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This makes sense. I'll try cutting down the emi.  I am also using an old dmm probe I cut the end off of.  Thanks

I've built tons of pedals, and thought it would finally be nice to have an audio probe so I don't have to fire up the signal gen and scope.  I made one with the little board available here, and use it as the photo shows.  It works fine, when the probe is touching a component, and in also in bypass.  But- when the probe isn't touching anything, there is a loud buzz.  Is this normal for an audio probe?  do I not have something grounded?  I did initially solder the jacks backward, and when I reversed them I broke the pad off of a connection.  I just ran a wire to replace it.  Same as if the trace was there.

ok, thanks.  I'll look this over

I've got a pretty loud pop when engaging the Florist.  Would I increase the value of R1 (1M) to possibly get rid of this?

Quieter PT2399 was the ticket.  Just a little hiss at the higher blend and volume, but overall sounds great. I didn't build the new board.  Using the existing one.  Thanks for all the help!

thanks for all the replies.  I did confirm that most of the noise is most likely coming from the PT2399 and the board is probably built correctly.  I was running this board in the loop of a new amp (Orange TH30) that I just received.  It is a 12at7 tube driven loop, and the loop itself has a tiny amount of hiss (confirmed this by running a direct cable from send to return) that is being magnified by the PT2399 along with whatever noise it's producing.  I moved the pedal over to my H&K pedal board and it's much quieter.  Both power supplies are fully isolated, but swapped it between then to rule out power issues.  Still has some hiss above about noon on the volume and with blend also above noon.  I have 5 new chips coming this week from PedalPCB, who guarantees they are genuine and factory direct.  Cross my fingers that at least one of them is quieter.  gotta grab a new 12at7 for the loop on this amp too (only type I don't currently have on hand)

thanks.  I have to order some of the parts for the rebuild, and I'm away on vacation next week.  So this will likely be in a couple of weeks.  I'll check back to let you know how it goes.

I appreciate it, but troubleshooting this one has honestly worn me out.  So I ordered the new one today.  After reflowing the points several times (and maybe cooking a component?), verifying all the values against the schematic, changing chips and transistors multiple times, I just need to throw in the towel on this board and build a new one.  I have no doubt it’s an issue I created (maybe I need to not build when I’m really tired) but I haven’t had this much frustration with a build in years.  I did also order 5 PT2399s from GuitarPCB that are guaranteed to be factory direct and genuine.  I’m sure the rebuild will be fine. I’ve built several of your boards over the years and have never had a problem.  Again, I do appreciate all the help.

Just ordered another board. Gonna give it another go.  I really really appreciate all the help with this.

I just went through and verified all my component values against the schematic and they are correct; however, I do have different values for the led resistors (10k for R35 and 1k for R32).  I can't imagine this would cause hiss.

I've gotten them all from Tayda over the years.  I took ones out of other pedals that are working.  I've got low level hiss without the chip in there.  But I do have a low level hiss in one of the other delay pedals that uses two (but it's very low with both of them).  I made that pedal years ago.  I tried those in this pedal and same hiss.  The hiss in the other pedal is low when they are installed.  The florist is low when it's not installed and then loud with it in there.

I installed a new cap in C25.  it took care of the low volume problem, but I still have hiss.  without the PT2399, it's very low.  As soon as I put in the PT2399, it's amplified exponentially.  I tried 4 of them.  All the same result.  I'll go through all the components again against the schematic.  Almost ready to scrap this one, order a new board, and put a new one together.  This one's giving me fits.  I just did 4 builds and this is the only one causing me issues.  I swapped the other chips and put a J201 in place of the 2n5457.  None of them made a difference. (I didn't expect them to)

I have C25 backward.  I'm looking at it while on a work meeting.  Will change at lunch today and try again.

With no PT2399, I have some hiss, seems to be less but definitely still there.  It is there with blend fully CCW and does not change at any position of the pot.

I just tried 5 different PT2399s, including 3 out of pedals that are working fine (admittedly, these are probably from the same vendor, Tayda, but from multiple years).  Also swapped in a J201 to try.  nothing changed.  I have a lot of hiss, actually now that I put the knobs on the pedal, I can see that I have hiss at all positions of the blend (more as it increases, or volume increases).  I guess I'll go through the whole board again and recheck component values.  I haven't made a mistake with them in all my years of building pedals but there's always a first time.