• Re: V.35 amps Chris O 08:53:34 10/04/00 (4)
  In Reply to: V.35 amps posted by George on October 02, 2000 at 23:51:10:

  Yes, I have one that I have been using for over 3 years. It is a great basic EL34 amp. The quality of the transformers place it well ahead of the other cheap amps currently on the market. There is room to do parts upgrades as the included caps are good but fairly basic.
  
  

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  • Re: V.35 amps George 17:07:54 10/04/00 (3)
    In Reply to: Re: V.35 amps posted by Chris O on October 04, 2000 at 08:53:34:

    Hi

    I live in India, and got a kit V.35 amp across in bits and pieces. Anyway after it all came in, I got it assembled, and it is now working for the past 2-3 months, and am enjoying it. I seem to have a hum that comes out of the speakers audible at a distance of about 2 ft. Otherwise, it sounds very good(this is my first exposure to a valve amp). It is coupled to a solid state preamp from Audio by Van Alstine(also brought to India as a kit), and an Onkyo CD changer.

    Could anyone advise me how to trouble shoot to try and eliminate the hum?

    Thanks
    
    

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    • Re: V.35 amps Chris O 12:10:39 10/05/00 (1)
      In Reply to: Re: V.35 amps posted by George on October 04, 2000 at 17:07:54:

      George,
      The most likely cause of hum in a newly constructed amp is the internal ground wiring. Carefully go back through the construction process and check to make sure that you followed the grounding suggestions and schematics to the letter. If this was done and the hum still persists, try moving some of the internal grounds to a central ground (star ground). Also, you did not mention if the hum was coming from one or both channels. If it was one channel, switch the interconnect leads coming in to the amp to see if the hum follows. This would indicate a system ground loop. You could try floating the associated equipment earth grounds on the a/c plug or on the amp itself. You could also try cutting the grounds on one end of a cheap pair of interconnects to see if it helps. Try switching the tubes around to see if the noise follows one tube in particular. Chances are that the hum is due to internal ground wiring inside the amp. My v35 is dead quiet. Good Luck. Chris O
      
      

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      • Re: V.35 amps George 04:00:22 10/31/00 (0)
        In Reply to: Re: V.35 amps posted by Chris O on October 05, 2000 at 12:10:39:

        Thanks Chris. I was travelling outside the country and just got back yesterday. I will try out what you suggested.
        
        

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    • Re: V.35 amps hum solutions Chris O 08:08:43 10/05/00 (0)
      In Reply to: Re: V.35 amps posted by George on October 04, 2000 at 17:07:54:

      George, Eliminating hum is one of the challenges facing any amplifier design, tube or otherwise. From a build stand point, make sure you followed the grounding layout in the instrutions to the letter. Ground loops can be created even though it looks like it should work electrically. Is the hum comming from only one channel or from both channels equally? If it is from one channel, switch the interconnects left and right at the amp and see if the noise moves to that channel. If it does, it is probably a system ground loop. Try using a "cheeter" plug on various components (an adaptor which bypasses the ground prong on your power cord. You can even try modifying an interconnect to cut the ground connection at one end. Tubes can also cause hum. Try switching them between channels to see if the hum changes. Chances are that the hum is due to how you wired the ground connections internally inside the amp. My V35 is dead quiet. I hope this helps.
      
      

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