Looking at the schematics, I noticed a few envelope capacitors specified as Tantalum. In striving to be closer to the original circuits and at the request of another member I've put this list together and shared a mouser cart for the parts.
Here is a cart link to the Tantalum Caps I put together. Adds $10 to the build, but you can curb that by editing the master list.
Bass Drum
C8
C9
Low Tom
C21
C22
C23
Mid Tom
C35
C36
C37
High Tom
C98
C99
C100
Let me know if I missed any and I will update the cart accordingly.
Alternative Capacitors "Tantalum" in Bass & Tom Circuits
Thanks for this! You mentioned C153/C154 and C155/C152 in the master section that could benefit from better caps, maybe put a reference for this?
Mouser Part Numbers:beeb wrote:Thanks for this! You mentioned C153/C154 and C155/C152 in the master section that could benefit from better caps, maybe put a reference for this?
555-RFS25V100ME3#5 or 647-UKW1H010MDD
647-UFG1H100MDM or 647-UKW1H100MDD
nice Kazper, I just recently saw a foto of the 909 BD circuit with the tantalum caps and wondered if it's worth swapping.. gonna give it a try 
Had a look at the 909 schematics and it seems you've got all the tantalum caps in your list. Thanks for taking the trouble!
As for the electrolytics, most Roland gear from the eighties uses Nichicon caps, so you can't go wrong with the Nichicon UFG series. I actually used them for all the electrolytics in the Nava main board as most of them have the correct lead spacing and foot print. I used Nichicon UKT and UPW for the PSU caps. They're obviously more expensive, but I'm a nut for audio caps.
As for the electrolytics, most Roland gear from the eighties uses Nichicon caps, so you can't go wrong with the Nichicon UFG series. I actually used them for all the electrolytics in the Nava main board as most of them have the correct lead spacing and foot print. I used Nichicon UKT and UPW for the PSU caps. They're obviously more expensive, but I'm a nut for audio caps.
Thanks a lot for this!Kazper wrote: Mouser Part Numbers:
555-RFS25V100ME3#5 or 647-UKW1H010MDD
647-UFG1H100MDM or 647-UKW1H100MDD
Is the one labelled 33 in the cart meant to be 36?
Obviously. Answered my own question using the original 909 schematic.
am i correct in saying these parts go to the corresponding number or wouldnt any of these work for all 4 numbersbeeb wrote:Thanks a lot for this!Kazper wrote: Mouser Part Numbers:
555-RFS25V100ME3#5 or 647-UKW1H010MDD
647-UFG1H100MDM or 647-UKW1H100MDD
C153
555-RFS25V100ME3#5
C154
647-UKW1H010MDD
C155
647-UFG1H100MDM
C152
647-UKW1H100MDD