cm1f/ofc's when I rewired the TT and thought about using them here as well. I have printed out Thorsten's guide and will start making a list for Percy Audio. Thanks for the offer for on parts ideas. I will take you up on that just as soon as I get the mods straight in my mind.
        
        

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        • RCA? - KIS 11:06:25 07/20/03 (1)
          In Reply to: Re: Thorsten Mods... posted by Dan_ed on July 20, 2003 at 10:30:44:

          Hi Dan

          On my EAR and my first build from scratch, I have used Cardas Rhodium Chassis female. But after thinking things through, I have decided to go with one 5-pin XLR for phono input in my new project.

          I am going to have one XLR as in phase, and one XLR as Out of phase, so that I do not have to run to the back of my speakers to switch speaker wires for out of phase recordings. The added advantage of having two phono input also allow me to plug a shorted plug on the unused XLR for mono listening.

          Cheers
          
          

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          • Re: RCA? - Dan_ed 03:33:20 07/21/03 (0)
            In Reply to: RCA? posted by KIS on July 20, 2003 at 11:06:25:

            KIS,

            I tried to send you an email but it won't go through AA. Please send me your email address. Also, see my new post under this thread. My problem must be further in the circuit than the rca connection. Oh well, I was going to change them anyway.

            Dan
            
            

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