Is the distortion audible or are you seeing it on a spectrum analyzer?
What do you mean by 'HF Driver'?
Are you implementing any power supply filtering: CRC etc or just Rectifier - Reservoir?
Do you have good, clear photos of the board that is misbehaving?
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hf mean high frequency driver .yes anyone can hear this noise .in other word over high frequency problem .in many amp it is normal and when we increase treble tone it is good but in ax 14 already so much treble and when i increase treble it is over for this amp this make bad sound.without hf sound is good on speaker .i want to reduce high frequency gain in this amp so when i up the tone it will normal.thanks already for suggest.
on that high frequency try a filter cap on feedback resistor from 15pF to 33pF to see if that helps avoid ringing? wait a minute does the AX 14 have a ouput coil and paraller resistor 10R? that can be also why is a unstable a bit "I'm not an expert" but on my AX-11 build I add the coil and resistor and works really well sound really good 
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on that high frequency try a filter cap on feedback resistor from 15pF to 33pF to see if that helps avoid ringing? wait a minute does the AX 14 have a ouput coil and paraller resistor 10R? that can be also why is a unstable a bit "I'm not an expert" but on my AX-11 build I add the coil and resistor and works really well sound really good
thanks everyone i change input ground capacitor 100pf to 4700pf and 220pf in place of 100pf c9 and c10 .it reduce the high frequency distortion but not 100 % .i think this amp need big inductor coil like 20uh or something big to use in hf driver .but this is not real solution need apex sir help.
This amp is generally quite stable and early in the thread it was mentioned that C9 and C10 can be as low as 22pF. Maximum values would be 330pF.
It was also mentioned that the DC blocking cap C1 could be 1uF, but this would more affect LF.
Are you using the base schematic or have you made other changes?
Do you have a crossover on your tweeter (HF) and woofers (Mid) or are you driving the HF directly from the amp?
Are you using a Zobel network at the output of the amp?
hi yes i knew everything regarding any changes in amplifier now i am try best to remove distortion in high frequency
Sorry, but I can't help you out if you won't answer simple questions.
Good luck with it.
Good luck with it.
Afcause I do not want to hitch hike this tread, but you guys maybe do now, why I get high distortion when probe the cascoded long tail pair and also the differential vas has much more harmonics while the output is very low like -90dB. Maybe it is a normal phenomenon but I think it can have much impact on sound quality, like it will sound hars.
for learning I like to now, because not all I do now about, special the paper work and such.
thanks, PS nice amp and thread.
for learning I like to now, because not all I do now about, special the paper work and such.
thanks, PS nice amp and thread.
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Sunny22g my friend have patience keep in mind that some members of diy comunity have diferent local times be patience I have the simulation of the AX-14 I can show you some voltage points also yes go with higher voltage transformer example 38 - 0 - 38 will give you about 50V DC V AC a 200 to 300VA will be enough for the AX-14 "constant voltage of 0.456 mV at the output"if you mean offset is low about 15mV DC good enough ( zobel-bushe ) I add one to my AX-14 in separate small PCB is fine
sure PM your e-mail and I'll send it to ya no problem
yes I called "Golosa" but is just AX-14 with more pairs Best Regards
Juan
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