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EL34 Grid Stopper resistor

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  • #46
    Originally posted by ca7922303 View Post

    What would be best point for ground?
    See trace marked GND
    "If it measures good and sounds bad, it is bad. If it measures bad and sounds good, you are measuring the wrong things."

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    • #47
      [QUOTE=catalin gramada;n954517]Do you have a capacitor at hand, say 22-100n or so?[/QUOTE
      I have a few 10uF 50v on hand.

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      • #48
        Originally posted by catalin gramada View Post

        See trace marked GND
        Got it. Thanks.

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        • #49
          [QUOTE=ca7922303;n954534]
          Originally posted by catalin gramada View Post
          Do you have a capacitor at hand, say 22-100n or so?[/QUOTE
          I have a few 10uF 50v on hand.
          No need it just a short wire from red marking to one of the solder point above GND mark
          Attached Files
          "If it measures good and sounds bad, it is bad. If it measures bad and sounds good, you are measuring the wrong things."

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          • #50
            [QUOTE=catalin gramada;n954536]
            Originally posted by ca7922303 View Post

            No need it just a short wire from red marking to one of the solder point above GND mark
            V6 tube in or out?

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            • #51
              Put the v6 in the socket and power on
              "If it measures good and sounds bad, it is bad. If it measures bad and sounds good, you are measuring the wrong things."

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              • #52
                Are you able to read some voltages in you working amp without to put in endanger yourself ? Just asking...but must be absolute sure...sorry
                "If it measures good and sounds bad, it is bad. If it measures bad and sounds good, you are measuring the wrong things."

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                • #53
                  [QUOTE=catalin gramada;n954536]
                  Originally posted by ca7922303 View Post

                  No need it just a short wire from red marking to one of the solder point above GND mark
                  With jumper wire connected and V6 in or out, there is no red plating, but also no output with V6 installed and jumper wire connected.

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                  • #54
                    [QUOTE=ca7922303;n954551]
                    Originally posted by catalin gramada View Post

                    With jumper wire connected and V6 in or out, there is no red plating, but also no output with V6 installed and jumper wire connected.
                    That's normal to have no output as signal is shunted to ground. It seems you power stage is working allright. You may take the jumper off.
                    "If it measures good and sounds bad, it is bad. If it measures bad and sounds good, you are measuring the wrong things."

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                    • #55
                      Let see disconected nfb wire now if it made a difference. Take the shunt wire you put for test off, and disconect nfb wire.
                      "If it measures good and sounds bad, it is bad. If it measures bad and sounds good, you are measuring the wrong things."
                      • Likes 1

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                      • #56
                        Can you do a bit larger picture of the board? I want go see all components around v6 please, including nfb injection point at el34/r44 junction.
                        "If it measures good and sounds bad, it is bad. If it measures bad and sounds good, you are measuring the wrong things."

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                        • #57
                          Originally posted by catalin gramada View Post
                          Are you able to read some voltages in you working amp without to put in endanger yourself ? Just asking...but must be absolute sure...sorry
                          What voltages do you need?

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                          • #58
                            Originally posted by catalin gramada View Post
                            Let see disconected nfb wire now if it made a difference. Take the shunt wire you put for test off, and disconect nfb wire.
                            Can you point me to nfb wire? Thanks

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                            • #59
                              Originally posted by catalin gramada View Post
                              Can you do a bit larger picture of the board? I want go see all components around v6 please, including nfb injection point at el34/r44 junction.
                              1 Photo

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                              • #60
                                Originally posted by catalin gramada View Post
                                Are you able to read some voltages in you working amp without to put in endanger yourself ? Just asking...but must be absolute sure...sorry
                                Good on taking voltages.

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