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General Discussions => Brewery => Topic started by: nashkato on October 26, 2019, 02:32:23 AM

Title: personal Vinyl cutter : phonocut
Post by: nashkato on October 26, 2019, 02:32:23 AM
https://www.kickstarter.com/projects/phonocut/phonocut-home-vinyl-recorder/faqs
what do you guys think ?
10-15 minutes per side on 10"
stereo 1/8" unsymetrical input
Title: Re: personal Vinyl cutter : phonocut
Post by: gyraf on October 26, 2019, 04:22:22 AM
no way it's going to be decent quality sound.

there's a reason the cutting lathes were so expensive.

/Jakob E.
Title: Re: personal Vinyl cutter : phonocut
Post by: bluebird on October 26, 2019, 02:26:40 PM
I saw that! I'm excited because now I can work from home 8)
Title: Re: personal Vinyl cutter : phonocut
Post by: Tubetec on October 26, 2019, 04:14:37 PM
I think theres been a few commercial attempts at this idea before ,
I forget which company it was now but back in the early 2000's one of the bigger Dj electronics companies
had a mini lathe for sale , maybe it was Numark ,Stanton or Vestax I cant remember which .
It basically worked as spec'd ,even though spec was a fair bit below what a proper vinyl pressing company could achieve , it was still handy for DJ's to print their own material to wax and bring out to clubs .

Is that 398 dollars he has pledged or 398,000  :D

Title: Re: personal Vinyl cutter : phonocut
Post by: mjrippe on October 26, 2019, 09:16:43 PM
The comparison clip had several seconds of the original recording and pro lathe cut followed by two seconds of their machine.  I wonder why?  The voice recording had obvious distortion.
Title: Re: personal Vinyl cutter : phonocut
Post by: JohnRoberts on October 27, 2019, 10:35:24 AM
I usually irritate people when I say what I think about vinyl, but indeed this is unlikely to accidentally work better than existing technology.

It would be interesting if they did come up with something that didn't totally suck, and surprising too.

JR
Title: Re: personal Vinyl cutter : phonocut
Post by: pucho812 on October 27, 2019, 11:39:35 AM
there where guys at Namm with something similar

here is their website and still their unit is desktop friendly...


https://www.vinylrecorder.com/ (https://www.vinylrecorder.com/)

Title: Re: personal Vinyl cutter : phonocut
Post by: abbey road d enfer on October 27, 2019, 11:47:07 AM
I usually irritate people when I say what I think about vinyl, but indeed this is unlikely to accidentally work better than existing technology.

It would be interesting if they did come up with something that didn't totally suck, and surprising too.

JR
Since statistically 75% of the newly bought vinyl discs end up not being played, who cares about sound quality?
Title: Re: personal Vinyl cutter : phonocut
Post by: Winston O'Boogie on October 27, 2019, 08:17:37 PM
There was a time when I preferred original pressings of old classic albums over some of the dubious CD re-releases that were churned out in the beginning.
I think we have good re-mastered versions of the usual suspects these days so I'm happy playing from digital. 

Comparing an old, original, 1st generation master tape directly to a top-end converter generated file can sometimes leave me feeling something was lost though.
Off topic a bit I know, soz.

Title: Re: personal Vinyl cutter : phonocut
Post by: JohnRoberts on October 27, 2019, 10:51:48 PM
There was a time when I preferred original pressings of old classic albums over some of the dubious CD re-releases that were churned out in the beginning.
I think we have good re-mastered versions of the usual suspects these days so I'm happy playing from digital. 

Comparing an old, original, 1st generation master tape directly to a top-end converter generated file can sometimes leave me feeling something was lost though.
Off topic a bit I know, soz.
I wrote about this in the 80s. In the early days of digital they tried to print master tapes to digital media without "sweetening" (post processing to compensate for vinyl losses). However many master tapes were already mastered with the HF hot to survive the losses from vinyl processing. Printing a HF hot master tape flat, ended up way too hot, too much of a good thing.  ::)

I worried for a while that I might not find digital versions of obscure recordings, but so far I have found digital versions of every one of my old albums that are too trashed to play with a needle.

