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  1. http://www.oestex.com/tubes/screens.htm

    http://www.oestex.com/tubes/screens.htm
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    Nice build, congrats! Just a notice at first pics...

    Nice build, congrats! Just a notice at first pics sight: if those black piece on the board is a inductor I suggest you to tie it with some plastic stripes on the board, not with a screw bolt through....
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    Edit

    Edit
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    Yes,please. I removed the grid stopper and now...

    Yes,please. I removed the grid stopper and now can put down volume pot without any issue at the end of track.It was a very low noise but still audible close to the end track pot position, The pot...
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    Nevermind, I removed the 10k grid stopper from...

    Nevermind, I removed the 10k grid stopper from input and everything go smooth without any bump noise. Rising the value, I think will go worst as will pick up ripple from ground path. Is interesting...
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    Pot input noise issue

    Hello, I received a certain amount of ripple noise when the volume pot goes down. It started at the end of the track (less above 5 percent to the end, than constantly till the pot is closed). Seems...
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    Thank You gents. I put it everything in back with...

    Thank You gents. I put it everything in back with 220k leaks and 10k stoppers as didn't noticed any differences from a nipples point of view. Thanks.
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    Thanks Dave.

    Thanks Dave.
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    Thank You. No good ?

    Thank You.
    No good ?
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    Those nipple appears exactly in the moment when...

    Those nipple appears exactly in the moment when voltage peak into power grids is identical with dc bias voltage. NFB can be applied either in PI tail or into cathode of previous stage equally as it...
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    No , it is a DC coupled ltp

    No , it is a DC coupled ltp
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    If you take a look on my sketch the first PI s...

    If you take a look on my sketch the first PI s was applied into cathode of the first stage before inverter, which is DC coupled with that. I changed just to check with 100ohm resistor into pi tail...
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    The trace looks very similar with what is happen...

    The trace looks very similar with what is happen there: http://www.valvewizard.co.uk/cathodyne.html.
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    53608 Think is drive enough, the nipple is...

    53608

    Think is drive enough, the nipple is still there, but bigger. The feedback wire is proper routed, tight twisted 4ohm tap through nfb resistor and common directly over shunt resistor...
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    And get the same nipple with almost same amount...

    And get the same nipple with almost same amount of nfb direct into PI tail

    53607
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    And this is without feedback applied: 53606 ...

    And this is without feedback applied:

    53606

    Can someone explain what is going on ? How to apply some nfb without to get nasty artefacts, please ? Thanks
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    Changing grid stopper with 47k, the same results....

    Changing grid stopper with 47k, the same results. Grid leak changed to 100k for confidence.

    53605
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    Get nipples.How can I get rid of ?

    Hello, I.m asking for a solution to get rid by horrible artefacts in my circuit. I remember I read somewhere there are due to overloading of power tubes and it was suggested to raise the value of...
  19. I did a practice soldering sockets wire all the...

    I did a practice soldering sockets wire all the time with the tubes in without to remark any by mentioned concerns, ever. The reason was to keep centered/aligned the socket pins with the tube pins as...
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    And one more question ,please: Is there a...

    And one more question ,please:
    Is there a difference regards nfb in effect between this two situations? It have sense in case of bypassed cathode resistor, but in the situations from my sketch I...
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    Hello, This is how it was settled the bass...

    Hello,
    This is how it was settled the bass preamp section, Ampeg inspired. Maybe can be more tweaked but start to get tired, in every morning seems to sound different, which of course is not. It is...
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    Hey Chuck, Is a clean bass amp, nothing is...

    Hey Chuck,
    Is a clean bass amp, nothing is happen to distort over here. The reason for this amount of nfb is flabby bass reponse with the speakers around.
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    I didn't quite understand something.please. How...

    I didn't quite understand something.please. How comes to much feedback in my circuit ? Except the fact the power stage get clipping more like a SS diode I didn't found any inconvenient. I reversed...
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    And 40 cps/ 125W with Hammond 1.9k, same circuit....

    And 40 cps/ 125W with Hammond 1.9k, same circuit.

    53395

    Think is done. Time to put everything in a box.
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    Holly F..k! Man, this is really...

    Holly F..k! Man, this is really something....functional ?:confused: Seems like a hell of extreme point to point wirring. Expression of Agression. It clearly show how you Mogamy frustration transcend...
  26. Get a Zobel calc

    Get a Zobel calc
  27. Are the output tubes fixed biased? If there are...

    Are the output tubes fixed biased? If there are just check for a defective tube measuring any voltage over each grid leaks resistors. Check also with the standby sw off to see if any voltage is...
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    q.e.d. , with almost 300mA it will be able to...

    q.e.d. , with almost 300mA it will be able to supply 100W around power amp at 450V with an EL34 quad into 1.7k load, no more.(exactly what Marshall 100 did, except the fact there are a lot of...
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