Bottlehead Kits > Crack-a-two-a

C2A build Voltage question

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Thermioniclife:
Looks like you should reflow all circuit boards usein more heat and solder to flow through the holes and onto the pads on the top side of the board.All the componants can take te heat except the led's and the small transistors.

Paul Birkeland:

--- Quote from: Thermioniclife on May 17, 2023, 12:21:13 PM ---Looks like you should reflow all circuit boards usein more heat and solder to flow through the holes and onto the pads on the top side of the board.

--- End quote ---

Do this, but maybe don't do it for the LEDs on the PC boards, as they require very little heat to be soldered properly.

TheRedMantra:
Thanks friends. I’ll try to get this sorted once the LEDs arrive. I learned to solder building this kit and it’s been a fun experience. I’m so eager to finally hear what it does!

TheRedMantra:
The LEDs arrived and I replaced the two user errors. They lit right up. The faulty measurements didn't change so I started adding solder to all 3 boards. I backlight them to make sure no light was coming through the connections. Solid. I found two cracked white wires and fixed them up. KregB went to spec at 4.74V and KregA was still stuck at 1.91V.

I reworked practically everything. The KregA value was still the same. I thought why not swap the 6AQ5 tubes? The low value moved from KregA to KregB! KregA is now reading a healthy 4.74V and KregB is 1.91V. Does this mean I have a faulty tube?

For the jack I'm getting some weirdness too still. I don't know if this is because of a bad solder joint or it might be related to the Kreg issue? I'd love some insight on this as well.

Ring - 4V
Tip - 1.2-4.8V and it seems to go up and down and up and down while taking the measurement.
Sleeve - 0V

I want to plug my headphones in! I know the wait will be worth all of it. Thank you all for your help.

Paul Birkeland:
Do not plug your headphones in until your voltages are correct. 

Are you sure you are seeing 4V at the headphone jack and not 4mV?

On the tube swap, it would still be worth checking that the 7 pin sockets don't have any pins touching  or loose connections, as the 6AQ5s are pretty robust.  Still, we can provide a replacement if that ends up being an issue.

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