JR
Title: Re: personal Vinyl cutter : phonocut
Post by: Tubetec on October 28, 2019, 06:51:44 AM
I do remember in particular Polydor's earlier CD reissues of classic albums were a crock of sh*te ,not only that but the error rate on the disks continued to worsen over time as the top surface laquer wasnt right and the aluminium oxidised, typically in more modern times the top layer of disks in painted to provide protection , The original Live at Leeds cd was one that wasnt properly mastered for years , eventually polydor  reissued it with additional bonus tracks . Hendrix cds under that same  label were rubbish too for years ,until they finally went back a did the job over .   

Dont the pros in vinyl cutting use something like 50 w/ch to the cutter heads , and use really specialised EQ's ,
Maybe theres a chance in the modern era to use dsp processing to simplify the equipment .

Vestax VRX2000 , that was the machine I was thinking of .  Looks nice ,but Im not sure about availabillity of blank disks ,its also rare as it wasnt in production for long .
Title: Re: personal Vinyl cutter : phonocut
Post by: abbey road d enfer on October 28, 2019, 09:42:31 AM
Dont the pros in vinyl cutting use something like 50 w/ch to the cutter heads , and use really specialised EQ's ,
IIRC, the amps in the SAL74 claimed 700W peak power.
Title: Re: personal Vinyl cutter : phonocut
Post by: JohnRoberts on October 28, 2019, 10:20:29 AM
I do remember in particular Polydor's earlier CD reissues of classic albums were a crock of sh*te ,not only that but the error rate on the disks continued to worsen over time as the top surface laquer wasnt right and the aluminium oxidised, typically in more modern times the top layer of disks in painted to provide protection , The original Live at Leeds cd was one that wasnt properly mastered for years , eventually polydor  reissued it with additional bonus tracks . Hendrix cds under that same  label were rubbish too for years ,until they finally went back a did the job over .   
yup... As an early defender of digital I had to deal with audiophools who considered the digital technology tragically flawed.. Some probably still do.  ::) Early digital was far from perfect but generally an improvement over typical consumer playback of the day.

In addition to a mastering step where an engineer tweaked the master for the vinyl process, there was a "sweetening" step to review and tweak flawed mixes. So two sets of experienced ears before release to correct/improve the raw product.

The double edged sword of digital media is that you can print your mix without these additional review steps (for better and worse).
Quote
Dont the pros in vinyl cutting use something like 50 w/ch to the cutter heads , and use really specialised EQ's ,
Maybe theres a chance in the modern era to use dsp processing to simplify the equipment .

Vestax VRX2000 , that was the machine I was thinking of .  Looks nice ,but Im not sure about availabillity of blank disks ,its also rare as it wasnt in production for long .
Of course it is possible to improve the vinyl process. How good it could ever get stands to be seen.

JR

PS: My dad was a recording engineer way back when... we had an old Western Electric amplifier from the 1930s in our basement. I estimate it was no more than a couple tens of watts. I speculate it was an old cutting amp, since audio playback amplifiers were generally lower power than that.  That old WE amp filled up a 19" rack to maybe 4' tall. My dad was using it to drive the one loud speaker in our living room. That basement amp was upgraded/replaced by a RCA consumer (tube) amp in the early 50s  that was shoe box sized and fit in the living room next to the record player.
Title: Re: personal Vinyl cutter : phonocut
Post by: Winston O'Boogie on October 28, 2019, 11:13:33 AM
There's no doubt that a lot of early CD releases of Zeppelin, Hendrix, Who, et al.  were quite crap.   It also seemed to coincide with the trend of removing tone controls on pre/power amps which, with a slight tweak, could have improved things somewhat.

I don't own any physical media these days, everything I want to listen to is on a hard drive server.  I do miss the packaging and experience of buying and opening a new album, especially the vinyl gatefold sleeves. The whole thing was more immersive.

John, your dad's 1930's Western Electric amp from the basement would probably realise a few $K these days if you'd thought to rescue it  ;)
Title: Re: personal Vinyl cutter : phonocut
Post by: JohnRoberts on October 28, 2019, 11:56:57 AM
There's no doubt that a lot of early CD releases of Zeppelin, Hendrix, Who, et al.  were quite crap.   It also seemed to coincide with the trend of removing tone controls on pre/power amps which, with a slight tweak, could have improved things somewhat.

