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ARSCLIST  April 2015

ARSCLIST April 2015

Subject:

Re: "Best of both worlds" disk preamplifier

From:

Tom Fine <[log in to unmask]>

Reply-To:

Association for Recorded Sound Discussion List <[log in to unmask]>

Date:

Sat, 11 Apr 2015 18:03:25 -0400

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (122 lines)

Hi Corey:

I'd be OK with analog/manual switches and knobs, but you'd have to go co$tly if you don't want them 
to wear out. Figure this thing is not a set and forget device, people will be fiddling with the 
controls every time they put on a disk. That's a lot of hard use in a production environment.

Also, I agree with Richard and Paul, that's the way to go with outputs. Richard's suggestion is 
perfect, just throw a set of RCA-to-TS adapters in the box.

I don't think I included balanced inputs on my list, I agree with your point about them. I forgot if 
it was in this context or another that I said just use Henry Matchboxes if it's that critical. The 
only circumstance I can think of where it would be super-critical like that would be if you were 
looping through something like an old Pultec that really wants to feed a 600-ohm balanced device.

-- Tom

----- Original Message ----- 
From: "Corey Bailey" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Saturday, April 11, 2015 3:53 PM
Subject: Re: [ARSCLIST] "Best of both worlds" disk preamplifier


> Hi Tom,
>
> Thanks for bringing up this topic as I'm currently designing a restoration phono preamp for my own 
> use. I'm doing this simply because it's been awhile since I've built anything electronic or done 
> any board level work and I feel the need to scratch that itch.
>
> I'm basically going to build in everything on your wish list except for a couple of things:
>
> Unbalanced (phono) inputs only The only reason I can see for balanced inputs is for a line input 
> to the EQ sections (an outboard option I already have). Besides, to do this requires more 
> amplifier stages (even if unity gain) and I want to keep the active stages to a minimum.
>
> The outputs will be both balanced and unbalanced.
>
> You wrote:
> <SNIP>”What I'd like to see built and marketed is a disk preamplifier that does the initial 
> impedence and capacitance match with the cartridge and the first stage of amplification, then 
> offers bridged output off that stage, goes on to do a passive EQ with all the turnover and rolloff 
> options, and then an output stage. So, a person could play a disk once (efficient workflow), make 
> a flat transfer to a separate digital file, and do the EQ to the best of their expertise and 
> taste -- so there is immediately a usable/listenable copy for researchers, library clients, 
> online, reissue or whatever. The idea of making two passes doesn't fit budget-constrained 
> workflows, and many of us are not at all sold on digital EQ (which also takes extra time and extra 
> steps after playback, again inefficient). The device I describe offers the best of both worlds --  
> you get that flat transfer to archive and do whatever in the digital domain at some later time, 
> but you end up with a listenable/usable sound file at the same time.” <SNIP>
>
> I plan on building my preamp as a dual-mono piece of gear with a coupling switch that allows for 
> an EQ'd and Flat transfer simultaneously (or any combination thereof). Alternatively, it will have 
> RIAA EQ options and be able to be used as a stereo phono preamp.
>
> By “passive EQ”, I presume you mean an RC network in front of an amplifier stage.
>
> I'm still on the fence regarding impedance/capacitance matching for my own use because I only use 
> the usual “standard” cartridges. It's an easy add-on though.
>
> Regarding your “Dream Preamp” comments:
> If you want to keep the end result as clean and as “esoteric” as possible (which I plan to do), 
> you avoid things like VCA's, relays and anything digital or even CMOS. It's only going to be hand 
> operated, gold contact switches and minimal amplifier stages.
>
> That said, I'd like to see more opinions and wish list features regarding this thread.
>
> Corey,
> Corey Bailey Audio Engineering
> www.baileyzone.net
>
>
>
> On 4/11/2015 5:46 AM, Tom Fine wrote:
>> Does anyone know of any reviews of this unit similar to Gary Galo's testing of the KAB preamp? 
>> Maybe that's fodder for an ARSC Journal article -- a testing and features shootout between this 
>> unit, KAB, the LOC Preamp and the TDL Restoration preamp. Maybe throw in an old McIntosh or 
>> Marantz for comparison.
>>
>> One thing I'd love to see on my "dream preamp" would be a digital-logic control panel for the EQ, 
>> rather than rotary switches or pushbuttons. I'd prefer the audio to be confined to a PC board, 
>> where all the EQ components could be laid out with short signal paths, with routing done by 
>> little micro-relays or whatever they're using these days. And of course separate controls for 
>> turnover and rolloff.
>>
>> Calibrated precision output levels may be useful for some folks. I notice that the unit Parker 
>> distributes has VCA controlled outputs, which is a good idea. Using a digital-logic user 
>> interface could accomplish this with VCA's.
>>
>> -- Tom Fine
>>
>> ----- Original Message ----- From: "Parker Dinkins" <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: Saturday, April 11, 2015 8:19 AM
>> Subject: [ARSCLIST] "Best of both worlds" disk preamplifier
>>
>>
>>>> Date:    Fri, 10 Apr 2015 08:00:14 -0400
>>>> From:    Tom Fine <[log in to unmask]>
>>>> Subject: "Best of both worlds" disk preamplifier
>>>
>>> <snip>
>>>
>>>> The device I describe offers the best
>>>> of both worlds -- you get that flat transfer to archive and do whatever in the digital domain 
>>>> at
>>>> some later time, but you end up with a listenable/usable sound file at the same time.
>>>
>>> <snip>
>>>
>>> These preamplifiers have been available for some time:
>>>
>>> http://www.masterdigital.com/24bit/vadlydmd12.htm
>>>
>>> —
>>> Parker Dinkins
>>> www.masterdigital.com
>>>
>>>
>>
>
> 

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