Magnetron delay ground hum(?) issue

[Tramey345]

I recently built a graviton delay but I’m having issues with what I think is some sort of ground hum. With no power applied, I get clean bypass with a slight hum and nothing passed when active. When I apply power, I get a pretty strong hum over my clean guitar signal and then when I activate the pedal I can hear my guitar and delay but there’s still a pretty evident hum

 

[Nostradoomus]

pictures are much more helpful than words

 

[Feral Feline]

Really well-lit pictures, so resistors' colour-bands are shown clearly; ALL connections shown clearly;
pics front and back of the PCB are clearly needed.

Without pics...

HAVE YOU...

CONFIRMED all resistors are the correct values? Ex [brown red black black brown] vs [brown black black red brown]​

CHECKED ALL solder-joints and reflowed any suspect joints ie anything: with cracks, dull, non-conical ...​

COMPLETELY traced the signal-path with an Audio-Probe​

CORRECTLY inserted the cables — when the pedal's upside down it's not uncommon to plug into the OUT and come out of the IN​

CONSULTED trouble-shooting stickies...​

​

Well, that's a start.

That thing about plugging into the OUT ... that often gives the symptoms you've described: weak output with hum.

 

[Tramey345]

Here’s a picture of both sides of the pcb. My wiring is slightly a mess because I was trying to add a ground jumper to see if that helped at all. I think all resistors are correct other than r20 and r25 because I didn’t have 120k so I put in 150k and socketed them. I have tried switching my cables between in and out to no success. I have also tried to reflow all joints to make sure all connections were solid

 

[JohnnyCreepy]

I’d remove all outboard connections. Then look build doc wiring guide, follow it precisely and trim wire lengths short as possible. Now you have extra connections between grounds and wires are so long they could act as hum picking antennas.

After that lets dive into component values?