I don't own any physical media these days, everything I want to listen to is on a hard drive server.  I do miss the packaging and experience of buying and opening a new album, especially the vinyl gatefold sleeves. The whole thing was more immersive.

John, your dad's 1930's Western Electric amp from the basement would probably realise a few $K these days if you'd thought to rescue it  ;)
I turned the two foot tall power supply section into a DIY 4x200W audio amp back in the early 70s. The DIY amp design borrowed liberally from popular amps of the time (BGW, Flame Linear, etc. but was not a direct copy of anything.) The power transformer weighs 65# by itself.  I repurposed the 3 position power switch to provide an inrush series power resistor to reduce current surges from initial turn on, the second on position shorts out the series resistor and connects the speaker relays for popless turn on/off. 

I think I still have one of the three WE sections sitting out in my laundry/tool room. In my judgement it isn't worth the cost to ship it.  The now missing third section probably got dragged to my street for junk day some time ago... Remarkable that I moved the junk around the country with me for decades. I'm sure it is missing any valuable rare parts. As I recall it had some odd mechanical design features related to isolating the amplifier tubes. The power supply section had 4 huge rectifier tubes mounted through the front panel.

Since I am now in the mode of throwing away rather than accumulating junk this too will go.

I now have 6 channels of class D (Hypex) amps for my living room system.   Technology is good.

JR
Title: Re: personal Vinyl cutter : phonocut
Post by: Gold on October 28, 2019, 12:29:04 PM
This machine is a home recorder more akin to a ‘dub plate cutter’ like a Presto or Rek-O-Kut than a professional machine like a Neumann or Scully. As I understand it it has DSP so it’s difficult to blow up the cutter-head

The peak power of the SAL rack is 600W.  The way to measure power as related to audio is joules over time. Only high frequency requires power. A 1K sine wave would draw less than 1W.  Peak power is needed for clean reproduction of transients. In the days of tape and transformers this was more important than in the era of poorly implemented GBW IC’s and tizzy Chinese mic’s.
Title: Re: personal Vinyl cutter : phonocut
Post by: gyraf on October 29, 2019, 07:04:56 AM
..tizzy is a good word..
Title: Re: personal Vinyl cutter : phonocut
Post by: abbey road d enfer on October 29, 2019, 07:38:47 AM
what do you guys think ?
10-15 minutes per side on 10"
It's a somewhat unusual format, but who wants LP's today? I guess DJ's are perfectly happy with this format. They say they're working on a 45rpm version; there would be a market for juke-box fans.

Quote
stereo 1/8" unsymetrical input 
  It's a tad annoying for pro audio people, but perfectly hip for i-phone freaks.


My major concern is they have no built-in aspiration; for demos, it seems they use a standard vacuum cleaner. It's too bad, because their claim of fully automatic operation falls down on that point. Indeed full microprocessor control should make disc-cutting a routine task, eliminating human decisions about manipulation of the cutter controls, which, ever since, have been a large part of the art.
Title: Re: personal Vinyl cutter : phonocut
Post by: PRR on October 29, 2019, 07:08:44 PM
> aspiration

The "portable"(hah) cutter I had used no sucker. A camel hair brush and an oversize spindle wrapped-up the swarf.
Title: Re: personal Vinyl cutter : phonocut
Post by: Winston O'Boogie on October 30, 2019, 07:01:18 PM
For sh*ts and giggles I went over to a mate's house and listened to a few tracks from a couple of albums I played on in the late '80's that were released on vinyl.  All analogue recordings.
Granted these were for Atlantic Records with biggish budgets and were mastered by Bob Ludwig.  Even though the vinyl is obviously technically inferior in lots of ways, it sounded very close to how I remembered things.  I couldn't say the same for a CD copy I compared one of them to.    This is a fairly recent digital transfer/re-mastering job that was done but, honestly, the only digital copy I think I liked is one I did myself from the vinyl through a decent phono pre amp and converter about 25 years ago.

Naturally, none of this relates to this new Rek-O-Kut which won't have a magic Bob Ludwig preset, but it did surprise me how much more I preferred the experience of the ancient technology. 








