First Watt M2 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 14th March 2012, 05:33 AM   #1
diyAudio Member
 
chrismercurio's Avatar
 
Join Date: Aug 2006
Location: Silicon Valley
Default First Watt M2

All,

I know we generally talk about building stuff around here and I'm on the fence about building a 3 stage DHT GM70 amplifier. The M2 would just make life easier. I'm looking for something with the immediacy of SET but the detail, extension and reliability of solid state with enough power to drive a real world speaker. I have "normal" speakers of moderate efficiency and a 4 ohm nominal impedance. Any feedback is very much appreciated.

Hoping to hear from those that own or have heard the M2...

Best,
  Reply With Quote
Old 14th March 2012, 03:56 PM   #2
ra7 is offline ra7  United States
diyAudio Member
 
Join Date: Feb 2009
Blog Entries: 1
Ohh! And I thought you'd never ask.

The M2 is an amazing amplifier. I would refer you to Srajan's reviews on 6moons for comparisons with the F5 and J2.

First, what it does like good triode amps: smooth Class A sound. Very palpable and real images. Deep soundstage.

And what it does better than tubes: Bass, depth, control. Zero coloration. Once you hear this, you will know that even a good 2A3 adds some coloration, however pleasent it may be. This amp can drill down to the last detail and yet sound accurate, pure and sweet. In fact, I would put detail retrieval better than a 2A3. Little inflexions of voice, small nuances are revealed easily and with a touch of sweetness.

IMO, the M2 is a very niche product, intended for people who crave the sweetness of tubes above all else. If you want just the facts, go with an F5. But you like a little romance, some musical pleasure, the M2 fits the bill. I can't believe how much pleasure this amp is giving me, which I previously thought was possible only with a good SET.

Thanks Papa!
  Reply With Quote
Old 16th March 2012, 06:57 PM   #3
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Thanks for the good review......


  Reply With Quote
Old 16th March 2012, 07:07 PM   #4
6L6 is offline 6L6  United States
diyAudio Member
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
Is the real schematic floating around there somewhere? It's an awfully intriguing design...
  Reply With Quote
Old 16th March 2012, 07:10 PM   #5
diyAudio Member
 
chrismercurio's Avatar
 
Join Date: Aug 2006
Location: Silicon Valley
I think this one is strictly under wraps. He has to keep some of the good stuff for himself. Especially considering how much he shares and how freely he shares it. I need to have one...

Last edited by chrismercurio; 16th March 2012 at 07:22 PM.
  Reply With Quote
Old 16th March 2012, 07:21 PM   #6
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
I made one iteration , somewhere right after first informations about concept and pics were published on net;

even if it's working (was , dismantled , as usual ) it is pathetic comparing to real McKay .

sound was gorgeous .

unfortunately - can't share , there are still (in it ) some tricks from Papa's sleeve not published , so I can't be first to reveal them



I succeeded in most prominent characteristic of M2 - 90 or something secs slow ramp up of bias



in any case - I certainly gave few mins of good laugh to Papa , when I send him schm of my iteration

__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 16th March 2012, 07:45 PM   #7
ra7 is offline ra7  United States
diyAudio Member
 
Join Date: Feb 2009
Blog Entries: 1
Yes, it does take time to warm up. I could swear it sounded better after an hour.

It is also driving a notoriously difficult load right now - B&W683s. Tube amps sound awful driving these speakers. The M2 sings. I measured about 5V on Pano's voltage at the speaker terminal. Just enough volume for me through the DCB1. It takes a good 3.5V to drive it to full power though.

Its dead quiet too. So quiet that you cannot tell if it is on through the speakers. Can't wait to see how it sounds on the big horns.
  Reply With Quote
Old 16th March 2012, 07:57 PM   #8
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
did you post somewhere some porn of your system ?

regarding time - 1 hour is sort of usual period for A class amps ( at least sand ones )

I was thinking more about things Papa sez to 6moon Srajan :

Quote:
The bias circuits take a couple of minutes to fully charge but then they settle into high precision. The slow charge is how I avoid that precision from creating any sonic artifacts. The first ones I made took a full 2 minutes before any sound came out at all. You can imagine the messages I got. I should have put something in the manual about it. Something like that's the tubes warming up! Also, as the M2 biases up, the output stage goes from class B to class AB to class A. What you get to listen to is the character of each without feedback. Ontogeny recapitulates philogeny.
that was answer for Srajan's :

Quote:
A quick check of life upon arrival netted high audible distortion for the M2. That's because I already had signal running when I flicked the power switch.
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 16th March 2012, 08:55 PM   #9
ra7 is offline ra7  United States
diyAudio Member
 
Join Date: Feb 2009
Blog Entries: 1
No, no porn yet. Maybe once the paper horns are ready.
  Reply With Quote
Old 16th March 2012, 08:58 PM   #10
diyAudio Member
 
Join Date: May 2001
Blog Entries: 5
I see ra7 has been holding out on us.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
First Watt M2 Kovax Pass Labs 154 13th February 2014 05:20 PM
swans m2 blue934 Multi-Way 0 22nd May 2008 05:56 AM
Kenwood basic m2 Johnny25 Class D 0 20th January 2006 06:48 PM
Tannoy M2 Crossover BlackWidowAudio Multi-Way 0 1st February 2002 10:39 AM


New To Site? Need Help?

All times are GMT. The time now is 04:35 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2