Author Topic: £25,000 Audiophile Pre-Amp repair video by Mend It Mark  (Read 18256 times)

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Online magic

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Re: £25,000 Audiophile Pre-Amp repair video by Mend It Mark
« Reply #175 on: December 20, 2024, 10:05:02 pm »
I don't think you need to demonstrate it, its a number on a screen.
But it would still be entertaining to see yes, In reality its something like 3% distortion before you can actually notice it: https://www.axiomaudio.com/blog/distortion so 1/10th of that would be good enough.

IMO a more "scientific" forum than ASR is Hydrogen Audio, where masochi people actually sit for hours listening to various things and produce rankings of codecs by perceived quality and things like that.

Playing with an audio analyzer is something anyone can do, particularly if one doesn't even care about high quality results. One thing that bothered me last time I looked at ASR (admittedly, a few years ago) was that no tests were done at various volume knob positions, which is known to affect noise (Johnson) and also distortion of bipolar input amplifiers. It wouldn't be hard to design an amp which works perfectly at 100% volume and unity gain at 2V RMS (or any other input level) but totally falls apart at -6dB volume - just use a 1MΩ volume pot and a high bias bipolar input stage, done.
 
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Offline timeandfrequency

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Re: £25,000 Audiophile Pre-Amp repair video by Mend It Mark
« Reply #176 on: December 21, 2024, 11:56:39 am »
To summarize  (updated on 20241228)
Previous release of this post is reply #71 that was updated on 20241216.

Mend It Mark  [first video]
The £25,000 Pre Amp that went Wrong Tom Evans Mastergroove SR mkIII   (43:52)
[URL placeholder, video was taken down due to 'copyright' claim]

Mend It Mark  [second video]
The £25,000 Pre-Amp Repair and the Copyright Strike (4:17  291 k views)
https://www.youtube.com/watch?  v=yPIrCaeVtvI   (edit URL to remove space characters)

Article from Hackaday Author : Maya Posch

Louis Rossmann
Tom Evans audio proves that their $30,000 audio preamp is garbage by filing a bogus copyright claim
https://www.youtube.com/watch?  v=gJYIhLQJtTs   (edit URL to remove space characters)  (18:47  384 k view)
https://odysee.com/@rossmanngroup:a/tom-evans-audio-proves-that-their-30,000:1

Louis Rossmann
Tom Evans Audio doubles down on a bad decision
https://www.youtube.com/watch?  v=qYpPNCzQCVQ   (edit URL to remove space characters)  (6:64  257 k view)
https://odysee.com/@rossmanngroup:a/tom-evans-audio-doubles-down-on-a-bad:3

Louis Rossmann
Mastergroove repair by Mend it Mark & an honest message to Tom Evans audio  (upload of Mark's first video + 5 min 20 sec foreword from Louis)
https://www.youtube.com/watch?  v=6hVe_spuJQI   (edit URL to remove space characters)  (49:18 39 k  189 k views)
https://odysee.com/@rossmanngroup:a/mastergroove-repair-by-mend-it-mark-an:1

iFixit
Mastergroove Repair by Mend It Mark Because Repair Information Should Be Free  (45:10  25 k view)
https://www.youtube.com/watch?  v=KOuetLQgM4w   (edit URL to remove space characters)


Many other YT channels uploaded Mark's first video (mainly low res)
Greetings to NickT6630 who also searches and lists all this stuff (see the comments below his copy of Marks's video.

- On Odysee  Account name : 'Anonyme'
https://odysee.com/The-%C2%A325,000-Pre-Amp-that-went-Wrong---Tom-Evans-Mastergroove-SR-mkIII   (8.4 k views)

- NickT6630  (41 k views) [20241215 : 61 k views !] (20241216 : 78 k views !) (103 k views)
https://www.youtube.com/watch?  v=uJ35ufUh2Tw   (edit URL to remove space characters)

