Thanks Wyatt!!!

Here are my readings, tubes loaded, speaker load in "operate" mode:

V1
1- 163   VDC
2- 0
3- 1.7   VDC
4- 3.15   VAC
5- 3.15   VAC
6- 185   VDC
7- 0
8 -1.65   VDC
9 - 3.15   VAC

V2
1- 174   VDC
2- 0
3- 1.7   VDC
4- 3.15   VAC
5- 3.15   VAC
6- 186   VDC
7- 0
8- 1.54   VDC
9- 3.15   VAC

V3
1- 270   VDC
2- 0
3- 57   VDC
4- 3.15   VAC
5- 3.15   VAC
6- 260   VDC
7- 0
8- 57   VDC
9- 3.15   VAC

V4
1- 55.2   mVDC
2- 3.15   VAC
3- 424   VDC
4- 422   VDC
5-   -33   VDC
6- 422   VDC
7- 3.15   VAC
8- 55.2   mVDC

V5
1- 54.7   mVDC
2- 3.15   VAC
3- 423   VDC
4- 425   VDC
5-   -33   VDC
6- 423   VDC
7- 3.15   VAC
8- 54.7   mVDC


After speed-reading the OTS topics, i tried swapping the Output transformes Primary wires on V4 and 5, Pins 3, and it got lot more quiet!!!     

I mean silent, with sporadic noise..... the noise is very close to the interference that the probe does while touching some of the tube's pins.... i haven't tried plugin my guitar, but i'lll eat something first.....

Is there anything to worry on these readings, wyatt?

I have sound also noise    

Should i start to diagnose with an audio probe? where should i start?


I made a short audio with the noise... can you tell by what it sounds what it might be? Is it safe to keep running longer time?

The volume or any other pot doesn't interact with the noise. It's always there

 Checked most solder joints, reflowed some just to make sure... no difference.

The Bias pot all the way down reads more than 50mV on V5 and more than 40mV on V4 !!  I always keep it on for less than 3 minutes


I'm going to try chop suey test, and if no result i'll resolder V4 and V5

Thanks again waytt!
 
If any thing comes to mind, let me know

In fact i didn't grind any ground connection to the chassis.... how noob is that? The chassis has no paint finish, showed continuity, so i didn't bother.

Instead of taking out screws and grind, i filed the chassis right beside the screw and solder a jumper to it. Did all the ground connections, plus the bias pot cover and Od Trim (this pot has lug 3 connected to ground, but i assume it's no problem).

The result was a very silent powerup but in less than 1 minute, the noise started to volume up; had a multimeter connected to bias probe V5. during this minute value raised from 20mV to 40mv....

Should i ground V4 and 5 Sockets to ground too?

Thanks again

I think i have the problem solved 

I would like to thank you wyatt, for patience, help and support! Without your feedback, i would have take it to a tech long ago...

.... Inspected, reviewed and rechecked most solder joints and ground connections. Everything was ok... The last thing before i take to a tech, was replacing power tubes.

Amp came out alive and well no noise, wonderful sound, everything 100%. Biased the used 6l6's (32mV-V4 39mv-V5), tuned PI trimmer to 6VDC difference and FET board trimmer as well, everything ok. Played for an hour or so. Stable voltage readings everywhere, no noise.

Then replaced the tubes with the new ones again. Noise again. So, i think i have solved the problem.

Now, one thing puzzles me : Tried the new 6l6's in my Cornford Roadhouse 30 (from where the used ones came). No noise, even in high volume.... Only blue light and extra heat was noticeable.
The new tubes look good and new from the outside.... How can i test/make sure that these tubes are faulty? A tube tester is the only way to go?

As for the OTS, i'll try to describe it in another post maybe.... I've played several amp models of brands like Fender, Marshall, Vox, Mesa, Soldano, Cornford, Orange, Bogner, Egnater... The OTS doesn't have all the best or signature sounds from the previous, but it's far superior IMO !!! Versatile, flexible, dinamic, transparent, powerful, detailed. And topping that, it has all the features for Gig and Studio work!

Thanks Wyatt for all the help

Mr. Nick too, for a huge contribution to the guitar world!!!

I couldnt even set a stable voltage for power tubes. They kept rising from 20mv to 50mv, and more, in less than 2 minutes...  Even though on Conford they were very silent, they got very hot in less than 5min.

These were identical to those i have on Cornford, they fitted the same way... Tube sockets don't seem to be the problem

I Have a Fender Super Sonic, gonna try those 6l6's there.

Both of them went to see the doctor today http://www.orangeamps.com/products/accessories/amplifier-management/vt1000/

And they are both working, but 3 of 4 grades apart. Not paired at all.

Bought 2 new tubes at the store. JJ 6l6GC, same thing. I'm doing a shootout with them

I know the JJ 6L6GC's have been getting a reputation lately for having a lot of mechanical rattles. These are sounds you can hear form the tube, but aren't amplified as part of the circuit. Some people are getting fed up with it.