Testing with tubes terminal 7 read 1vdc instead of 170-230

[DPetrini]

OA 13mV.  OB 8mV.   Before the final Reading the voltage fluttuante up to about 25mV

[Paul Birkeland]

What are IA and IB now?

[DPetrini]

Both measure to iec ground are 468 vdc
No tubes in of course

[Paul Birkeland]

Something is very likely not well soldered on the PC board.  Can you take it out and show us the bottom side in better detail?

[DPetrini]

Sure. See enclosed. What about if i get off all components ,clean It and reinstall new batch of 4 transistors? I have received them today from local supply

[Paul Birkeland]

Are you using lead free solder?

[DPetrini]

I think its a very old kester. I finished It and Will now use weller Just arrived a couple of drops of the weller were used on this pcb i think when i reflow the soldering yesterday

[Paul Birkeland]

A very hot iron and low dwell time works well for the boards, but not enough heat will lead to flux building up between the solder joint and what it's supposed to solder, and you can end up with weird issues like this that don't make a ton of sense.  The exception is the LEDs, which have so little ability to dissipate heat that they solder very quickly.

[DPetrini]

So what do you advise please?

[Paul Birkeland]

I would reflow every joint on that PC board other than the LEDs.  What you have is not consistent with a transistor failure.

[DPetrini]

I am cooked as well. Reflow all,still not working. What if i dismantle It almost completely and start from scratch? Will you accept order for a list of components or out of your scope and should buy them locally?thanxs and apologize for not being a good fellow that makes things right First Time.

[Paul Birkeland]

You can contact replacementparts(at)bottlehead(dot)com about getting a replacement PCB and parts for your Stereomour.  Some 60/40 leaded solder and a soldering iron set to 800+F would probably help too. The old Kester should work well provided it's leaded (not silver bearing).

[DPetrini]

Thanxs! The solder station Is decent at 65w. Ordered now 60/40 Classic lead no silver. I want to make It working this time. Will check continuity or resistance at each soldering parte. Sent mail to your ref mail to ask offer quote. Cheers

[DPetrini]

Dont think Will finish this amp. From thursday last week ,when i wrote for replacement parts,nobody took care of me.  Not what i expected, honestly

[Paul Birkeland]

I will have Eileen check in the spam folder.  Our e-mail service isn't always the best at proper filtering.