- 'Brettbob Brettbob'
- '84johnhead'
- 'M0UAW(20241216 : 5.7 k views) (14 k views)
- 'GTI1dasOriginal' (2.5 k views)
- 'Trevor's Bench(6,8 k views) [20241216 : 10 k views]  (22 k views)
- 'matt moran' (update 20241215 : video has been removed from this channel)
- 'Stephen McGregor' (1,7 k views)
- 'Mr.HatnBootz' (3k views)
- 'MVVblogTV' (1,7 k views)
- 'Norbert2'   (3 incomplete uploads)
- 'Mateusz Petryszyn'
- 'Twobob Club(13 k views) [20241216 : 16 k views] (20 k views)
- 'David McGinn'  (2.3 k views)
- 'Marten Electric'  (2.7 k views)
- 'Turntable Guy'  (4.4 k views)
- 'Sort it out man'
- 'Matt'
- 'alch3myau'
- 'aitor co'
- 'Rhine-Labs'
- 'Als_25_Phototographer'
- 'Gotan's Basement'
- 'Ckunak' (upload of Louis' video)
- 'Pete'
- 'Cristian Negrea'
- 'Lagittaja'
- 'Jakob Varming' (5.7 k views)
- 'Haxorflakes'
- 'Ralfy Customs' (1.2 k views)
- 'S P'
- 'BaconButtie' (upload of Louis' video)
- 'Dogextreme'
- 'Julian'
- 'michael daniel'
- 'RepairIT'
- 'levendlicht'
- 'marcel'
- 'granddad19921' (upload on the 'Internet Archive')
- 'zzwijnands'
- 'nanocamp audio'
- 'Rumi'
- 'CookieClassiC Keks'
- 'Lagittaja'
- 'ShR33k'
- 'Als_25_Phototographer'
- 'alch3myau'


Hint : to locate Mark's first video on the channels above, use the YT search feature on the channel page and type 'Mend It Mark' or 'Tom Evans'



Other stuff about the same topic

- 'Martin Piper' reaction  (8:27  56 k view)
https://www.youtube.com/watch?  v=vFcHGAs2QLQ   (edit URL to remove space characters)

- Funny rant from 'Audio Masterclass'  (8:53  45 k views)
https://www.youtube.com/watch?  v=93QlQN_1yUA   (edit URL to remove space characters)

- New video from 'Audio Masterclass'  (4:40  28 k views)
https://www.youtube.com/watch?  v=XWIdMjG-TCU   (edit URL to remove space characters)

- 3rd video from 'Audio Masterclass'   (13:13  39 k views)
https://www.youtube.com/watch?   v=_VIXbYmf1Lo  (edit URL to remove space characters)

- Scott's (Defpom's Electronics Repair) reaction  (8:50  29 k views)
https://www.youtube.com/watch?  v=15AiQv-EiGM   (edit URL to remove space characters)

- Scientific Audiophile (excerpt about the video takedown)
The Shock of 2024 - Audiophile Edition

- 'fellpower' reaction (25:22 native language : german ; english subtitle translation available)
https://www.youtube.com/watch?  v=3XJPEKze5rg   (edit URL to remove space characters)

- Audio Science Review (ASR) Forum  Repairing The Questionable £25,000 Tom Evans Audiophile Pre-Amp

- 'VE99 Online' reaction  (native language : german ; english subtitle translation available) (link provided by @madires, thanks to him)
https://www.youtube.com/watch?  v=Nl8ooDSFHv8&t=220s   (edit URL to remove space characters)

- Case analysis made by copyright attorney Leonard French (video was found by @SolderSucker, thanks to him)
https://www.youtube.com/watch?  v=8WMi4cBMbIs   (edit URL to remove space characters)

- 'Code Therapy w/ René Rebe' reaction (16:45  7.6 k views)
https://www.youtube.com/live/  sHc9_E0w9P0     (edit URL to remove space characters)

Date format used in this post is YYYYMMDD  (ISO 8601)

*** Post history  ***
Update #1   20241221 : added 'Audio Science Review (ASR) Forum' and video upload on the 'Internet Archive'
Update #2   20241228  : added 'VE99 Online' reaction, case analysis made by copyright attorney Leonard French 3rd video from 'Audio Masterclass' and 'Code Therapy w/ René Rebe' ; added  'zzwijnands','nanocamp audio', 'Rumi', 'CookieClassiC Keks', 'Lagittaja', 'ShR33k', 'Als_25_Phototographer' and 'alch3myau' links



« Last Edit: December 28, 2024, 02:59:44 pm by timeandfrequency »
 
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Offline Stringwinder

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Re: £25,000 Audiophile Pre-Amp repair video by Mend It Mark
« Reply #177 on: December 21, 2024, 01:45:30 pm »
It seems like Tom Evans is very sensitive to interference from the "outside".
Takedown notices have had the opposite effect.