Title: Re: personal Vinyl cutter : phonocut
Post by: Gold on October 30, 2019, 07:26:46 PM
but it did surprise me how much more I preferred the experience of the ancient technology.

It’s a forest and trees thing. A record is an enjoyable listening experience. I usually listen to a side of a record all the way through without distractions. CD/digital not so much.

You can focus on specs and come to the conclusion that records are wholly inferior or you can listen and come to the conclusion that they sound pretty good.
Title: Re: personal Vinyl cutter : phonocut
Post by: abbey road d enfer on October 30, 2019, 07:40:30 PM
I listen regularly to vinyls, since many have not been released in CD format. I have  a rather decent turntable and a very good cartridge; it sounds good but I'm not blown away. I made comparisons of tracks by Eddie Cochran, Elvis Presley and the Shadows and I couldn't tell a significant quality difference; sometimes I noticed differences due to different processing, though.
Different people, different experience, I guess...
I believe if I made the same comparison between a current release, I would note the ravages of the loudness war on the CD edition.
Title: Re: personal Vinyl cutter : phonocut
Post by: Gold on October 30, 2019, 08:42:20 PM
I  try to avoid  wading into subjective discussions about records. I will say that weakness of records are also their strengths in a lot of ways.

The ear tends to like the things you have to do to have a good sounding record.  A record isn’t a perfect medium. That  it’s still viable is a testament to remarkably good design for 19th century technology.
Title: Re: personal Vinyl cutter : phonocut
Post by: Gold on October 30, 2019, 10:15:22 PM
Quote from: Winston O'Boogie link=topic=73604.msg932275#msg932275 date


By the way, I went on a bit of  YouTube binge after comparing vinyl to CD at my mate's and I've just watched one with you  "For The Record: All-Analog Mastering" Johnny Rock and Friends.  Much respect and admiration  :)

Thanks. I thought that video came out well.  I’m glad you liked it.  I had nothing to do with the video part.
Title: Re: personal Vinyl cutter : phonocut
Post by: Winston O'Boogie on November 04, 2019, 12:17:32 PM
Thanks. I thought that video came out well.  I’m glad you liked it.  I had nothing to do with the video part.

I'd love to read/see more about your preview Ampex machines and also your custom A & B path desk.  Is there anywhere you've talked about that stuff? 
Title: Re: personal Vinyl cutter : phonocut
Post by: JohnRoberts on November 04, 2019, 01:09:41 PM
I had this conversation with John several years ago, and he apparently still doesn't believe me.  He rebuilt a 43 amp into a SS power amp chassis, and it's news to me now that he still might have one of the other amps (41 or 42).   They'll each bring north of $10K in about any condition these days, or if it's just a salvageable faceplate there's a WE collector out there somewhere who will pay around a grand just for that part, or more for any collection of unobtainium replacement parts.  But, he can take it to the dump if he wants.
I will gladly gift you the E-41-C sitting out in my laundry room, if you pay shipping. It is untouched but IIRC is missing the tube compartment that hung off the front, unless I am confusing it with the third piece.

As I recall these were pretty heavy so will not ship well in a cardboard box...

I suspect we had this exact conversation before.  So tag you are it (again?)... you want it... FREE, just figure out shipping? I am about ready to carry the 41-C to the curb after humping it around the country with me for several decades. 

I think I threw away the third WE piece already (you could have it too but I don't see it around). My hifi amp built into a WE 43-A still works (although I don't use it) and it probably weighs more than 100# (the transformer I put in there is 65# all by itself).
====
I have discarded probably tens of thousands, new cost, of old computers/test equipment that I first tried to sell. I did find interest in some of the more classic old stuff (even the old heathkit stuff), but that interest waned when shipping costs had to be covered. Shipping costs have only increased since then.

JR
Title: Re: personal Vinyl cutter : phonocut
Post by: EmRR on November 04, 2019, 01:51:31 PM
OK John, I'll follow up on this again. 
Title: Re: personal Vinyl cutter : phonocut
Post by: Gold on November 04, 2019, 04:50:46 PM
I'd love to read/see more about your preview Ampex machines and also your custom A & B path desk.  Is there anywhere you've talked about that stuff?


