Official M2 schematic

[Despearce]

it will become my mantra, along with "solder once, check thrice"

 

[Zen Mod]

there is another one :

I only cut trice , and it's always short !

 

[schubert]

I've had those heat sinks for 25 years

Ah! Something old...I'm sure Zen Mod would approve.

 

[Zen Mod]

I've had those heat sinks for 25 years

Ah! Something old...I'm sure Zen Mod would approve.

flocchini ....... my type of liar

 

[alazira]

Here is my first attempt om a balanced M2-DCB1 combo, thanks to previous modeling posts and encouragement.

I found the Edcor settings on a .rs website with these parameters
Edcor PC600/15K (1:5)
pr. : 44Rdc, 240mH (600R)
sec. : 235Rdc, 5.7H (15k)
My trafos are already mounted so I can't measure them to verify, I hope they are correct, they model 1:5 voltage amplification fine.

I am still puzzled by the signal grounds in LTspice vs. no ground ref on a real balanced signal, and the volume control...
I made a complete working M2 SE model first, and than I simplified the M2 schematic and mirrored it with F5X signal input resistors. Next step would be a complete balanced model.

Any advice is welcome...

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

Have you made any progress? I would be interested in an "M2-X."
Perhaps like this?

 

[asanden]

No real progress, I must do some reading on symmetrical/differential/balanced signals, grounding to get a better understanding (I'm reading the BP "The G-word" document). The main issues I see are the volume control (as least good as my SE LDR) and/or input resistors, and the things I don't see...

I'am balancing my DAC first, the M2-X (or F6-X) amp will take a couple of months. I use the Aleph-J in the mean time.

The LTspice model from post #1190 works..., TeaBag has a new group buy open for the M2.

I also hope to get some advice.

Have you made any progress? I would be interested in an "M2-X."
Perhaps like this?

 

[Russellc]

TeaBag has a new group buy open for the M2.

Thanks for the headsup, just ordered ( Well, signed up on the list anyway ) my third set from Teabag.

Russellc

 

[aradan]

flocchini, what kind of binding posts are those?
The wood looks very nice.

These are called gaofei and some other names on ali express.

Look similar to furutech in a way and nicely built

Something
similar

Sent from my ONE A2003 using Tapatalk

 

[vdi_nenna]

Is there a start up procedure? Searched on "startup" and didn't return anything.

Thanks

Vince

 

[Zen Mod]

test PSU with bulb tester or variac,then triple check everything without power , then just bang it , set output offset and that's it

 

[Full Range]

A progress photo
Just waiting on one last component from Germany
Fingers crossed we will have a working amp in 2 weeks

 

[2 picoDumbs]

Looks good

 

[PJN]

I finally finished my M2 using Mr. Grimberg's very nice boards. I used 47K for R6, DC offset very low near 0 mV. I'm burning it in now in my garage, I'll compare it to my F6 later after it has some time on it. First impressions are dead quite, and it does have a different presentation than the F6. With the F6 my first impression was of the tremendous grip it has in the bass region, with the M2 after all of 5 minutes I don't get the same feeling, but the vocals seem very live/real. I used the 400 mm version of the 4U chassis from the DIY audio store.

Paul

 

[grimberg]

Congratulations!

Congratulations, nicely done.

 

[vdi_nenna]

Nice work! Let us know how they compare later.

 

[Zen Mod]

toss that nasty coax on input and use just twisted pair of tiniest solid core wire you have

 

[WalterW]

What are that coils? that you have on the perf board? forgot: looking very good!

 

[Russellc]

I finally finished my M2 using Mr. Grimberg's very nice boards. I used 47K for R6, DC offset very low near 0 mV. I'm burning it in now in my garage, I'll compare it to my F6 later after it has some time on it. First impressions are dead quite, and it does have a different presentation than the F6. With the F6 my first impression was of the tremendous grip it has in the bass region, with the M2 after all of 5 minutes I don't get the same feeling, but the vocals seem very live/real. I used the 400 mm version of the 4U chassis from the DIY audio store.

Paul

MyM2 was odd sounding at first, give it a while and it should transform into your favorite First Watt!

Russellc

 

[42001]

toss that nasty coax on input and use just twisted pair of tiniest solid core wire you have

Zen Mod,

I allways use starquad in my amps and shield them straight to PE. I'm interested in the minimal twisted pair you suggest. Why is that?


Kind regards,
Sjoerd

 

[PJN]

Zen Mod,

I allways use starquad in my amps and shield them straight to PE. I'm interested in the minimal twisted pair you suggest. Why is that?


Kind regards,
Sjoerd

That's star quad, not coax on the inputs, the coils on the board are part of a power filter

Paul