Receiving Feedback through my headphones, looking for advice [resolved]

[pierrot]

Hi All,

I'm back to troubleshoot my issue.

In the previous thread  (https://forum.bottlehead.com/index.php?topic=12150.msg110974#msg110974) the issue resolved itself for about a few days and then it started to play up every now and then, then got worse as a week went by.

Now there's a staticy noise a few moments after you turn on the amp

Steps I've taken previously - checked voltages are correct, resoldered everything with 60/40 rosin flux lead solder

I did not use any additional flux when resoldering

Thanks for the assistance!

 

[Paul Birkeland]

Some joints that I see that are dry are one leg of the 2N2222 (looks like the one closer to the front of the chassis) and the holes where the 270K 1W resistor goes through. 

Adding a little more leaded solder to a lot of these joints should help a lot.

 

[pierrot]

Thanks Paul!

I'll report back when I'm done

 

[pierrot]

Hi Paul,

I resoldered the joints you mentioned. The high pitched intermittent screech has gone away but I also have a low hum in the right headphone and the volume is a bit lower than the left.

Could you please help me

thanks!

 

[Paul Birkeland]

Reflow all of your solder joints, both on the board and in the stock build.  Definitely add a bit of leaded solder as you go.

 

[pierrot]

it seems like everytime I resolder, I create a different error haha.

the amp is 98% fixed but I can hear a very low hum in the right headphone.

I assume I just need to keep reflowing and resoldering one thing at a time to fix it

Also, could it possible that I soldered on the wrong voltage?

I believe the wiring guide had 235 and 245 but my voltage was around 240

 

[Paul Birkeland]

If things keep changing every time you resolder your joints, that's a good indicator that you still have a joint that isn't quite right. 

If your DC voltages are correct, then you have chosen a suitable wiring configuration for the incoming mains voltage. 

-PB

 

[pierrot]

Alrighty,


Thanks for the help Paul

 

[pierrot]

good news,

Finally fixed it!

There was actually a bad solder point that I kept missing because it was difficult to see near the volume knob

thanks for all the help Paul!