His brainchild also suffers from another sensitivity to interference but of the EMI-kind.
I can't imagine any takedown notices will fix that. Maxwells Laws are still valid everywhere.

- "Stop using RF emitters here or I will take legal action!"

The design (EMI-wise) is the worst I have seen in many years.
 
I don't suffer from Audiophoolia Nervosa so I will leave it at that.
My hobby is to make lots of noise (on old acoustic instruments), no electronics
at all and only a few grams of metal involved.

God Jul!
 

Online coppice

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Re: £25,000 Audiophile Pre-Amp repair video by Mend It Mark
« Reply #178 on: December 21, 2024, 03:14:22 pm »
It seems like Tom Evans is very sensitive to interference from the "outside".
Takedown notices have had the opposite effect.
"No publicity is bad publicity" - B Streisand.
 
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Online pope

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Re: £25,000 Audiophile Pre-Amp repair video by Mend It Mark
« Reply #179 on: December 21, 2024, 06:29:15 pm »
It seems like Tom Evans is very sensitive to interference from the "outside".
Takedown notices have had the opposite effect.
"No publicity is bad publicity" - B Streisand.

Within reason I would assume.
 

Offline Coordonnée_chromatique

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Re: £25,000 Audiophile Pre-Amp repair video by Mend It Mark
« Reply #180 on: December 23, 2024, 07:58:21 pm »
a 24 bit ladder DAC is built from a bunch of chips its very difficult to stabilise their temperatures well enough that the various chips track each other sufficiently well, even if you ovenize them. At one point the big silicon vendors tried making 24 bit ladder ICs, but matching problems killed them off.

The selled performances are technically unattainable,... don't you think that 10K€ is enough for a functional product ?
 

Offline r6502

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Re: £25,000 Audiophile Pre-Amp repair video by Mend It Mark
« Reply #181 on: December 25, 2024, 10:10:03 am »
Hello all,

interesting what goes on here.

I found also photos, where the housing is made from transparent acrylic plates, may be you saw it, but I did no saw a link here, may be it is interesting:
https://community.naimaudio.com/t/tom-evans-mastergroove/34491/5

Interesting, that they sell an expensive equipment like this preamp with a transparent housing. My first projects looked similar from the inside - very handcrafted. If you are paying that much money for your stuff, you will hear the difference   8) ...

From my side nothing more to say ;)

Guido 
Science can amuse and fascinate us all, but it is engineering that changes the world - - Isaac Asimov
 

Offline squadchannel

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Re: £25,000 Audiophile Pre-Amp repair video by Mend It Mark
« Reply #182 on: December 25, 2024, 10:14:27 am »
I would be too embarrassed to use a transparent case. :-DD :-DD :-DD :-DD
 
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Online coppercone2

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Re: £25,000 Audiophile Pre-Amp repair video by Mend It Mark
« Reply #183 on: December 25, 2024, 05:12:23 pm »
for the money it should have ITO coating and some RF fingers at least if it must be transparent   :-//

that might actually make it a unique product that does something new lol

There also exist fine RF screens that you can put on less visible parts to make it more shielded. They are pretty much see through like nylons.

The novel sales point being that it manages to have performance approaching a shoddy enclosure but its mostly transparent. And its not cheap materials so you can charge for that.
https://diamondcoatings.com/hard-coated-acrylic-sheets/


or for a budget ass option (for the poor person that bought that amp), its possible to retrofit with this stuff
https://lessemf.com/product/radiofilm/
« Last Edit: December 25, 2024, 05:17:15 pm by coppercone2 »
 

Online coppice

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Re: £25,000 Audiophile Pre-Amp repair video by Mend It Mark
« Reply #184 on: December 25, 2024, 05:25:58 pm »
That transparent version of the case is amazing. Did he think that people seeing the crude "first rough prototype" style internals would be an enhancing factor?
 