My preview machines are Studer A80VU pre machines. I have three. One set up for 1/4" and another for 1/2". Both were gone over with a fine tooth comb by Dan Zellman who is an old school NY tech who is/was Studer certified. The third preview machine is a custom made 1" preview deck. It's the only one in existence AFAIK. It was pieced together by Dan Zellman and John French. John made the head block and Dan did the transport and audio electronics.

I also have a 1/4" Telefunken M15 (not M15A)  preview machine. It was restored by Midnight Bob Shuster. He did an excellent job. That only does 7.5ips and 15ips so is not used as much. I also have an A80RC with 1/4" and 1/2" heads for recording as it's the only deck I have that records. Bob went over the A80RC too.

I have a thread going about the A/B path console. It's called "Shaker Desk". If you are unfamiliar the Shakers were a religious group in Upstate NY and New England in the late 1800's that made incredible furniture. It's very austere. There is no adornment. the simplicity of function over form is a very modern concept. One of the operating principles of the console is hot have the right number of controls for me. Not one more and not one less than ideal.

I'm in year 12 of construction. I had never put a time frame on it before. It's done when it's done. I am now closing in on the finish line. I expect it to be done by June 2020. Then I can start rebuilding everything:) The thread is at the link.
https://www.tapatalk.com/groups/prorecordingworkshop/shaker-desk-t19405751.html
Title: Re: personal Vinyl cutter : phonocut
Post by: JohnRoberts on November 04, 2019, 04:56:18 PM

My preview machines are Studer A80VU pre machines. I have three. One set up for 1/4" and another for 1/2". Both were gone over with a fine tooth comb by Dan Zellman who is an old school NY tech who is/was Studer certified. The third preview machine is a custom made 1" preview deck. It's the only one in existence AFAIK. It was pieced together by Dan Zellman and John French. John made the head block and Dan did the transport and audio electronics.

I also have a 1/4" Telefunken M15 (not M15A)  preview machine. That only does 7.5ips and 15ips so is not used as much. I also have an A80RC with 1/4" and 1/2" heads for recording as it's the only deck I have that records.

I have a thread going about the A/B path console. It's called "Shaker Desk". If you are unfamiliar the Shakers were a religious group in Upstate NY and New England in the late 1800's that made incredible furniture. It's very austere. There is no adornment. the simplicity of function over form is a very modern concept. One of the operating principles of the console is hot have the right number of controls for me. Not one more and not one less than ideal.
The Shakers were famous for prohibiting sex between followers. For some funny reason they died out...  ::) ::)

JR

PS: I vaguely recall shaker chairs as being collectable.
Quote
I'm in year 12 of construction. I had never put a time frame on it before. It's done when it's done. I am now closing in on the finish line. I expect it to be done by June 2020. Then I can start rebuilding everything:) The thread is at the link.
https://www.tapatalk.com/groups/prorecordingworkshop/shaker-desk-t19405751.html
Title: Re: personal Vinyl cutter : phonocut
Post by: Gold on November 04, 2019, 05:24:12 PM
The Shakers were famous for prohibiting sex between followers. For some funny reason they died out...  ::) ::)

JR

PS: I vaguely recall shaker chairs as being collectable.

Yeah, places like the Museum of Modern Art collect it.
Title: Re: personal Vinyl cutter : phonocut
Post by: Winston O'Boogie on November 04, 2019, 05:58:26 PM
Thanks for the rundown on your Ampex machines Paul.   Building a 1" preview machine shows massive determination and dedication but then this:

I'm in year 12 of construction. I had never put a time frame on it before. It's done when it's done. I am now closing in on the finish line. I expect it to be done by June 2020. Then I can start rebuilding everything:) The thread is at the link.
https://www.tapatalk.com/groups/prorecordingworkshop/shaker-desk-t19405751.html

Wow!  The name is perfect for the concept, The whole look is organic and oozes with your DNA.   This is a desk you'd want your vinyl mastered through.
I've bought Shallco switches myself in the past and they sure were expensive for a 3 deck switch,  but then there's your 12 deck H pad switch!  I bet you know you're switching something when you turn that thing 😄
Again, respect.
Title: Re: personal Vinyl cutter : phonocut
Post by: Gold on November 04, 2019, 06:24:30 PM
Thanks John. That means a lot from someone with your deep audio knowledge.
Title: Re: personal Vinyl cutter : phonocut
Post by: Winston O'Boogie on November 04, 2019, 07:21:30 PM
Thanks John. That means a lot from someone with your deep audio knowledge.

