The diyAudio First Watt M2x - Page 3

6L6 · 26th April 2018, 10:30 PM

Quote:

Originally Posted by Murdoc

why did you chose to use screws but not the usual board connectors

A long time ago, a young designer (*) made a preamp with modules that sat above the main PCB and secured with bolts that also made the electrical connections as shown here -

We figured that M3 hardware is common enough to find, sturdy, and if it was good enough for that guy working at Threshold way back when, it's a time-tested solution.

* Initials N.P.

pchw · 26th April 2018, 10:39 PM

I bet some one is going to start screwing rolling to hear which one sounds cooler/warmer

jackinnj · 26th April 2018, 10:41 PM

i have used the Panasonic resistors in my Pass clone amps but will try the 0.47 Ohm resistors, but the Xicon metal oxide resistors have somewhat lower ESL (for those worrying about performance above 1MHz).

6L6 · 26th April 2018, 10:50 PM

Quote:

Originally Posted by pchw

I bet some one is going to start screwing rolling to hear which one sounds cooler/warmer

If one tries this hardware it will sound significantly different... the sound of silence.

massimo · 26th April 2018, 10:52 PM

Quote:

Originally Posted by pchw

I bet some one is going to start screwing rolling to hear which one sounds cooler/warmer

Pure copper hardware sounds better, but rodhium plated screws are the best!

6L6 · 11:02 PM

Somebody was hearing rumors of fantastic sound from Soviet-era solid gold hardware. It was only made in M2.5, but it will still fit if carefully aligned.

Sonic Bliss! Better soundstage, bass slam, and that "you are there" feeling.

/sarcasm

Mark Johnson · 26th April 2018, 11:01 PM

If there were a large number of signals communicating back and forth between the daughter board and the mother board, then a connector might have been more advantageous. But the M2x daughterboard has only four I/O terminals -- one fewer than the Threshold NS10 daughter board below. I happen to really like the solidity / ruggedness of bolts + star washers + threadlocker fluid / Loctite (or nail polish), especially when transporting the amplifier. So that's what I lobbied for and that's what we ended up using. Yep, it's a little different. Maybe that's a feature instead of a bug.

_

JSA1971 · 27th April 2018, 12:13 AM

Looks great gentlemen! Thanks for the hard work! Just might be my next amp build project 🤔

res07njc · 27th April 2018, 01:47 AM

Kudos to Mark Johnson and 6L6, for bringing a compelling (and beloved) design to the changing demands of techno reality. Soup to nuts... awesome.

mpmarino · 27th April 2018, 02:11 AM

Don't the bolts prevent 'live swapping' preventing true A/B testing??

Great idea - nice job. How hard would it be for someone to home etch a couple daughter cards if they want to try yet something else?

26th April 2018, 10:39 PM	#22
pchw diyAudio Member Join Date: Apr 2006 Location: Fremont, California	I bet some one is going to start screwing rolling to hear which one sounds cooler/warmer __________________ - Fred -

26th April 2018, 10:55 PM	#26
6L6 diyAudio Moderator Join Date: Oct 2010 Location: Denver, Colorado	Somebody was hearing rumors of fantastic sound from Soviet-era solid gold hardware. It was only made in M2.5, but it will still fit if carefully aligned. Sonic Bliss! Better soundstage, bass slam, and that "you are there" feeling. /sarcasm __________________ Illustrated Build Guides - Pass F4 - Pass B1 - Pass F5 - Pearl 2 - O2 HPA - Hagerman Bugle 2 - Pass Aleph J - Me at BA '13 -Pass F5Turbo - BA-3 Amp - BA-3 Preamp - F6 AmpCampAmp Me at BAF '18https://www.youtube.com/watch?v=pl0GniCEoVkMe at BAF19https://www.youtube.com/watch?v=28PpmM-x__4 Last edited by 6L6; 26th April 2018 at 11:02 PM.

27th April 2018, 02:11 AM	#30
mpmarino diyAudio Member Join Date: Jun 2004 Location: Northeast USA.	Don't the bolts prevent 'live swapping' preventing true A/B testing?? Great idea - nice job. How hard would it be for someone to home etch a couple daughter cards if they want to try yet something else? __________________ Crazy Yankee.

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26th April 2018, 10:41 PM	#23
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	i have used the Panasonic resistors in my Pass clone amps but will try the 0.47 Ohm resistors, but the Xicon metal oxide resistors have somewhat lower ESL (for those worrying about performance above 1MHz).

27th April 2018, 12:13 AM	#28
JSA1971 diyAudio Member Join Date: Jan 2016 Location: North Toronto	Looks great gentlemen! Thanks for the hard work! Just might be my next amp build project 🤔

27th April 2018, 01:47 AM	#29
res07njc diyAudio Member Join Date: May 2005 Location: Tampa Fla	Kudos to Mark Johnson and 6L6, for bringing a compelling (and beloved) design to the changing demands of techno reality. Soup to nuts... awesome.

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