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  1. Replies
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    55422

    55422
  2. If the amp has also a distorted channel always...

    If the amp has also a distorted channel always running and just switched out,it can be radiated on top of the clean,in general it should be grounded at some point.
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    343

    the power section on that schematic is the exact...

    the power section on that schematic is the exact same of the 100w models MTS and legacy,i bet its less voltage in reality,more like 350/400V on B+ which is more appropriate for el84s,,that explains...
  4. anywhere over 400V on screens is too much and...

    anywhere over 400V on screens is too much and won't give more power,plus you have even more differential between pin 4 and 5.
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    try a slow blow,inrush current can easily blow...

    try a slow blow,inrush current can easily blow the fast one.
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    850

    Yes the original post has been moved to another...

    Yes the original post has been moved to another section
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    850

    Blackstar Stage HT60

    disconnect all the main PT secondaries and start powering through a bulb limiter in series
  8. Replies
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    I have a 4211 on the bench right now, basically...

    I have a 4211 on the bench right now, basically it's the 100w version,if you need help I can give you measurements and values.
    The boost channel is not the best I've heard on Marshalls,that was one...
  9. That was just my little opinion and you shouldn't...

    That was just my little opinion and you shouldn't get it too personal,i know there are fanboys of some high end products and brands,that's ok,but getting angry like that in defense of a low cost...
  10. you forgot the pills,again.

    you forgot the pills,again.
  11. i think this user fingerpicking needs to be banned

    i think this user fingerpicking needs to be banned
  12. bravo

    bravo
  13. you gave me a thumb down for which reason?

    you gave me a thumb down for which reason?
  14. Replies
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    well,that happens the most on inexpensive...

    well,that happens the most on inexpensive amps,where you know the company had to cut corners somewhere.
  15. The guy is too busy with the...

    The guy is too busy with the PlayStation,seriously,I'm not joking
  16. its the same old Dana Hall VVR that everybody use...

    its the same old Dana Hall VVR that everybody use with different fancy name,because they "engineered" a special way to control the amazing power of their cathode bias amps,in house,in the full moon...
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    311

    CRT all the way. Good digital scopes start over...

    CRT all the way.
    Good digital scopes start over 300.
  18. Replies
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    442

    If the signal on power tube grids is ok,i'd say...

    If the signal on power tube grids is ok,i'd say the OT is toasted.
  19. The usual place of standby is just plain wrong,as...

    The usual place of standby is just plain wrong,as well as it's typical rating,there are better ways to implement it and take the flyback spikes around.
    Usually Carvins used a 47n cap across to tame...
  20. Engl amps are all biased cold,by design. Do they...

    Engl amps are all biased cold,by design.
    Do they sound bad?No
    Case closed.
    As JM stated,the board is for advanced techs with proper tools,leave it alone if its not broken.
  21. just leave off two tubes and measure voltage...

    just leave off two tubes and measure voltage again,what do you see?
  22. turning up the bright volume you isolate the...

    turning up the bright volume you isolate the combo 470k/500pF from ground,i guess that is the main cause.
  23. try with normal 1N4148 diodes and see what you get

    try with normal 1N4148 diodes and see what you get
  24. Replies
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    1mA is normal in 6l6 type tubes,in el34s is more...

    1mA is normal in 6l6 type tubes,in el34s is more like 5,the screens start to draw more when overdriving the power amp,in triode mode its different,they tend to be stressed more,especially with high...
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    DC resistance is often different between the 2...

    DC resistance is often different between the 2 windings,but you should check inductance and for potential short windings.
    Try reversing the taps to see if it's the OT Or something in the bias...
  26. Replies
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    That is the waveform of a single tube,the other...

    That is the waveform of a single tube,the other is not conducting at all
  27. with gain on 2 and master on 5/6 the amp is...

    with gain on 2 and master on 5/6 the amp is clean,if its too dark just add bright cap on the 1M before the gain pot,for less gain put a 100k in parallel of gain pot.
  28. Replies
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    http://www.valvewizard.co.uk/Common_Gain_Stage.pdf...

    http://www.valvewizard.co.uk/Common_Gain_Stage.pdf
    this amp is 4 stages plus CF so very high gain,whatever tube you use.
    I have seen in a similar model they used a first stage cathode with...
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