Ultra high spec opamp MC/MM phono, warp "elliptic" filter, line, headphone amps

[rljones]

Thanks for the reply.

I think I'll just stick with the OPA1641 to avoid any FR (or worse oscillation) issues.

 

[robnik33]

If anyone interested, I listed a completed v2.0 LOMC only with dual socketed LT1115 op amps per channel in the swap meet section. PM me if interested.

FS: WYN Palmer LOMC preamp v2.0 build

 

[k1965813]

I received the boards. They are very nice,thank you very much.
I found the designator of R73 and R75 are in wrong places but their values (47 and 56k) are correct.
Any way, its a very minor mistake.

 

[wynpalmer2]

Thank you. Yes, I found out that the designations R73 and R75 were exchanged about three days ago. Thanks for letting me know. My layout partner made a mistake- his first one I might add- and the correction will be in place on future board shipments.

 

[k1965813]

I just finish this excellent Phono preamp and enjoying music now.

 

[wynpalmer2]

As of this time I am ending any board sales due to imminent changes in US tax policy.

 

[timgrindell]

Thank you for all your work Wyn and for making the boards available.
They sound very very good.
t

 

[Gerald76]

I have 3 PCBs, v3.1, left from my current order. I would offer them at cost price (~11€ / ~12$) plus shipping (DHL internatioanl 12.89 € including insurance and tracking, Europe is cheaper) from Germany.

 

[Bluesman_55]

I have 3 PCBs, v3.1, left from my current order. I would offer them at cost price (~11€ / ~12$) plus shipping (DHL internatioanl 12.89 € including insurance and tracking, Europe is cheaper) from Germany.

@Gerald76
I'm interested buying 2 of your PCB's. Are they still available? I'm living in Northern Germany, so the shipping should be easy.

 

[Gerald76]

Hi Bluesman,

sorry all sold.

 

[Bluesman_55]

@Gerald76
o.k. thanks for the info.
Where did you buy the boards? Is there another source in the EU or can you only buy directly from Wyn?

 

[Gerald76]

@Bluesman_55
I downloaded the gerber files and ordered 5 PCBs at jlcpcb.com. The company is in China but they send worldwide.

 

[Bluesman_55]

@Bluesman_55
I downloaded the gerber files and ordered 5 PCBs at jlcpcb.com. The company is in China but they send worldwide.

That's a good tip, I'll do it that way.

 

[nzastro]

As of this time I am ending any board sales due to imminent changes in US tax policy.

Hi Wyn, I live in New Zealand and would like to build a LOMC phono stage.
Yours looks very interesting.
I too am retired, but due to health issues so have returned to my vinyl hobby.
Have an old Linn LP12 and a "The Wand" 10.3" Master tone arm.
Using a balanced prototype tube preamp, March P541 mono blocks and Harbeth HL5S speakers.

I've just purchased two preloved cartridges. The MC at 2.3mv and a LO Grado Sonata Statement MI at .1mv output @100k ohms.
Don't think my "Wand EQ or Pro-ject Tube Box DS will cope.

Would really appreciate your opinion and help if possible.

Thank you Wyn.

Regards, Tony.

 

[nzastro]

My email address is one@xtra.co.nz

 

[wynpalmer2]

My email address is one@xtra.co.nz

Alas, as I wrote, I no longer can source boards, and DiyAudio has cautioned me against promoting their sale., even tangentially.
However, you can download the files necessary to have the boards made from the dropbox links on,
https://audiokarma.org/forums/index...p-elliptic-filter-line-headphone-amps.937686/

 

[wynpalmer2]

https://www.dropbox.com/sh/3ax8p175lu2izoc/AADfl-SVvf84CR37Ra2lGMjla?dl=0
is the direct link to the documentation including Gerber files.

 

[force of 1/2]

I am thinking of getting a small run of PCBs made. I would offer them at cost (of course) plus shipping. Are there 4 other people in the U.S. interested? (International shipping would make it less cost effective for those outside the USA)

Regards,
John

 

[mkane77g]

Chinese or USA made?

 

[force of 1/2]

Well, that depends on how much we are willing to spend.
Do you have a good US source for PCBs? I have only used OSHPark.