Hi 50pF is good as for the standoffs ; the Bottom ones are female- male standoffs so they have a protruding side that holds the pcb and a second standoff on top connected to it via it’s female side. Then the top panel is closed with a 3mm screw. ill post some pictures of how it’s supposed to look

Here is the full Schematic for the PLL Organ

Due to tolerance issues i can't say for sure that the trimmer voltages on my unit would produce the right notes. so I'd suggest using a tuner to dial in the correct notes. Start from the top right, the highest note and tune it correctly with a tuner, then work your way one note at a time, the keyboard is set as on big incremental resistor that changes it's value according to the key you press. -Adam

Hi, Here re the pin Voltages for the PLL Organ Chips: U5 (CD4046) 1 - 4.7mV 2 - 9V 3 - 0.5V 4 - 9V 5 - 0V 6 - 0V 7 - 0V 8 - 0V 9 - 0V 10 - 0.4V 11 - 0V 12 - 0.7V 13 - 5.1mV 14 - 0.4mV 15 - 4.6V 16 - -9V U6 (CD4040) 1 - 9V 2 - 0.04V 3 - 39mV 4 - 39 mV 6 - 9V 7 - 0V 8 - 0V 9 - 9V 10 - 0V 11 - 0V 12 - 8.8V 11 - 0V 12 - 8.8V 13 - 8.8V 14 - 40mV 15 - 0V 16 - 9V U8 (CD4069) 1 - 4.6V 2 - 1.2V 3 - 1.2V 4 - 9V 5 - 9V 6 - 0V 7 - 0V 8 - 9V 9 - 0V 10 - 9V 11 - 0V 12 - 9V 13 - 0V 14 - 0V U10 (4558) 1 - 4.6V 2 - 4.5V 3 - 4.39V 4 - 0V 5 - 4.5V 6 - 4.5V 7 - 4.5V 8 - 9V

That’s odd ill check the voltages tomorrow and post it here . did You use sockets for all the ICs? -Adam

Hi actually if you say it acts the same with or without the cap it it means that the cap was not doing what it’s supposed to do in the first place. do you happen to have any cap with about the same value you could check in it’s place?

Hi Please check how you have your Master tune potentiometer set wile you're tuning the notes. I recommend seting the master tune knob to zero so that you'll get a consistant referance voltage. (it is just a variable resistor in series wih the keyboard) the 56pF cap is responsible for how low the frequencies of the VCO can be, are you sure it is not 5.6nF by any chance? all the other aspects mentioned should not be directly relevant to the tunning -Adam

You can either use a 100ohm resistor or Jumper the pads . a 100ohm would lower the voltage slightly, If you're going to use regulated power supply then a jumper would be just fine. -Adam

Link Updated, please try now -Adam

These are the order numbers for the second batch, (these orders are planned to be shipped before December 31) orders #10071 to #10116 -Adam

apart from that you'll need the following standoffs and screws - Click This Link

*Please use B100k Dual pot as written in the BOM

Here is an example of a parts list from Tayda - * Use B100k Dual pot for the Filter cutoff conrol https://www.taydaelectronics.com/savecartpro/index/savenewquote/qid/96813283075?fbclid=IwAR2TDBbrGz-Rd-R4o1gUvn6aUIoysAByoLmrRcHxaGSTMroyHED3hUVihQQ

First batch of PLL Organ Kits have been shipped! Preorder of 50 units have been sold out! New preorder will be open in a few days, the PLL product page has a "Notify me when available" button , press it so you'll be the first to know when it's back -Adam