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  1. secondary emission is a byproduct of fairly low...

    secondary emission is a byproduct of fairly low anode voltage ,especially on modern production tubes,if its annoying try add a 100n and another 1M to ground to block any leakage.
    I've seen several...
  2. Try feeding the preamp tubes heaters with...

    Try feeding the preamp tubes heaters with 6VDC,even a switching supply is ok,and report if it changes some way.
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    You probably have a 4n7 cap with a 100k in...

    You probably have a 4n7 cap with a 100k in parallel,just replace that resistor with a 1M audio pot
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    not much mistery,jacks go bad,oxidation first...

    not much mistery,jacks go bad,oxidation first problem,or bad solderings both on the jack or the ground reference
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    yes,the last one,never understood why people are...

    yes,the last one,never understood why people are afraid to turn knobs....
    one reason can be because of the different topology,the BF module has more loss after the tonestack than a Vox/Marshall and...
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    1meg in series with a grid....bad idea i guess...

    1meg in series with a grid....bad idea
    i guess in boost mode it becomes a feedback,so less noise.
    sometimes there is stray capacitance that couples rectifier buzz through the filament in...
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    https://www.tube-town.net/ttstore/tt-custom-shop-c...

    https://www.tube-town.net/ttstore/tt-custom-shop-chassis-data-service.html
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    Sorry,brownsound Is out of business,asked around,...

    Sorry,brownsound Is out of business,asked around, there's another company doing custom stuff,I will give you a link.
    As far as transformer,Inmadout is active.
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    try emailing the guys at brownsound.it,they can...

    try emailing the guys at brownsound.it,they can make custom stuff,iirc.
  10. i would check out the dual supply for the...

    i would check out the dual supply for the opamps,especially on U1,that is notorious for problems in all the budget Fender amps like the hotrod,and wiggle all the flat cables connecting the boards,it...
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    this site has most of the good practices in tube...

    this site has most of the good practices in tube amps
    http://education.lenardaudio.com/en/14_valve_amps_4.html

    For education purpose i find that any old book by RCA GEC Radiotron etc has most of...
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    not exactly a new thing ,Marshall major had the...

    not exactly a new thing ,Marshall major had the cathodyne and the gain stages after to 4 KT88s.
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    Here they are

    Here they are
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    I have seen it, I'll dig the hard drive

    I have seen it, I'll dig the hard drive
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    https://music-electronics-forum.com/showthread.php...

    https://music-electronics-forum.com/showthread.php?t=36027&p=542231&viewfull=1#post542231
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    i would get a 2 way active crossover and separate...

    i would get a 2 way active crossover and separate power amps, so you can assign an adequate level to the tweeter.
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    do you mean there is only the gain channel,not...

    do you mean there is only the gain channel,not the clean one?
    i have a Competition schem ,it should be like what you have,can you post a couple pics of the preamp part?
  18. old fuse blows sometime,but when you replace it...

    old fuse blows sometime,but when you replace it its sorted out,then it can be a shorted rectifier,faulty main capacitor,defective HV secondary.

    just use a bulb limiter in series with mains voltage.
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    bias voltage -75v means the amp is in standby,to...

    bias voltage -75v means the amp is in standby,to get proper bias you need to plug an input jack and a speaker or load in the output jack,then you are in play mode
    it is normal to have signal on v1...
  20. there should be another sheet with switching...

    there should be another sheet with switching logic,if you need that i'll look around
  21. i use chrome,weird

    i use chrome,weird
  22. i have these,take care because chinese schematics...

    i have these,take care because chinese schematics always have some error.
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    power stage is a chip attached to the...

    power stage is a chip attached to the fan/dissipation assembly.
    Try discerning the problem by using the send and return jacks,the cd in and headphones,hear what you get
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    55422

    55422
  25. 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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    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...
  27. 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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