This thread is intended to be a place to discuss the balanced and unbalanced output versions of the stereo phono preamps as well as the Devinyliser designed by Doug Self and sold as boards only via The Signal Transfer Company website.
Website description: “The Signal Transfer Stereo Phono Preamplifier is a stand-alone version of the phono system used in the Precision Preamplifier. It offers both moving-magnet and moving-coil inputs, the latter with two gain options for optimal performance. It gives extremely accurate RIAA equalisation, a noise performance that approaches the theoretical limits, and superb linearity.”
No parts kits are currently available, according to recent correspondence with Mr Self.
Balanced output version: http://www.signaltransfer.freeuk.com/RIAAbal.htm
Unbalanced output version: http://www.signaltransfer.freeuk.com/RIAAunbal.htm
Devinyliser: http://www.signaltransfer.freeuk.com/devinyl.htm
Mr Self has taken over managing the website and fulfilling orders. He has been very responsive and the boards were received quickly.
I’m impressed with the build quality of the boards. Most of the parts are easily sourced using the BOM provided in printed documentation (or perhaps you will get a pdf) with the boards by searching for the values needed at your preferred supplier and verifying the part you choose has the correct lead spacing to match the board.
He does have a supply of the 2SB737 low noise transistors that he sells, tests each first and ships.
It took some digging and help from other diyaudio members to source a few of the parts.
Pending:
BOM with parts numbers from Digikey, Mouser, etc
Instructions to bypass Phono Preamplifier onboard subsonic filtering to leave that for Devinyliser to handle
Suggestions for some hard to source parts or their alternatives
Website description: “The Signal Transfer Stereo Phono Preamplifier is a stand-alone version of the phono system used in the Precision Preamplifier. It offers both moving-magnet and moving-coil inputs, the latter with two gain options for optimal performance. It gives extremely accurate RIAA equalisation, a noise performance that approaches the theoretical limits, and superb linearity.”
No parts kits are currently available, according to recent correspondence with Mr Self.
Balanced output version: http://www.signaltransfer.freeuk.com/RIAAbal.htm
Unbalanced output version: http://www.signaltransfer.freeuk.com/RIAAunbal.htm
Devinyliser: http://www.signaltransfer.freeuk.com/devinyl.htm
Mr Self has taken over managing the website and fulfilling orders. He has been very responsive and the boards were received quickly.
I’m impressed with the build quality of the boards. Most of the parts are easily sourced using the BOM provided in printed documentation (or perhaps you will get a pdf) with the boards by searching for the values needed at your preferred supplier and verifying the part you choose has the correct lead spacing to match the board.
He does have a supply of the 2SB737 low noise transistors that he sells, tests each first and ships.
It took some digging and help from other diyaudio members to source a few of the parts.
Pending:
BOM with parts numbers from Digikey, Mouser, etc
Instructions to bypass Phono Preamplifier onboard subsonic filtering to leave that for Devinyliser to handle
Suggestions for some hard to source parts or their alternatives
Glenv6 over on the "Doug Self Preamp from Linear Audio #5" thread has suggested compatible push button switches and RCA jacks
"Mouser has the 4PD, search for 688-SPUN194700. I bought the RCA jacks at Newark. Search for 26M2040."
"Mouser has the 4PD, search for 688-SPUN194700. I bought the RCA jacks at Newark. Search for 26M2040."
I have successfully built mine and it works well. I have it AFTER a Darlington Labs MP-7.
Got all parts from Mouser (attached), except Power Supply (ebay) (+17 & -17 VDC), and enclosure (amazon).
I socketed the OP-AMP so I can roll my own in the future, or go full-discrete op-amps.
🙂 neil
Got all parts from Mouser (attached), except Power Supply (ebay) (+17 & -17 VDC), and enclosure (amazon).
I socketed the OP-AMP so I can roll my own in the future, or go full-discrete op-amps.
🙂 neil
Attachments
I am trying to order parts for these right now. What have you done about the impossible to find box caps. 20 of them. I guess a better question is did you stick to the BOM or no and maybe "what changes did you make?". I am into this hobby a bit over my head I guess. I have success if I can paint by numbers and have some direction. Figuring out substitutions is not exactly easy for me right now. Thanks in advance for any help you can offer.
Hi guys, I'm wondering if you could help me finish my Doug Self designed RIAA unbalanced pre-amp.
There are components in the schematics that Doug defines as AOT - adjust on test.
Now I have no idea how to do this or which components to pick.
Can you guys help?
Thanks
There are components in the schematics that Doug defines as AOT - adjust on test.
Now I have no idea how to do this or which components to pick.
Can you guys help?
Thanks