The stuff I don't know runs much deeper,  bravado and swagger can embellish the stuff I do 😜
Title: Re: personal Vinyl cutter : phonocut
Post by: Tubetec on November 04, 2019, 08:16:43 PM
Id never witnessed the dark art of vinyl cutting before ,
Maybe in the next generation of the console you could add stepper motors to the rotary switches for fast recall  ,
might save having to duplicate every  control twice to facilitate changeover between tracks .

Title: Re: personal Vinyl cutter : phonocut
Post by: Gold on November 04, 2019, 08:38:20 PM
Id never witnessed the dark art of vinyl cutting before ,
Maybe in the next generation of the console you could add stepper motors to the rotary switches for fast recall  ,
might save having to duplicate every  control twice to facilitate changeover between tracks .

I would have no idea how to do that. I’m not sure it would work. Changeover needs to happen silently without muting the console. That would mean redesign  everything with VCA’s. I don’t know how to do that either and wouldn’t want to if I did.

Besides that I like the visual feedback of both halves of the board. Another reason not to do that is I can use each half of the board separately if I want. I can do a dummy  run for a side on the B half while  doing digital mastering on the A side of the board. I don’t see it as an advantage.
Title: Re: personal Vinyl cutter : phonocut
Post by: PRR on November 04, 2019, 08:46:07 PM
> The Shakers were famous for prohibiting sex between followers. For some funny reason they died out...  ::) ::)

Two are still living (down from 5,000+).  However they have hired goyim as household help and to staff the museum/store.
Title: Re: personal Vinyl cutter : phonocut
Post by: bluebird on November 04, 2019, 09:17:40 PM
I cut everyday on a VMS66 like Paul (I think you have a VMS66 right?) I also have a Studer with a preview head. It sits around and collects dust though. I much prefer cutting from digital sources. I feel I can provide a better cut with all the plugins available now. One of the hardest thing about getting audio to the lacquer at a decent level is controlling high end. Also a reason why records are considered "warm". Your always filtering high end. One of the first records I was tasked with cutting years ago was Coltrane's Blue Train. I was using HD digital files from the original tape. There was so much cymbal energy on it. I was told to do it "flat" EQ wise by people who didn't know anything about cutting. I popped the breaker on the lathe twice which protected the cutter head from overheating. But eventually got it on there. Only to later learn that thats definitely not how people want to hear the record and ended up recutting it with quite a bit of high end lopped off. Somewhere out there there are a couple really bright versions of Blue Train... 8)

Point being there is a medium that can be met with look ahead digital de-essers. Where you don't have to just lop off high end with a filter but take care of just the amount you want. You get to add more artistry to the sound instead of being confined to what the medium demands using only analog tools. That said there is something magical about having the limitations of analog in the same way a full band in a room recording to tape does. Making full use of a split console and a Studer is a real performance and not many people can do it.



P.S. Paul you should check out the Fab Filter DS De-Esser for cutting if you haven't already. its pretty amazing at reducing "splatting" without reducing perceived high end. Takes a second to learn it but worth the effort. It seems to just take out the specific frequencies that are essing instead of gain reducing a high shelf like most do. Another tool in the box...
Title: Re: personal Vinyl cutter : phonocut
Post by: Gold on November 04, 2019, 09:42:23 PM
I cut everyday on a VMS66 like Paul (I think you have a VMS66 right?)


P.S. Paul you should check out the Fab Filter DS De-Esser for cutting if you haven't already. its pretty amazing at reducing "splatting" without reducing perceived high end. Takes a second to learn it but worth the effort. It seems to just take out the specific frequencies that are essing instead of gain reducing a high shelf like most do. Another tool in the box...


I cut on a
VMS66/VG66/SX74.

I have a pair of Maselec MDS2 high frequency limiters. One for each side of the console. I even have unfinished faceplates for them so I can make them match the eventual engraved faceplates.

