Hello
I'm an ordinary user who likes listening to music who lives in Republic of Korea.
I learned about this project by chance.
I thought I'd like to try making this new amp, but this is my first time doing DIY.
https://modushop.biz/site/index.php?route=product/product&product_id=971
It looks like they only sell amplifier cases here.
I'm wondering where I can buy this PCB and components.
Please forgive me if I've missed something or done anything wrong.
I'm an ordinary user who likes listening to music who lives in Republic of Korea.
I learned about this project by chance.
I thought I'd like to try making this new amp, but this is my first time doing DIY.
https://modushop.biz/site/index.php?route=product/product&product_id=971
It looks like they only sell amplifier cases here.
I'm wondering where I can buy this PCB and components.
Please forgive me if I've missed something or done anything wrong.
Good day everyone.
Thank you Wayne for this project made available and all involved to deliver this project to DIY community.
I have assembled and housed in to two separate enclosure.
Need some time to enjoy music.
Pictures attached.
Best regards.
Sasha.
Thank you Wayne for this project made available and all involved to deliver this project to DIY community.
I have assembled and housed in to two separate enclosure.
Need some time to enjoy music.
Pictures attached.
Best regards.
Sasha.
Attachments
WOW!!!
This may be the current champion in the "Nicest built Pearl 3" contest!
Absolutely beautiful.
👏 👏 👏
This may be the current champion in the "Nicest built Pearl 3" contest!
Absolutely beautiful.
👏 👏 👏
It's up and running. Will be replacing the overly bright green LED's that came in the kit with some blue ones with a higher dropping resistor to match the power supply. Had some hum problems that turned out to be external with a failed phono cable.
This is in place of an Audio Research PH5 and it held its own. Benz Micro Glider SM HOMC. Same high detail, a bit more bass. After having to change R27 to get the bias correct, I did not want to change the 2K2 R9 resistor to get 60 dB to match the same as PH5, so made a 1500 ohm jumpers to put in place of the shorting jumpers to get close to the same gain for comparison. Only other change is using LME49720 op amps left over from Mx2.
Excellent design. Kudos to Wayne.
This is in place of an Audio Research PH5 and it held its own. Benz Micro Glider SM HOMC. Same high detail, a bit more bass. After having to change R27 to get the bias correct, I did not want to change the 2K2 R9 resistor to get 60 dB to match the same as PH5, so made a 1500 ohm jumpers to put in place of the shorting jumpers to get close to the same gain for comparison. Only other change is using LME49720 op amps left over from Mx2.
Excellent design. Kudos to Wayne.
Attachments
Thank you 6L6 for your response, Everything turned out perfectly,
I did followed you tutorials for assembly on a few projects.
Best regards.
Sasha.
4.th build underway.
Still trying to maximize performance by trying different things.
This time with 4 x 2SK2145 instead of 2SK209, some different capacitors, but what I´m hoping
will have the biggest impact: Every single component is meticously matched between Left & Right channel on top
of being matched closest possible to the correct value on schematic.
So far:
Still trying to maximize performance by trying different things.
This time with 4 x 2SK2145 instead of 2SK209, some different capacitors, but what I´m hoping
will have the biggest impact: Every single component is meticously matched between Left & Right channel on top
of being matched closest possible to the correct value on schematic.
So far:
Hello Boydk,
with all those efforts you put in your 4th build (post #5090), I am sure you will get the last little bit more out of this beautiful phonostage. Let us know, if you can hear those last small differences. Is it the 'icing on the cake'? I think so. Small differences, but...
Have fun and enjoy the sound!
Cheers
Dirk
with all those efforts you put in your 4th build (post #5090), I am sure you will get the last little bit more out of this beautiful phonostage. Let us know, if you can hear those last small differences. Is it the 'icing on the cake'? I think so. Small differences, but...
Have fun and enjoy the sound!
Cheers
Dirk
Hi,
I try to build my P3- version an will use 5532 OpAms.
Do I have to put Q9 (J112) to the positive rail?
In Douglas self's book "The design of active crossovers" on page 390 I can read: .... For the 5532, the current must be injected from the positive rail ....
Thanks for help
I try to build my P3- version an will use 5532 OpAms.
Do I have to put Q9 (J112) to the positive rail?
In Douglas self's book "The design of active crossovers" on page 390 I can read: .... For the 5532, the current must be injected from the positive rail ....
Thanks for help
@Boydk : I'm interested in your findings with regard to the 2SK2145. Do you notice lower noise due to double the amount of jfets? Did you use Y-grade devices with low Idss?)? Any changes in resistors around Q5 to keep the voltages correct? (R4 to R7 are still 10R I see). Ralph Stens does something similar with 2SK2145's in his XONO 2019 and mentions changing resistor values.
@Wellerman
I still need some components to finish this build. Will respond to the Q´s as soon as this is done, and I have listened
for some days.
Around Q5 I´ve kept the original values (for now). Same with R4 to R7. When up and running, I´ll measure the voltage drop
over the resistors and probably consider alt. values for R4 to R7. Around Q5 I´ll need to measure first.
And regarding the IDSS...... Not "Y". Went for "GR"´s.
Am a bit busy at the moment with other stuff, so this will come along mid/late february.
I still need some components to finish this build. Will respond to the Q´s as soon as this is done, and I have listened
for some days.
Around Q5 I´ve kept the original values (for now). Same with R4 to R7. When up and running, I´ll measure the voltage drop
over the resistors and probably consider alt. values for R4 to R7. Around Q5 I´ll need to measure first.
And regarding the IDSS...... Not "Y". Went for "GR"´s.
Am a bit busy at the moment with other stuff, so this will come along mid/late february.
There is a P3 sitting here on my bench. Where the JFETS normally solder to the board I installed pin sockets.
I have rolled in and out 2SK170's and the stock 209's.
I have a bag full of 2N5457's to pick parts from.
What difference in performance do you all expect?
Thanks DT
I have rolled in and out 2SK170's and the stock 209's.
I have a bag full of 2N5457's to pick parts from.
What difference in performance do you all expect?
Thanks DT
Sell the 2N5457's -- not in the same noise league as the 209's, K170s. 2N5457 are, however, quite adequate for Dr. Marsh's headphone amplifier. (Note, 2N5457's from one US dealer are fake.)
Now, if someone wanted to play around with Interfet IF3601 that would be interesting.
Now, if someone wanted to play around with Interfet IF3601 that would be interesting.