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ReVox B260's de-emphasis; change from European 50us to US 75us?

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    ReVox B260's de-emphasis; change from European 50us to US 75us?

    Hello world ReVox experts:

    Unlike B261 the de-emphasis time constant for ReVox B260 seems to be fixed at factory: US version v.s. European version. Which components are responsible for such change? C203/C201 (22uF) and R273/R273 (47k Ohm)? And what would be the values for 75us US version?

    Yeun-Jung Wu

    #2
    Zitat von b0190 Beitrag anzeigen
    Hello world ReVox experts:

    Unlike B261 the de-emphasis time constant for ReVox B260 seems to be fixed at factory: US version v.s. European version. Which components are responsible for such change? C203/C201 (22uF) and R273/R273 (47k Ohm)? And what would be the values for 75us US version?

    Yeun-Jung Wu
    STUDER A764 service manual reveals two separate boards: 1.726.350 for 50us; 1.726.352 for 75us.

    1.726.350 (50us): R272/R273: 47k-Ohm; C200/C202: 3.3nF; C234/C235: 330pF

    1.726.352 (75us): R272/R273: 56k-Ohm; C200/C202: 4.7nF; C234/C235: 470pF


    Yeun-Jung Wu
    Zuletzt geändert von b0190; 31.01.2021, 21:55.

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      #3
      There are two 150pF capacitors C261 and C261 under the board. C260 is parallel with C232 while C261 is parallel with C237. It makes 470pF+150pF = 620pF for C232/C237.

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