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  1. Replies
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    54042 Be careful with the contamination in...

    54042

    Be careful with the contamination in that area. From left to right:
    D12 - diode between EL84 plate and ground.
    R34 - input grid resistor
    R36 - screen grid resistor
    R32/31 - bias feed...
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    613

    I only use it on Vox type amplifiers. I usually...

    I only use it on Vox type amplifiers. I usually install a limiting resistor in series to establish margins for good operation. That way nobody can say "it sounds really bad with the master volume at...
  3. They are not used.

    They are not used.
  4. Replies
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    613

    Is it a 5F8A? In the Bassman 5F6A a conventional...

    Is it a 5F8A? In the Bassman 5F6A a conventional master volume after the treble control works very well. A suitable place is on one of the inputs of the normal channel.
  5. A curiosity: the original power transformer (at...

    A curiosity: the original power transformer (at least here in Europe) has an internal fuse. The good thing is that it has the two points accessible from the outside.
    Once I found one completely...
  6. Grid resistors in each triode are associated with...

    Grid resistors in each triode are associated with the incorporation of the two modules that replace the neon/LDR. This happens in all since they started installing it eleven years ago.
    Have you...
  7. Could it be related to a problem around D6, D7,...

    Could it be related to a problem around D6, D7, R36 and C16? (The group of components between the star earth and chassis)
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    I dīont know if I have understood it well, but...

    I dīont know if I have understood it well, but the voltage in the first and second filter capacitor should be between 425 and 440 volts approximately.
    Visually check if some of the surface mounted*...
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    It certainly requires an appropriate work bench...

    It certainly requires an appropriate work bench ;)

    53790
  10. Ok. TAD supplies in two different ways: one of...

    Ok. TAD supplies in two different ways: one of them is labeled with the relative plate current (PC) and transconductance (orange boxes) and the other simply shows the mark and a number between 1 and...
  11. Which are the EL84 TAD Shuguang? The Chinese EL84...

    Which are the EL84 TAD Shuguang? The Chinese EL84 TADs are the STRs.
    I imagine that if they are Chinese they must be the same.
  12. Replies
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    Sorry. My English is very bad (I dīont ...

    Sorry. My English is very bad (I dīont understand how I have not been kicked out yet). I was trying to say that in my opinion on a basically clean amp the existence of a loop is not very useful...
  13. I have never seen that problem. What I have seen...

    I have never seen that problem. What I have seen is that of the rectifier several times in old units.



    About this problem: there are DSL50/100 and TSL100/122 amps with light green PC boards ...
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    If there is distortion, it is generated...

    If there is distortion, it is generated somewhere. Sometimes at a specific point (a pedal, a amp channel...) and other times in a more complex way along the chain. The overdrive and delay test it can...
  15. I thought that the one I put was a 15, but it...

    I thought that the one I put was a 15, but it must be a 50. In any case, the construction is very similar.
    You could align the contact sheets vertically, apply heat to the welds and pull them. The...
  16. An ideal candidate to cut it and mount a standard...

    An ideal candidate to cut it and mount a standard jack with wiring.
    You will avoid having to disassemble all this ;):

    53712
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    "I wonder if this effects loop thing is to...

    "I wonder if this effects loop thing is to satisfy these bat-humans who can hear miniscule differences (in unimportant places-?)."

    An echo applied to an overdrive is not the same as an overdrive...
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    492

    Good alternative!

    Good alternative!
  19. Replies
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    If you connect a multimeter between transformer...

    If you connect a multimeter between transformer center tap in presence of high voltage itīs very likely that on one of the sides (red-brown or red-blue) you will read strange measurements due to an...
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    Marshall's JMP1 preamp uses one four-pin version...

    Marshall's JMP1 preamp uses one four-pin version on the input. In TAD (Germany) they have it....
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    The noise is totally uniform. It could come from...

    The noise is totally uniform. It could come from a short circuit or leakage between heater and cathode in some preamp tube or in its socket. Inspect them carefully.
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    So is. I've finished exhausted with so much...

    So is. I've finished exhausted with so much measure.
    It would be fun to test how far the intensity rises with 75 Ohms in an EL84 ;)
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    "I have a TH30 here and two of the four EL84...

    "I have a TH30 here and two of the four EL84 operate at lower level than the other two. I have used a new quartet of EL84 TAD and I have measured the intensity directly through the plate in each one....
  24. Thank you very much to all. I went on vacation...

    Thank you very much to all. I went on vacation and after that I had a lot of work. I hope to find a moment to do those tests.
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    I have a TH30 here and two of the four EL84...

    I have a TH30 here and two of the four EL84 operate at lower level than the other two. I have used a new quartet of EL84 TAD and I have measured the intensity directly through the plate in each one....
  26. I do not remember if I said it before: the...

    I do not remember if I said it before: the chassis are made of aluminum.
    The rectification is through 4x1N4007 diodes in bridge (I'll keep that in mind to check them), and the problematic amp is the...
  27. Thank you very much everyone for so many good...

    Thank you very much everyone for so many good information
    Itīs the predisposition of the amp to radiate noise. But 1 meter away with the best guitar orientation (I always use a 5ft/1.5m. guitar...
  28. Many thanks for your explanations and advices. My...

    Many thanks for your explanations and advices. My idea is that the symmetry in these transformers was complete, so there are few or no possibilities, but before disassembling or testing others itīs...
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