I will also start out with a pair of Maselec multi band compressors until I can con someone into designing the MB comp I want.  I’m not wanting for HF control.

I don’t feel constrained with analog tools. I use a MB comp plug in along with the Maselec MB but the MB I want designed would make that unnecessary.

This is the MB compressor idea. Someone please steal it.

https://groupdiy.com/index.php?topic=70580.0





Title: Re: personal Vinyl cutter : phonocut
Post by: EmRR on June 22, 2020, 01:27:12 PM
I will gladly gift you the E-41-C sitting out in my laundry room, if you pay shipping. It is untouched but IIRC is missing the tube compartment that hung off the front, unless I am confusing it with the third piece.
I suspect we had this exact conversation before.  So tag you are it (again?)... you want it... FREE, just figure out shipping? I am about ready to carry the 41-C to the curb after humping it around the country with me for several decades. 
JR

Follow-up:  JR sent it to me, and we ran the value experiment.    I hit all the collectors I know and got a lot of tire-kicking.   Everyone wanted it, but the missing parts on the front meant no one wanted to spend real money.   I was told enough times by enough people that the missing parts would probably cost $2K to get custom made.  Lots of 1/4" brass parts, custom brass screws, etc.    In the end there's $500 to go to GroupDIY site costs, and I'm sending that shortly. 
Title: Re: personal Vinyl cutter : phonocut
Post by: JohnRoberts on June 22, 2020, 01:46:46 PM
Follow-up:  JR sent it to me, and we ran the value experiment.    I hit all the collectors I know and got a lot of tire-kicking.   Everyone wanted it, but the missing parts on the front meant no one wanted to spend real money.   I was told enough times by enough people that the missing parts would probably cost $2K to get custom made.  Lots of 1/4" brass parts, custom brass screws, etc.    In the end there's $500 to go to GroupDIY site costs, and I'm sending that shortly.
Here's where I get to admit I was wrong (again)....

I was ready to drag this to the street for junk collection but Doug was convinced that this was worth something.  I packed this up (double boxed) and paid the $60+ UPS shipping cost (it was heavy), if Doug would donate the proceeds to the forum.

I admit I was wrong and the forum benefits (probably a win win for some).

Thank you Doug for converting this to Benjamins...

JR   
Title: Re: personal Vinyl cutter : phonocut
Post by: EmRR on June 22, 2020, 02:18:43 PM
Glad it’s being restored by someone, and some funds are helping this place. 
Title: Re: personal Vinyl cutter : phonocut
Post by: abbey road d enfer on June 23, 2020, 12:43:55 AM
This is the MB compressor idea. Someone please steal it.

https://groupdiy.com/index.php?topic=70580.0
Been doing some grave-digging and I see your concept is not too distant from a product I had in the 1980's, that I mentioned briefly in the other thread (post #74).
It was a 4-band; 5 band would have resulted in too narrow bands that would result in too much interaction between bands.
However, since you seem content with 1st order filters, that would not be an issue.
It had two rectifiers, one with a typical rms timing (tuned to each band) for compression and a fast one for peak limiting and gating.
Avery small number has been made (less than 100); I often get calls of people (kids?) who are looking for them. One of them has even endeavoured to start a new production. It'll take some time since all blueprints and PCB files are gone; anyway a redesign is necessary since the rms detectors 2252 don't exist anymore, and there's an opportunity to use THAT I/O circuits.
Anyway, it would not be very difficult for me to design the product you want. Producing the schematic would take only a few days, but before, there's a couple of things that need be discussed, in particular the construction. I would think modular is de rigueur.I doubt it would fit in a standard 3U Eurorack, so is a 6U acceptable or should we design a custom enclosure with a dedicated backplane? That determines how the schemo is articulated.
I don't have access anymore to some of the facilities I had before, particularly for construction and we certainly don't have access to the variety of resources we had 40 years ago (ordering pots and switches is almost like organizing D-day).
I would suggest we continue person-to-person.
I'll PM you my e-mail address.
Title: Re: personal Vinyl cutter : phonocut
Post by: Ethan on June 23, 2020, 02:46:39 AM
Wow. Thank you all so much. That was incredibly generous guys!