The £25,000 preamp that went wrong - Tom Evans Mastergroove

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To a degree, it is not relevant how it sounds. First challenge for any commercial product is to survive shipment. The mechanical design needs to be robust, because if it doesn't arrive fully functional who says how it will sound (and obviously, I mean regular shipping, not clear and obvious mishandling as is evident in the youtube video). Also, any commercial endeavour will need to provide customer service, and just stating it cannot be repaired is not cutting it (especially since it could clearly be repaired).
Those are the hurdles you need to take as a business owner, before the sound is taken into consideration.
The mechanical design is just extremely amateuristic, for comparison, look at one of Nelson Pass's products.
And you are right, it might sound good, we can't judge that from here.
To the contrary, how it sounds is what’s most relevant. As far as the condition of the unit in the video, that’s not damage from casual mishandling, it has obviously been tossed around by gorillas.
 
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If it was a DIY build, I'd say the builder had done a pretty decent job. For a GBP 25k product? C'mon! At least I expect better than mid-level DIY build quality. It should also be able to survive a trip in the mail.

Tom
I was talking about schematics. You are talking about price. Two different things.
C'mon!
 
Don't pivot? Dude get lost and go vent your frustrations elsewhere! I was replying to Brianco perfect example of well conceived DIY++ product at DIY prices.
..and why do you care so much? If I didn't know better, I'd say you were one of the six that bought this thing at full-tilt price!
Calm down. You offered up your opinion, and I responded to it. If you don’t like to be challenged, then don’t beg for one.
 
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Reputable manufacturers of a 25k gbp product would crate or at least double box the product and have high density foam inlay that would prevent such damage from ever occurring.
We do not know if it was shipped from manufacturer or some owner. We have no idea how it was packaged.
Not likely from manufacturer, it would be returned. Useless discussion without context.
 
I've heard a couple of these. A guy up the road has one and an acquaintance locally bought one a few month back. Both heard with sme v arms, one an sme 20 the other an avid acutus classic, both with Benz lp carts, which I also own.

Do not doubt that it a very good phonostage, it is excellent in all aspects. Compared to my Paradise it has a little bit more leading edge bite, but it's not quite as wall to wall in soundstage width.

Is it worth 25k? No, not in sound quality or build quality. There's a handful of diy designs that come close or match it for much less money, both Bonsai's and the Paradise for example.

Just my 2 cents.
 
I was talking about schematics. You are talking about price. Two different things.
No. I'm talking about the build quality. As others have also pointed out, the build quality here is fine for a prototype or a DIY project. It's not acceptable in a commercial product, GBP 25k or not. What good is the circuit if the build throws all the performance out the window ... and breaks the circuit in transit?

I also haven't seen any schematic of the part of the circuit that passes signal. Maybe it's in the video. I'm not about to waste 43 minutes of my life to find out. From what I saw it was a bunch of voltage regulators with a small board containing polystyrene capacitors for the phono stage. I didn't see anything worth going ooh! aah! over.

Tom
 
Standard well executed schematics.
Great. Do you have a link to them?

Mark of Mend it Mark is also quite entertaining as well as informative, a smart guy who is able to communicate effectively with the audience.
Yep. Of the YouTube repair videos out there he has some of the better ones. I'm still not willing to spend 43 minutes watching to get the schematics.

Tom
 
It starts at 10:30 and ends at 15:30.
Excellent. Thank you. That was helpful.

A nice feature of YouTube is that you can alter the speed to X2
I'm aware. That cuts it from 43 minutes to 21.5 minutes. Great. It would take me a split second to look at a schematic posted as an image.

Using multiple opamps in parallel for lower noise is a nice trick, but I question the idea of having nearly 70 dB of gain followed by a passive filter. Why not integrate the filter into the gain stage? I also question the umpteen regulators. That seems to be a marketing thing. Look Ma! We have regulators!

Instead of the raw PCB pieces used for "shielding" (they actually do nothing for that) how about putting this amp into a metal chassis? Couldn't find room for that in the GBP 25k selling price?

Tam
 
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... and breaks the circuit in transit?
I would imagine it comes with a free "at home" installation, so no actually shipping and therefor not designed to be moved or shipped. I could accept that for a 28k item. Sure, it could be easily designed to not break during shipping (especially considering the price). And if they are at it, why not create a less shoddy (in construction terms, not performance-wise) piece of hardware 8)
 
I also question the umpteen regulators. That seems to be a marketing thing. Look Ma! We have regulators!
Several builders of the Pearl 3 project have reported significant benefits with additional upgraded regulators and pre-regulators and separate power supplies per the Jung-Didden articles from way back.

I imagine that Jan's equipment is littered with Jung-Didden regulators (notwithstanding, perhaps, the "cobbler" effect).

DIY builders often proudly advertise the design provenance of the circuits on their casework. Commercial efforts too... for marketing purposes as well as acknowledgement. Nothing wrong with any of that.

Who would begrudge Jan displaying "Jung-Didden Super Regulation" on his projects?
 
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