I use 6H30 which i find to be more dominant(powerful) than the 6DJ8. Can we have a picture of or heater shielding?:)

there is some, just an "extra" bit, you should try it out, u can leave it on minimum on one channel and remove it completely on the other.   have u rolled any tubes?

I assume u removed nfb?

meaning construction or improvement ?:)

only thing i cn suspect is faulty mosfets , however just to be sure can you also mesure the ac output voltage of the transformer as well as dc voltage between tube pin 3 and ground. just have ur meter ready, turn on get a mesurement turn off. dont replace the burned resistor, it doesnt matter...

  can u put tome quality pics of both the back and the front of the psu boards?

You should not really be worried abt the mosfet being cooled. I have mine on the original position next to the tubes in an enclosure with little airflow and well they work fine. Stability is more abt "constant" heat than being cool ( assuming ur in the working temp range).   Any way, no if u...

Stupid me one of the heaters of the ecc99 was not connected...:@

Suddenly one channel stopped working:S   The problem is around the ecc99 circuit. Pin 1,2,3 of the ecc99 measure ~220v were pin 3 should have been ~120v. Pin 8 of the tube is at 0v instead of 2.2v. I changed the tube with a working one and still the same. Any idea which component might have...

if you got any high voltage diodes around you can use them instead of the ps tube:)

stupid me... cold connection on the heater pins. thanks for the idea :)

measured the the coupling caps (c3 c4) they are fine. also checked pin 1-2-3 and they are not shorted, any other thoughts?   also tried changing tubes. same problem

got another problem again. i left the amp for quite some time on and one of the channels stop working, i feared it was the tubes so i interchanged them and still got no sound. i measured pin 1 - 2 -3 of the 6dj8 and they were all the same voltage , 184v i panicked . any idea whats causing this

noticed that on one of my psus under load the maximum voltage i can get is ~245v  the other runs fine at 250v sharp. checked input capacitors they are fine   any idea what maybe causing this? can it be the transformer?

will check the tubes as soon as i go home, i thought that the extention cable of the tubes may picking up noise i moved the tubes around and i get no difference so i guess i can rule that out. i get noise / hum on the left channel ( balanced amp btw) which is not affected by changing the...

tried everything i could thing of, even a steel sheet (3mm thick) on top of the transformer did not help. any other suggestions ?

ive connected earth to chassis , noise still there. amohead mod tomorow since i need the resistors, anything else i can try? or my only chance is moving the amp further appart from the psu?

the trabsformers are r core, there is one under the left channel and one under the right , no the star g is not connected to earth. should i try ampheads mod?

  the tubes sit on top of the board that's why the extension wires. Also just tried the J1 connection and it didnt work. after the amp is left to complete cool down also the right channel experiences hum, 1-2 minutes powered up and the right channel hum dissapears

Experiencing hum in only one channel, balanced setup, psu in separate box. When the amp is on top of the psu i get hum in the left channel (right its fine) when i move them further away the hum disappears, any idea what to do?

nice build :) try routing your wires a bit better though :)

Personally I used an alps attenuator which also has a motor on it. there is also a more audiophile grade model without the motor. Dact is also another choice. This attenuator from part connexion can be taken into consideration. The reason I used the alps one was because it was easier to source...

wow nikon very clever technique :)   as for my tube balancing quest, it seems more "correct" for the tubes to be balanced but as u guys explained lots of trouble with minimal gain

so matching them myself would be the best way right? any easy way of doing it no scope or signal generator here :/

Guys any shop which sells perfectlu matched tubes?