Problem mit G2 Tone Pot

    Hallo ich bin Eloi, das ist meine erste mal im diese Forum. Ich spreche nur ein wenige deutsch un wenige im english. Ich habe ein Problema mit mein G2 Amp.
    Ich schreibe mit english, für mich ist bessere:

    I have a problem with the tone pot, I just finished the G2.

    I had one wire from the center terminal tone pot wrong connected (solder to ground). I switch on the amp and is loud. I changed this cable I have checked all the connections and I think all is ok.
    But when I switch on the amp and turn the tone pot to the left (maximum) the sound is ok, bass sound but ok.
    When I turn to the right the tone pot start the noise and don't stop. The noise is with fat, smooth or neutral position, and the minimum volume or the maximum volume.
    I tested the resistance R5, R2, R3 and R6 and are ok. I tested the voltage power transformer secondary

    red vs red, blue vs blue and output transformer primary red vs ground and is ok.


    What can I do?

    Thanks a lot.

    Ola Eloi,

    where exactly did you connect the tone pot before you corrected it?

    What about all the DC-voltages (anodes, cathodes and filter caps) - are they (within +/-10%) as given in the schematic?

    What do you exactly mean when you're writing "The noise"

    Is it really noise (like "ocean" or "rain") or

    is it hum (like a bumble bee = abejorro) or

    is it a single tone = oscilatión?

    Bernd

    Jaichweiß (Andy Pipkin)

    answer

    Hallo Bernd.
    the tone pote have three conectors, one on the left mit resistance, on on the right with capacitor and one in the center. I connected the center conector to the earth and switch on the amp. After I corrected.
    The noise is like a bumble bee, very hight frequenci.
    I cheking the voltage:
    V1b 8 to earth (1V)
    V1a 3 to earth (2V)
    V2b 8 (6V)
    V2b 6 (250V)
    V1B 8 (2V)
    V1B 6 (1V)
    C9 (242V)
    C10 (254V)

    Eloi

    Ola Eloi,

    Zitat

    I connected the center conector to the earth

    - but that's the right way and no error.

    BTW the center connector is called "wiper"

    The oscillation can be a phenomenom caused by bad wiring (a picture of your wiring would help).

    The voltages: There is something mixed up/scrambeled in your listing, pleasedo it again.
    What Mains-Voltage (ATTENTION! AC-voltage) do you have? - The HV seems to be somewhat high.

    Here a voltage plan (you can copy & paste)

    V1-1 (166V): _______
    V1-3 (1,7V): _______
    V1-6 (166V): _______
    V1-8 (1,7V): _______


    V2-1 (237V): _______
    V2-6 (237V): _______
    V2-3 (5V): _______
    V2-8 (5V): _______

    C10+ (240V): _______
    C9+ (227V): _______

    PT-bk-bk (230V AC!): _______
    PT-rd-rd (190V AC!): _______
    PT-bl-bl: 6,4V AC!): _______

    Bernd

    Jaichweiß (Andy Pipkin)

    answer

    Hallo Bernd, I copy my measure:
    V1-1 (166V): ______165.5V
    V1-3 (1,7V): _______1.85V
    V1-6 (166V): _______191V it's difficult to measure
    V1-8 (1,7V): _______0.9 V


    V2-1 (237V): _______248V
    V2-6 (237V): _______246V
    V2-3 (5V): _______5.91V
    V2-8 (5V): _______5.92V

    C10+ (240V): _______248V
    C9+ (227V): _______237V

    PT-bk-bk (230V AC!): _______231V
    PT-rd-rd (190V AC!): _______195V
    PT-bl-bl: 6,4V AC!): _______6.58V


    Eloi

    Hi Eloi,


    Zitat

    V1-6 (166V): _______191V it's difficult to measure

    why is it difficult to measure - is this voltage not stable (DVM display always changing) - Then you should check all connections around V1b

    Fact is, the current through V1b is to low...

    BTW Yuu didn't mix up the position of V1 = 6N2P and V2 = 6N1P

    Bernd

    Jaichweiß (Andy Pipkin)

    anworten

    Hallo Bernd,
    I don't mix que valves, V1=6N2P and V2=6N1P, they are in correct position.
    V1 6 it's difficoult to measure because the tester (display is changing).
    Now V1 6 is 167.1 V fix, without changing.


    Hallo Bernd, I try with the guitar and the sound is the same, noise and hum. The notes of guitar sound very low and with distortion and single tone (oscilation).

    Hi Eloi,

    Zitat

    Now V1 6 is 167.1 V fix, without changing.

    then the voltage at V1-8 should go up, too. Isn't it so?

    But the non-stable voltages can be a indicator for so called cold solder junctions.

    The single tone oscillation can be caused by bad wiring (photos, please - that's not a running joke) - what I didn't expect because the G2 is a low gain amp...

    Bernd

    Jaichweiß (Andy Pipkin)

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