[Sathimas]

It's alive !
 

 
Some of you will remember my struggle with the ground wiring and non-defeatable hum.
 
Now I finally had time to install the custum wound transformers I bought in June 2014...
 
 
It's a real dual-mono build now since the transformers are 30-0-30 and 0-9V each.
They also have two different shields, which are not connected atm.
 
 
No hum anymore, just some static hardly hearable with my Musical Fidelity MF200. 
 
 
If this ain't no good start for 2016 :-D

 

[stixx]

Are those the transformers from Rondo Müller?
If yes I am relieved since I suggested them when I recall correctly... I just had a big transformer made by Rondo for another project.

 
Happy New 2016!

 

[Sathimas]

You're right

 

[dBel84]

Congrats, that is a lovely looking amp ..dB

 

[FallenAngel]

  It's alive !
 

 

 
That's so sexy!

 

[FallenAngel]

Hey guys,
 
What's the exact board size?

 

[FallenAngel]

Sathimas : What's that little board in the back?

 

[Sathimas]

Board size see cavalli Audio

The board in the back is an amb e12

 

[FallenAngel]

Thanks, but I haven't found the size on Alex's site.

 

[Sathimas]

Done ...

I'll look up the dimensions

 

[Jrossel]

Done ...

I'll look up the dimensions

 
The Amp boards are 8.5 x 11, sort of like a sheet of paper but in this case it is cm.
The Power supply boards are 4.5 x 11 cm, and the heaters are a thin  2 x 11 cm.

 

[Chs177]

Hello,
 
could you please help or advise me?
I'm building EHHA Rev A boards from GJA kit. I soldered one board and heater is ok, raiil is ok also. I have ~0.04V between out and ground.
I have problem with bias setting, I'm reading 1,06V and -1.06V from TP1 and TP2 to out. I can only can adjust P1 trimpot to higher value not lower.
Heatsinks on board become hot very quickly. I'm reading 29,7V and -29.4V from rail when I just switched power on and 28.7V and -28.4V after 10 seconds.
Here is my board:

 
I checked board and re-soldered it. Nothing is changed.
What I am doing wrong? What I need to check?
Thanks in advance!

 

[FallenAngel]

  Hello,
 
could you please help or advise me?
I'm building EHHA Rev A boards from GJA kit. I soldered one board and heater is ok, raiil is ok also. I have ~0.04V between out and ground.
I have problem with bias setting, I'm reading 1,06V and -1.06V from TP1 and TP2 to out. I can only can adjust P1 trimpot to higher value not lower.
Heatsinks on board become hot very quickly. I'm reading 29,7V and -29.4V from rail when I just switched power on and 28.7V and -28.4V after 10 seconds.
Here is my board:

 
I checked board and re-soldered it. Nothing is changed.
What I am doing wrong? What I need to check?
Thanks in advance!

 
C7 cap looks blown on the top board.
 
Something went very wrong there. Look at it closely for solder bridges.
 
You should also be testing this with the tube installed.

 

[Chs177]

   
C7 cap looks blown on the top board.
 
Something went very wrong there. Look at it closely for solder bridges.
 
You should also be testing this with the tube installed.

Yes, the cap is blown but it's another story.
I checked the board with tube installed for sure and I have bias 450mA.....

 

[FallenAngel]

Is C3 properly installed? It looks weird.
 
Can you confirm R17 value.