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The diyAudio First Watt M2x
The diyAudio First Watt M2x
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Old 26th April 2018, 10:30 PM   #21
6L6 is offline 6L6  United States
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The diyAudio First Watt M2x
Quote:
Originally Posted by Murdoc View Post
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 -

Click the image to open in full size.

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.

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Old 26th April 2018, 10:39 PM   #22
pchw is offline pchw  United States
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I bet some one is going to start screwing rolling to hear which one sounds cooler/warmer
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Old 26th April 2018, 10:41 PM   #23
jackinnj is offline jackinnj  United States
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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).
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Old 26th April 2018, 10:50 PM   #24
6L6 is offline 6L6  United States
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Quote:
Originally Posted by pchw View Post
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.

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Old 26th April 2018, 10:52 PM   #25
massimo is offline massimo  Italy
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Quote:
Originally Posted by pchw View Post
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!
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Old 26th April 2018, 10:55 PM   #26
6L6 is offline 6L6  United States
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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

Last edited by 6L6; 26th April 2018 at 11:02 PM.
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Old 26th April 2018, 11:01 PM   #27
Mark Johnson is offline Mark Johnson  United States
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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.

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Old 27th April 2018, 12:13 AM   #28
JSA1971 is offline JSA1971  Canada
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Looks great gentlemen! Thanks for the hard work! Just might be my next amp build project 🤔
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Old 27th April 2018, 01:47 AM   #29
res07njc is offline res07njc  United States
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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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Old 27th April 2018, 02:11 AM   #30
mpmarino is offline mpmarino  United States
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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?
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