Is there an updated list of the kits parts for this GB or are the BOM from the build guide still applicable as I see 2013 on it? I mainly am interested in the boards and the semiconductors that need test matching. Capacitors, resistors, terminals, plugs, etc. I like to pick myself within build guidelines. Which kits would you say are best for this. Thank you for help!
best regards,
Steve
best regards,
Steve
Here is the BOM for the boards for the kits I use with them.
https://docs.google.com/spreadsheets/d/1L_ro2avLFSxt6D0jxuo6os9bY0fuLfhX1kVpBSPFMbo/edit#gid=0
Here is a somewhat basic build guide for new board.
https://docs.google.com/document/d/1ip_eB3CbCMnZqCa7Nrlpsx4D9TfRMBJnN2GqJsKhqFE/edit
I think if you are interested in your own parts, this will be helpful for values and sizing requirements anyways.
https://docs.google.com/spreadsheets/d/1L_ro2avLFSxt6D0jxuo6os9bY0fuLfhX1kVpBSPFMbo/edit#gid=0
Here is a somewhat basic build guide for new board.
https://docs.google.com/document/d/1ip_eB3CbCMnZqCa7Nrlpsx4D9TfRMBJnN2GqJsKhqFE/edit
I think if you are interested in your own parts, this will be helpful for values and sizing requirements anyways.
Salas RIAA is, may be, the best JFet-phono-amp!
Do not throw away the feasible best sound by, for example, circuit board construction.
And: trimmers usually sound better than resistors.
Use better capacitors than you see here. But these FMDs also sound quite good: just a bit more grainy, coarser than the best others. Use as small as possible: mica or polyester. NO WIMA MKPs or other fat gimmicks.
Do not throw away the feasible best sound by, for example, circuit board construction.
And: trimmers usually sound better than resistors.
Use better capacitors than you see here. But these FMDs also sound quite good: just a bit more grainy, coarser than the best others. Use as small as possible: mica or polyester. NO WIMA MKPs or other fat gimmicks.
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Hi Steve,
The answer is in the build guide notes section (below). It depends on how much gain that you need (or the type of cartridge that you have).
Gain. With Q1 and Q2 populated expect 62-63dB. Its OK for 0.2mV-0.4mV MC cartridges.
For 0.5mV+ MC cartridge and enough amplification in your control preamp or when having a medium MC 0.8mV-1mV, don't populate Q2,R3, use 2.2K 2W R13 for 56-57dB. Q1 IDSS and R2 as in the mentioned table. By trimming R8 when with FFT test gear you may match the channels better.
For high MC cartridge 2-2.5mV don't populate Q2,R3, use 68R R2 and 5.6K 1W R13 for 43dB gain. Choose Q1 between channels from a 10.5-12.5mA range at 5% IDSS pair tolerance.
For circa 5mV MM cartridge don't populate Q2,R3, use 91R R2, 5.6K 1W R13, 1.8K R4, for 40dB gain and proper overload margin. Use 100nF C3 only value when with MM.
Choose Q1 between channels from a 10.5-12.5mA range at 5% IDSS pair tolerance.
Cheers,
-fred-
The answer is in the build guide notes section (below). It depends on how much gain that you need (or the type of cartridge that you have).
Gain. With Q1 and Q2 populated expect 62-63dB. Its OK for 0.2mV-0.4mV MC cartridges.
For 0.5mV+ MC cartridge and enough amplification in your control preamp or when having a medium MC 0.8mV-1mV, don't populate Q2,R3, use 2.2K 2W R13 for 56-57dB. Q1 IDSS and R2 as in the mentioned table. By trimming R8 when with FFT test gear you may match the channels better.
For high MC cartridge 2-2.5mV don't populate Q2,R3, use 68R R2 and 5.6K 1W R13 for 43dB gain. Choose Q1 between channels from a 10.5-12.5mA range at 5% IDSS pair tolerance.
For circa 5mV MM cartridge don't populate Q2,R3, use 91R R2, 5.6K 1W R13, 1.8K R4, for 40dB gain and proper overload margin. Use 100nF C3 only value when with MM.
Choose Q1 between channels from a 10.5-12.5mA range at 5% IDSS pair tolerance.
Cheers,
-fred-
The UFSP version has switches to move from pair to quad mode, and to add in multiple resistors depending on gain R13-R16 bank, leaving one on at a time. It is not really on the fly stuff, the device will have to be set again to get the VR for it.
This is discussed at the tail end of the build guide in a screenshot from Salas.
https://docs.google.com/document/d/1ip_eB3CbCMnZqCa7Nrlpsx4D9TfRMBJnN2GqJsKhqFE/edit
This is discussed at the tail end of the build guide in a screenshot from Salas.
https://docs.google.com/document/d/1ip_eB3CbCMnZqCa7Nrlpsx4D9TfRMBJnN2GqJsKhqFE/edit
So today I am using a Sumiko Pearl MM but that is not permanent as I still have to "get to" my ideal turntable which I don't know what that will be. I will probably have to start with a MM cartridge and save for a really good MC in time even then, so it sounds like I can have the ability to "grow" into a higher quality setup from where I am today, sounds perfect for me. I am building a new PassDiy B1 preamp now and also will soon have Korg B1 ready also have a Salas DCB I have waiting in the wings to build. These all pair with SET tube amps so I just have to find my preamp gains to setup phono boards if I am understanding correctly. Thanks for the information. I just need one each of quad 2sk239 and also 2sk170 kits on the GB spreadsheet? Thanks for the help everyone.
best regards,
Steve
best regards,
Steve
If your not sure what cart will be paired with it, or want to change, the quad gives you the most options.
With that said, you can get 56-57db with just a pair.
With a quad , you can just use the DIP switches to turn off a pair.
