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  1. Replies
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    690

    then why people go buying a high powered amp if...

    then why people go buying a high powered amp if its too loud?
    he could have gone 5e3 or another tweed model.
    You can go MV,pre or post PI.
    Or a simple scaling in the PI bias resistor.
    I guess...
  2. IC caps...if one fails it can easily lead to...

    IC caps...if one fails it can easily lead to feedback.
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    119

    You can, just respect polarity,and since they are...

    You can, just respect polarity,and since they are floating and maybe you don't use the main cable,just give a ground reference to chassis to avoid noise.
  4. filter caps

    filter caps
  5. What was the noise,was it a specific frequency?...

    What was the noise,was it a specific frequency?
    This circuit is a bit different from what you find in most amps,when you are in standby,the B+ is not zero Volts and the bias is -80V,around that,so...
  6. Replies
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    280

    This is the new disposable series,I don't think...

    This is the new disposable series,I don't think it's possible to repair if smd parts are burnt,no scheme.
  7. Replies
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    266

    the last one,i did it myself with a GTO,i used a...

    the last one,i did it myself with a GTO,i used a normal 12V/2A external brick to the jack on the box,internally connection direct to the heaters in parallel and to the HV boost converter,It works...
  8. Replies
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    897

    I would try elevating the heater center tap. One...

    I would try elevating the heater center tap.
    One trick that was used in the old single ended radios,was the output transformer,that had the primary with a tap around 90%,to which the plate went...
  9. lets say that the 2 grid resistors burned out...

    lets say that the 2 grid resistors burned out first,just because they are very low wattage and maybe there is some hot trace underneath or the screen resistors,if they break you dont have any...
  10. Replies
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    900

    my way,i use some teflon grease on the nut(which...

    my way,i use some teflon grease on the nut(which has to be cut and sanded perfectly),on the string tree,on top of the saddles and remove the sharp angle on the 6 holes in the plate.
    There are...
  11. Replies
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    900

    Galeazzo Frudua videos on YT

    Galeazzo Frudua videos on YT
  12. The only way is to apply a high dc voltage on one...

    The only way is to apply a high dc voltage on one side,and measure on the other,it should be less than a volt.
    You can just install it in place and measure in circuit with no power tubes,if on pin 5...
  13. Replies
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    462

    i suggest to change all filter caps anyway,they...

    i suggest to change all filter caps anyway,they were not so good back then and they are already old,plus you don't want to change them one at a time in a pcb board made like that.
    Shotgun method,its...
  14. what i find very stupid in these low cost...

    what i find very stupid in these low cost amps,but in general in all the modern production where engineers think they are going to simplify the whole "tubes" experience for everybody,by introducing...
  15. Replies
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    355

    these amps are made to be disposable,i mean,if...

    these amps are made to be disposable,i mean,if there is a problem the official service guys toss the board and sub a new one.
  16. Replies
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    159

    i have a tonecat reverb somewhere,it has both...

    i have a tonecat reverb somewhere,it has both el84 and el34,and reverb circuit,if youre interested i can find it.
  17. Replies
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    378

    to work on those boards,you need to solder and...

    to work on those boards,you need to solder and desolder in the fastest way possible,that means you need enough power,especially on ground planes,i use 48W minimum,today you can find even a bargain...
  18. Replies
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    384

    bias voltage,thats all

    bias voltage,thats all
  19. pots in these are very inexpensive,i had to...

    pots in these are very inexpensive,i had to replace the gain once.
  20. Check all the tube voltages,then you will...

    Check all the tube voltages,then you will understand what is working or not
  21. caps are microphones,so yes,you need to avoid...

    caps are microphones,so yes,you need to avoid running grid wires near them,and maybe use some quality film or multilayer ceramic.
    50Hz hum is mainly heater induced or a bad grounding point or a bad...
  22. Replies
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    What works fine,doesn't need to be fixed,if one...

    What works fine,doesn't need to be fixed,if one day you here a big loss of power,its time to change power tubes.
    Internet is full of wannabe experts of nothing.
  23. Yes,do not use gz34,use a 5y3 but not a Sovtek....

    Yes,do not use gz34,use a 5y3 but not a Sovtek.
    If the current is still high,try a 330 or 390 ohm.
  24. Replies
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    Sticky: Vox TB35C1...

    Vox TB35C1
    http://dealers.korgusa.com/svcfiles/TB35C1.pdf

    Vox TB18C1
    http://dealers.korgusa.com/svcfiles/TB18C1.pdf
  25. Replies
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    try using the loop in and out to determine if the...

    try using the loop in and out to determine if the problem is the preamp or poweramp
  26. Replies
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    check out all the voltages on tubes,referred to...

    check out all the voltages on tubes,referred to ground,probably filter caps need replacing and some string supply resistor went south.
  27. thanks to all for the replies,my only concern is...

    thanks to all for the replies,my only concern is about preamp tubes,i know about the power tubes,i had once to reflow a heater pin on a 6L6 used,with success,but if i need to reflow the sockets on a...
  28. Soldering sockets with tubes on ,yes or no?

    I like to prototype circuits on a chassis with some sockets,point to point style,soldering components directly on sockets and pots,no tags and long leads.
    I wonder,when i make changes to try...
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