Hi Ka,
What 0.01uF capacitor is that? Did you mean C2 which was 0.1uF and should be changed to 0.068uF? I do recommend changing this capacitor as it moves the LF pole up and provides more accurate LF EQ contour, if you have PEQ or DSP you can probably compensate to a significant extent. I remember it was an important change. It has been more than 3 years since I last did anything with the strain gauge pre, although I do still use it.
What 0.01uF capacitor is that? Did you mean C2 which was 0.1uF and should be changed to 0.068uF? I do recommend changing this capacitor as it moves the LF pole up and provides more accurate LF EQ contour, if you have PEQ or DSP you can probably compensate to a significant extent. I remember it was an important change. It has been more than 3 years since I last did anything with the strain gauge pre, although I do still use it.
Hello, all, newbie here.
Perhaps I can make a contribution to this thread.
I have the Panasonic 451C cartridge with stylus plus 2 NOS styli (see pics attached).
I also have the 'step up' device that came with it, a Precision Fidelity unit. Haven't ever seen another (again, see pics attached).
I thought that kevinkr might find this info interesting and useful.
Since there is a power adapter, is it possible that this could run on DC and improve sonics?
Thanks for letting me share. Thoughts, comments and feedback appreciated!
Bob
N Metro Atlanta, GA
Perhaps I can make a contribution to this thread.
I have the Panasonic 451C cartridge with stylus plus 2 NOS styli (see pics attached).
I also have the 'step up' device that came with it, a Precision Fidelity unit. Haven't ever seen another (again, see pics attached).
I thought that kevinkr might find this info interesting and useful.
Since there is a power adapter, is it possible that this could run on DC and improve sonics?
Thanks for letting me share. Thoughts, comments and feedback appreciated!
Bob
N Metro Atlanta, GA
Attachments
I have a stylus question. I scored a Panasonic branded EPC-450CII from another member here. It has an original stylus on it, apparently in not bad condition.
I am still a way off building the required pre-amp.
I just bought a backup NOS stylus from Yahoo JP. This is a Technics branded stylus; its a EPS-46STQD.
I understand that the EPC-450CII takes a EPS-45STQD stylus. The stylus thats currently fitted on this cartridge is actually labelled "EPS-450QD."
The EPS-46STQD stylus that I got looks almost identical to the one fitted on my EPC-450CII - will it work? Or will the EPS-46STQD ONLY fit the EPC-460C cartridge? (as it says on the stylus box "for EPC-460C")
thanks!
I am still a way off building the required pre-amp.
I just bought a backup NOS stylus from Yahoo JP. This is a Technics branded stylus; its a EPS-46STQD.
I understand that the EPC-450CII takes a EPS-45STQD stylus. The stylus thats currently fitted on this cartridge is actually labelled "EPS-450QD."
The EPS-46STQD stylus that I got looks almost identical to the one fitted on my EPC-450CII - will it work? Or will the EPS-46STQD ONLY fit the EPC-460C cartridge? (as it says on the stylus box "for EPC-460C")
thanks!
Attachments
This project dates all the way back to 2017 and it has been more than 4 years since I last worked on anything to do with this design. People have been contacting me for boards and other parts over the years and at this point I have no boards or parts for this design. Consequently I have decided to make the gerber and other files freely available for non-commercial use. (I would hope anyone planning to profit from my work would accord me the courtesy of talking to me first and working out an arrangement that is mutually satisfactory.)
Attached are the very last schematics and gerber files for this design. I have also included BOMs, the basic design dates back to 2017 with a minor board revision to support the newer 4 pin EQ which is version 1aR, the last EQ provided is REV.8.3 which works very well. The PSU is as designed, and there were no changes I am aware of.
Please note the reworks in the 1aR/V2.1 schematic and do them. Parts situation has changed drastically since I designed this and you may need to find alternates for a few of the components.
I find myself in a quandary due to the length of time that has passed and all of the different versions of the design that exist. Unfortunately many of the schematics and PCB layouts are in KiCad 6 and are not properly supported by newer versions, and I am unwilling to spend the time and effort to update them at this time.
Going forward I hope the crowd will continue to provide technical support to those interested in building this, and where possible I will try to assist.
Feedback from recent builders has been very positive, hence my decision to make the files available.
Attached are the very last schematics and gerber files for this design. I have also included BOMs, the basic design dates back to 2017 with a minor board revision to support the newer 4 pin EQ which is version 1aR, the last EQ provided is REV.8.3 which works very well. The PSU is as designed, and there were no changes I am aware of.
Please note the reworks in the 1aR/V2.1 schematic and do them. Parts situation has changed drastically since I designed this and you may need to find alternates for a few of the components.
I find myself in a quandary due to the length of time that has passed and all of the different versions of the design that exist. Unfortunately many of the schematics and PCB layouts are in KiCad 6 and are not properly supported by newer versions, and I am unwilling to spend the time and effort to update them at this time.
Going forward I hope the crowd will continue to provide technical support to those interested in building this, and where possible I will try to assist.
Feedback from recent builders has been very positive, hence my decision to make the files available.
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