Bottlehead Kits > Kaiju Stereo 300B amp
Issue with A Side C4S Board A [resolved]
Paul Birkeland:
I would try reflowing the solder joints on the MJE5731A transistors. You'll know when they are heated enough because the solder will wick through the board to the other side.
giggsy:
I reflowed the solder on all the transistors. Still getting the same reading.
Paul Birkeland:
If the blue trim pot is turned to be 0 ohms, you'll get the voltage that's across the R3 resistor that's next to it. You have reported this as 2.47V, but you haven't gotten that at your Kreg output.
I suspect either the Kreg to Breg wire has an issue or you aren't turning the pot ten full turns.
giggsy:
You are quite right to question my counting skills :) but my screwdriver has marking on one side so pretty sure I did it right this time.
I redid just in case but got the same result.
The reading at BREG and KREG are the same so guessing the connection is ok.
Is there anything to be gained from switching the boards over?
Paul Birkeland:
Sure, you could swap the boards side to side to see if the issue follows one of the boards.
What I would suggest though is to set your meter to read impedance, then attempt to adjust the blue trim pot so you see 0 ohms between Kreg and the "R" pad on the 431. You can do this with the amplifier off.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version