Offline tooki

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Re: £25,000 Audiophile Pre-Amp repair video by Mend It Mark
« Reply #185 on: December 25, 2024, 05:44:09 pm »
Imagine being Tom Evans now sitting there realising how badly you screwed up.
I think you’re being awfully generous in assuming he possesses that much self-awareness (or social intelligence)… I think his actions so far suggest he does not, and thus won’t realize it even later.
 

Offline andy3055

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Re: £25,000 Audiophile Pre-Amp repair video by Mend It Mark
« Reply #186 on: December 25, 2024, 07:03:06 pm »
A sucker is born every minute! These are good for people who buy directional audio cables  :-DD
 

Online themadhippy

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Re: £25,000 Audiophile Pre-Amp repair video by Mend It Mark
« Reply #187 on: December 25, 2024, 07:20:05 pm »
Quote
These are good for people who buy directional audio cables
Back in 2001'ish a certain Mr andrews claimed  in one of his sales blurbs that measuring cable directivty was  possible ,being curious i asked for more details on how they did it,and did get a reply

Quote
Dear Mad Hippy

Unfortunately we do not have any further information on this subject, only
what we have in the Booklet. I would suggest contacting Kimber in the US for
more detailed information on the equipment and the way they are able to
measure and set directionality.

Yours in Music

Peter Bevir
Sales Advisor

Russ Andrews Accessories Ltd.

However kimber never did get back to me
 

Offline Bud

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Re: £25,000 Audiophile Pre-Amp repair video by Mend It Mark
« Reply #188 on: December 25, 2024, 08:49:11 pm »
Do not forget to burn-in your directional audio cable before use !
« Last Edit: December 25, 2024, 08:57:45 pm by Bud »
Facebook-free life and Rigol-free shack.
 

Offline EEVblog

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Re: £25,000 Audiophile Pre-Amp repair video by Mend It Mark
« Reply #189 on: December 25, 2024, 09:45:44 pm »
Imagine being Tom Evans now sitting there realising how badly you screwed up.
I think you’re being awfully generous in assuming he possesses that much self-awareness (or social intelligence)… I think his actions so far suggest he does not, and thus won’t realize it even later.

We'll know if he copyright strikes another video. Nothing so far...
 

Offline andy3055

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Re: £25,000 Audiophile Pre-Amp repair video by Mend It Mark
« Reply #190 on: December 26, 2024, 02:23:09 am »
If all the manufacturers of various equipment, let alone audio gear, start claiming like he did, even Consumer Reports will have to close down. YouTube should have never taken it down in the first place and challenged him. It is not so hard to figure out that this is a disgruntled man.
 

Offline 5U4GB

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Re: £25,000 Audiophile Pre-Amp repair video by Mend It Mark
« Reply #191 on: December 26, 2024, 04:11:30 am »
Do not forget to burn-in your directional audio cable before use !

And dip it in liquid nitrogen to align the chakras.
 
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Offline Coordonnée_chromatique

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Re: £25,000 Audiophile Pre-Amp repair video by Mend It Mark
« Reply #192 on: December 26, 2024, 07:28:44 am »
A sucker is born every minute! These are good for people who buy directional audio cables  :-DD

Psycological problems are not that fun, chasing details like theses ones is just a perceptible symptom of paranoia, most normal people see it when it happens to them and fight against it unless it become unperceptible for them and all others... and some fall into "the rabbit hole" and grow their illness.
« Last Edit: December 26, 2024, 07:33:35 am by Coordonnée_chromatique »
 

Offline EEVblog

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Re: £25,000 Audiophile Pre-Amp repair video by Mend It Mark
« Reply #193 on: December 26, 2024, 07:54:13 am »
YouTube should have never taken it down in the first place and challenged him.
They have to react that way, that's how the system works. A human isn't going to look into the details of such a lengthy video.
 
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Offline SolderSucker

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Re: £25,000 Audiophile Pre-Amp repair video by Mend It Mark
« Reply #194 on: December 27, 2024, 02:29:23 pm »
New video which also covers Mend It Mark's video takedown from copyright attorney Leonard French:

« Last Edit: December 27, 2024, 02:38:48 pm by SolderSucker »
 
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Offline andy3055

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Re: £25,000 Audiophile Pre-Amp repair video by Mend It Mark
« Reply #195 on: December 27, 2024, 06:13:23 pm »
Yay!
 


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