Working now! I took the PCB out of the enclosure to check solder joints, and suddenly it was working when checking with an audioprobe! I think the issue was a short at the back of the stereo potentiometer, I did have insulating tape there, but one of the solder joints must have poked through, and made contact with the potentiometer. I'm using a double-layer of tape now, that seems to have done the trick!Tried out new MCP602 chips today, but no luck - voltages are unchanged.
Will report back if I eventually sort out the issue
Thanks man, think ive got it now. One of the bat48's wasnt seated properly. Jsut need to tune it now!I had the same problem on my build. I had to turn the Gate trimmer almost fully CW to get an effect. Maybe that‘s also the problem on yours.
Yep, Good Catch, R34 definitely 330K , Should be 330 ohm = Orange, Orange, Black, Black. Brown.From a quick glance, pin 4 on your BBD doesn't look right.
Double check R34 there. Looks like you have a 330K? It should be a 330 ohm.
View attachment 14945
View attachment 14946
Yep, Good Catch, R34 definitely 330K , Should be 330 ohm = Orange, Orange, Black, Black. Brown.
It's quite common when a PCB uses a 33 value to see 330 ohm, 3K3, 33K, 330K somewhere on the board!
Same with 47 value, 470 ohm, 4K7, 47K 470K!!!
One bloody colour Band different !!!
Thanks, i had missed that.The pinout of 2SK170 (through-hole equivalent of the 2SK208) is DGS, but the J201 pinout is DSG. I can't quite see from the photos, so make sure you've swapped the Gate & Source pins before placing it in the socket. To keep them from shorting out as you cross them over, you can use a piece of heat shrink tubing or a piece of stripped wire insulation on one lead.
i believe im having the same issue. i think its going to be regarding the gate area as there seems to be no real change to effect atall with that. this is the third ive