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  1. Hiwatt DR103 need more bias voltage to new tubes

    Dear,
    I have a hiwatt Custom 100W DR103 70 .
    I add a new power tubes and the bias current is 50mA. I change the bias resistor 47K (-36Vdc) to 220k (-44Vdc). But the bias current
    it is still...
  2. Replies
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    1,459

    The suggested value un datasheet of IC is 24MHz...

    The suggested value un datasheet of IC is 24MHz more or leas.
    https://i.ibb.co/BN5Jcfz/Screenshot-2019-03-03-23-02-21-047-com-google-android-apps-docs.jpg
  3. Replies
    9
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    1,459

    I tried with 24Mhz Crystal and works very good. ...

    I tried with 24Mhz Crystal and works very good.

    I think I'm going to put 24 Mhz. Thanks for help.
  4. Replies
    9
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    1,459

    This time ,the crystal oscillator is physically...

    This time ,the crystal oscillator is physically broken. I tried with a 8.4Mhz 2Pin crystal oscillator and the reverb works but there's a kind of noise that seems phaser. Maybe need more frequency. ...
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    9
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    1,459

    Thanks Soulfetish, I think this schematic is old...

    Thanks Soulfetish,
    I think this schematic is old holy grail. Not a nano version. I don't sure
  6. Replies
    9
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    1,459

    holy grail nano crystal problem

    Dear,
    I have a Holy Grail Nano with crystal oscillator broken.
    I need to replace it. But I can not find the reference of the crystal, and I can not find the original scheme of the holy grail nano....
  7. Behringer DDX3216 with faders problem in LCD

    Dear,
    I have a problem with a digital mixer Behringer DDX3216.
    The all faders only work on the top .
    When you turn down the faders, the LCD loses the fader position and the sound comes and goes....
  8. Replies
    22
    Views
    639

    hughes & kettner Tubeman Transformer Blow

    Dear,
    I have a hughes & kettner Tubeman . This pedal has a transformer inside to convert 12 to 250V ( B+ Voltage of 12ax7)
    This transformer broke down and I can not find a transformer 12-250 2VA to...
  9. Replies
    1
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    965

    Acoustic 370 add power amp in

    Hello,
    I have a Acoustic 370 and id like to add an input of power amp in.
    I want to use one Sansamp as a preamp and connect directly to the PA of acoustic 370.
    Attached a schematic with mod that...
  10. Replies
    12
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    476

    But should the voltage on the plates be higher...

    But should the voltage on the plates be higher than the voltage on the screens?not the opposite as I have
  11. Replies
    12
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    476

    But I have a second Deluxe Reverb silverface and...

    But I have a second Deluxe Reverb silverface and the plate voltage is 415Vdc and Screen Voltage is 415Vdc.
    In this amp the plate voltage is 413Vdc and screen voltage is 415Vdc . Is normal this?...
  12. Replies
    12
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    476

    Deluxe reverb Silverface Bad sound

    I have a small problem with a Deluxe Reverb, it sounds a bit compressed and seems to have little power.
    The bias is well adjusted. But I see that there is more screen voltage than B +.
    I replaced...
  13. Replies
    8
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    907

    Yes , the resistors are ok. Before, when i touch...

    Yes , the resistors are ok.
    Before, when i touch with sonde of oscilloscope in q9 colector or emite q12 or +42 line the sound was clean.
    But now the problem is always.
    Thanks in advance.
  14. Replies
    8
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    907

    I dont know if i put the signak correctly but the...

    I dont know if i put the signak correctly but the measures are:

    TP3 : 41,2v
    TP4: -41,2v
    TP5: 16,6vdc
    TP6: - 16,48Vdc

    TP7: 5mVAC
    TP15: 91mVAC
    TP18: 145mVAC ***
  15. Replies
    8
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    907

    i tested with meter and seems ok.

    i tested with meter and seems ok.
  16. Replies
    8
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    907

    Any ideas ? Thanks in advance

    Any ideas ? Thanks in advance
  17. Replies
    8
    Views
    907

    Problem Fender Frontman 212R

    Hi ,
    ive a problem with power amp in a fender frotman 212R. The clean sound dirty . I think the problem was a U6(TL072) and Q9-Q10.
    I changed a u6 - q9-q10-q11-q12 and q13 and the problem is same....
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    0
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    365

    Marshall DSL 401 Volume OD2

    Hello,

    I have a dsl 401 that I want to increase the volume of the OD2 with respect to the other channels.
    Is there a mod that can install a potentiometer somewhere in the circuit to regulate the...
  19. Replies
    2
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    931

    Marshall dsl 401 volume OD2 mod.

    Hello,

    I have a dsl 401 that I want to increase the volume of the OD2 with respect to the other channels.
    Is there a mod that can install a potentiometer somewhere in the circuit to regulate the...
  20. Replies
    98
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    31,024

    the new MOSFETs that installed had the same gain...

    the new MOSFETs that installed had the same gain 3? were they matched?
    the bias equal in all those transistors?
  21. Replies
    16
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    1,645

    saw the ghost notes occur when the voltage on the...

    saw the ghost notes occur when the voltage on the screens fall of 490V to 420V (full volume )
    It may be that the BY127 diodes (only 0.5A each ) Part of the Problem?. If Changed by IN4007 ?
  22. Replies
    16
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    1,645

    and a choke problem??

    and a choke problem??
  23. Replies
    16
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    1,645

    I tried to install PPIMV with typical A500K...

    I tried to install PPIMV with typical A500K stereo .
    when pot of PPIMV up to 8 , sound ghost notes.
    If the PPIMV below 8 does not happen ghost notes.
  24. Replies
    16
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    1,645

    thanks pdf64. The Frecuency varies with the note...

    thanks pdf64.
    The Frecuency varies with the note played. Link with sound more notes:
    https://dl.dropboxusercontent.com/u/29772200/Ghost%20notes%202.m4a

    (00:00-01:00 ghost notes)
    (01:00-01:25...
  25. Replies
    16
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    1,645

    Yes , Thanks Leo_Gnardo . Now I conect the ground...

    Yes , Thanks Leo_Gnardo . Now I conect the ground to chassis with cathode power tubes and negative of first filter caps. Unfortunately The issue is equal :-(
    I will check ground connections . What...
  26. Replies
    16
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    1,645

    https://dl.dropboxusercontent.com/u/29772200/la%20...

    https://dl.dropboxusercontent.com/u/29772200/la%20foto%201.JPG
    https://dl.dropboxusercontent.com/u/29772200/la%20foto%202.JPG
    https://dl.dropboxusercontent.com/u/29772200/la%20foto%203.JPG...
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    1,645

    I saw the central power tubes don't have 1k5...

    I saw the central power tubes don't have 1k5 resistances. The other two tubes have a 1k5.
    It could be the problem?
  28. Replies
    16
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    1,645

    I tried with a 3 cabinets (4ohm , 8ohm & 16ohm)....

    I tried with a 3 cabinets (4ohm , 8ohm & 16ohm). The problem is same.
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