Teac Model 5 recap help

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  • ChunkyBustout
    New Member
    • Mar 2011
    • 1
    #1

    Teac Model 5 recap help

    Hello all,

    I am in the process of creating a shopping list of parts and wanted to know if there a standard as far as recapping different sections of a 1975 mixing board. I'm doing the Monitor/Master module first since it's needed more there. Then it's on to the power supply then input channels and last, the sub module. I know on a mixer's power supply, you can replace the caps with the largest capacity that will fit. For the signal path, I know this isn't as simple. Do I use the exact capacity I'm replacing or ...? I don't want to have to return inside the mixer to do more recapping because I didn't take care of it the first time.

    There are electrolytic, ceramic, mylar and polystyrene caps on the Monitor/Master module - any suggestions on exchanging one type for another to maximize improvements to the circuit?

    All suggestions, ideas and info regarding this would be very appreciated.

    Thanks,
    CB
    Tags: None
    • TheLaw
      Badcaps Veteran
      • Jan 2011
      • 477
      #2
      Re: Teac Model 5 recap help

      I'm no expert, but usually capacitor type should be left the same because different types of capacitors have different functions. Ceramics can do a lot of high-end filtering, while the electrolytics will be used for the bigger values that can't be achieved with polyester/polypropylene. If you were to replace different types of caps, I think a safe bet would be to replace electrolytic with film, try finding a 470uF film cap....oh wait, that would be the size of my car.

      For brands to pick out.

      Don't be stupid and buy those overpriced "audiophile" crap. It's a bunch of bologna. You won't hear the difference, and please don't convince yourself you will. However, there's no hurt in getting good quality components. Just don't go over the top.

      Electrolytic: Panasonic FM/FC
      Film: WIMA/Panasonic
      Ceramic: Vishay/Whatever you can get

      Signal path, you want low ESR and just replace value for value. Someone of more intelligence can tell you what you can/cannot do in signal path.

      Power supply wise: Get capacitors with the highest ripple current rating you can find. This means how well it can handle dirty unfiltered power. Make sure they are rated for 105C and low ESR really never hurts. I don't know exactly the make up of the supply but that will guarantee prolonged life.

        Comment

        • Th3_uN1Qu3
          Believe in
          • Jul 2010
          • 6031
          • Romania
          #3
          Re: Teac Model 5 recap help

          1975... this is likely to have a linear power supply. Yes you can (and it is recommended to) replace the main filter capacitors (the ones after the rectifying bridge) with the largest values you can fit.

          For the caps after the regulators just replace with the same value, the regs might oscillate with other values. Same goes for signal path. Replace ceramics with poly where possible as poly caps have tighter tolerances.
          Originally posted by PeteS in CA
          Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
          A working TV? How boring!

            Comment

            • TheLaw
              Badcaps Veteran
              • Jan 2011
              • 477
              #4
              Re: Teac Model 5 recap help

              Originally posted by Th3_uN1Qu3
              1975... this is likely to have a linear power supply. Yes you can (and it is recommended to) replace the main filter capacitors (the ones after the rectifying bridge) with the largest values you can fit.

              For the caps after the regulators just replace with the same value, the regs might oscillate with other values. Same goes for signal path. Replace ceramics with poly where possible as poly caps have tighter tolerances.
              Polys supposedly sound better as well. Ceramics have poor electrical characteristics.

              However, sometimes Ceramics are used for high-frequency filtering.

              (How are poly's for high-frequency filtering?)

                Comment

                • Th3_uN1Qu3
                  Believe in
                  • Jul 2010
                  • 6031
                  • Romania
                  #5
                  Re: Teac Model 5 recap help

                  Since there is no switching supply there is no need for high frequency filtering. I'm using poly for a filter capacitor in a class D amplifier (quite a demanding application and usually the job for ceramics), and they do just fine.
                  Originally posted by PeteS in CA
                  Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                  A working TV? How boring!

                    Comment

                    • TheLaw
                      Badcaps Veteran
                      • Jan 2011
                      • 477
                      #6
                      Re: Teac Model 5 recap help

                      Originally posted by Th3_uN1Qu3
                      Since there is no switching supply there is no need for high frequency filtering. I'm using poly for a filter capacitor in a class D amplifier (quite a demanding application and usually the job for ceramics), and they do just fine.
                      I'm not talking about the power supply, rather any other IC that might be in there.

                        Comment

                        • Th3_uN1Qu3
                          Believe in
                          • Jul 2010
                          • 6031
                          • Romania
                          #7
                          Re: Teac Model 5 recap help

                          Not sure what a high frequency IC would be doing in there. LED VU meters (the only thing i can see a digital IC used for in a mixer) weren't common in 1975.
                          Originally posted by PeteS in CA
                          Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                          A working TV? How boring!

                            Comment

                            • TheLaw
                              Badcaps Veteran
                              • Jan 2011
                              • 477
                              #8
                              Re: Teac Model 5 recap help

                              Yeah not sure what would be under the hood....

                                Comment

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