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Technics SU-VZ320 amp

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    Technics SU-VZ320 amp

    amp is over 10 years old. volume control is weird - one speaker is louder than the other and some crackling on that speaker before a decently loud volume is selected. sometimes that one speaker is going quiet occasionally.

    what kind of servicing should i do? renew the solder joints i guess, should i remove each solder and put new or do i just heat and add solder. any ideas? what about the caps should i look into renewing them? what else?

    its kinda sentimental value. lots of music went through that thing....
    capacitor lab yachtmati techmati

    #2
    Re: Technics SU-VZ320 amp

    clean all the pots with deoxit.
    check and touch up solder joints.check/adust bias/offset.

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      #3
      Re: Technics SU-VZ320 amp

      thanks kc8, can you come again on how i do that :

      check/adust bias/offset.
      capacitor lab yachtmati techmati

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        #4
        Re: Technics SU-VZ320 amp

        its with the opamps right? i have to adjust the pots? i will get a pic to figure this out.
        capacitor lab yachtmati techmati

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          #5
          Re: Technics SU-VZ320 amp

          I'd look at the volume pot. It probably requires cleaning or replacement.

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            #6
            Re: Technics SU-VZ320 amp

            Originally posted by Rainbow
            I'd look at the volume pot. It probably requires cleaning or replacement.
            I had a really old amp with a bad volume control, the sound would crackle, but if i "massaged" the volume knob for a min it would be fine for an hour...

            Electronic spray also helped, but only for a short while; I found a good fix though, I bought a new receiver :P

            This one has Toslink which I kinda needed also so it was not only for the bad volume knob I retired the old one
            "The one who says it cannot be done should never interrupt the one who is doing it."

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              #7
              Re: Technics SU-VZ320 amp

              here's some pics. threads are boring without pics







              so i will try to find a replacement pot on monday and i am renewing the soldering today.
              Attached Files
              capacitor lab yachtmati techmati

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                #8
                Re: Technics SU-VZ320 amp

                The layout is lean, mean and clean - even by Matsushita's usually superb standards. My only quibble is that I dislike integrated power-amp modules - I prefer discrete bipolar O/P stages any day. This just can't be modded meaningfully at all.

                On another note, this Panasonic bookshelf-audio system produces stunning sound - even better than $10k high-end separates from ~10 years ago (just ignore the PMPO crap):

                http://www.jbronline.com/storefront/...ProductId=3266

                Entry-level level audio standards have gone up considerably in 10 years.

                Comment


                  #9
                  Re: Technics SU-VZ320 amp

                  As others have recommended, clean the volume pot

                  I was just given an old JVC RX-315 receiver about the same age, and am wishing its problems were as easy as a dirty pot. It won't switch inputs anymore. One channel was dead too, but resoldering everything fixed that problem. Actually not sure I'll even bother with it - I have no use for the thing.

                  Comment


                    #10
                    Re: Technics SU-VZ320 amp

                    i couldnt find a 100kohm pot, they only had a 50. anyway i got some philips degreaser cleaner. its extrememly flammable which i guess is a good sign.. i opened the pot and then sprayed it and worked the pot. the crackling is gone but there is a point where one speaker goes off and the pot clicks at that point i believe. anyway no biggie. i resoldered the secondary board. i will do the rest this long greek easter holiday (4 day weekend yeah! )

                    is a 50 ohm pot going to be too insensitive?

                    i will get a new amp sometime when i finally choose one. i am listening to mp3s most of the time via the audiophile 192 to b&w 302s so i probably dont need anything really expensive. i always had my eye on an arcam. the nad i heard to be good also.

                    check this one http://www.avihifi.co.uk/IntAmp/Integrated%20Amp.html
                    alas very expensive.
                    Last edited by willawake; 04-20-2006, 12:26 PM.
                    capacitor lab yachtmati techmati

                    Comment


                      #11
                      Re: Technics SU-VZ320 amp

                      ......linuxguru got me checking out amps again. in the around 1000 euro category we have

                      Roksan Kandy Integrated Amplifier MkIII 115w



                      Rotel RA-1070 100w



                      http://www.tnt-audio.com/ampli/rotel1070_e.html
                      Attached Files
                      capacitor lab yachtmati techmati

                      Comment


                        #12
                        Re: Technics SU-VZ320 amp

                        nahhhhh find an old sansui g-33000
                        havnt found anything new that can touch mine.
                        i use a fisher 400 on this pc.yes its full of tubes.
                        heres a pic of a g-33000

                        Attached Files
                        Last edited by willawake; 04-22-2006, 05:37 AM. Reason: put pic inline

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                          #13
                          Re: Technics SU-VZ320 amp

                          its a vintage monster receiver
                          capacitor lab yachtmati techmati

                          Comment


                            #14
                            Re: Technics SU-VZ320 amp

                            really classy too. I want a G-5700.
                            The great capacitor showdown!

                            Comment


                              #15
                              Re: Technics SU-VZ320 amp



                              there is much hype about NAD on the boards - nad c372
                              Attached Files
                              capacitor lab yachtmati techmati

                              Comment


                                #16
                                Re: Technics SU-VZ320 amp

                                just watch out for that output IC. them things are a bitch. WAY expensive to replace. I know from experiance, i lost one IC from a technics SV-GU90 or something like that. I cant remember now.

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