I plan on playing shellac 78RPM records on my Technics turntable using a 3mil stylus made by Ortofon (https://www.ortofon.com/stylus-78-p-375). RIAA equalization was never used on the records so I'm looking for a phono preamp that does not apply RIAA equalization when played back. Does such a preamp exist? So far I can not find one.
Thanks,
Scott
Thanks,
Scott
Several have been published on here. Is this for live listening or for recording for further processing?
78s do use use equalization; just not what later got called "RIAA".
https://www.vinylengine.com/cartridge_database_record_equalization.php
https://sound-au.com/project91.htm
https://rfwilmut.net/notes/repro78/repro.html
http://www.shellac.org/wams/wequal.html
https://www.vinylengine.com/cartridge_database_record_equalization.php
https://sound-au.com/project91.htm
https://rfwilmut.net/notes/repro78/repro.html
http://www.shellac.org/wams/wequal.html
Can you insert a passive inverse RIAA filter to your existing phono pre?
For 78 playback, I think the Graham Slee Jazz Club phono preamp is quite good.
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It is possible; audio enthusiasts in the 1950's used to make preamplifiers with two rotary switches to set the equalization time constants. Each brand of shellac record had its own settings.
You have to equalize somewhere, where do you intend to do the equalization?
Also depends on whether you're thinking to build or buy.
If you're thinking to buy you could look for a used Monophonic made by a German fellow, Michael Fehlauer,
or hunt for something like an old HH Scott preamp. Then you'd have to refurb though. Several models had switchable eq. I read somewhere that the Fehlauer design was inspired by the Scott 121C. No idea if true.
If you're thinking to buy you could look for a used Monophonic made by a German fellow, Michael Fehlauer,
or hunt for something like an old HH Scott preamp. Then you'd have to refurb though. Several models had switchable eq. I read somewhere that the Fehlauer design was inspired by the Scott 121C. No idea if true.
Channel D Lino C can do that. I have one. It is a great transimpedance phono but works with low resistance mc cartridges.
No experience with this product, but I've owned and enjoyed other haglabs products.
https://www.haglabs.com/products/archiver-jfet-variable-equalization-phonostage
"The ARCHIVER is a very flexible phonostage designed to replicate any known equalization curve (36 in total), from 78rpm shellacs up to the modern era."
https://www.haglabs.com/products/archiver-jfet-variable-equalization-phonostage
"The ARCHIVER is a very flexible phonostage designed to replicate any known equalization curve (36 in total), from 78rpm shellacs up to the modern era."
I'm currently assembling this badboy. https://www.diyaudio.com/community/threads/sun-valley-sv-eq1616d.352858/
It might fit your needs.
I've also built 3 of the Hagerman kits, but not the ARCHIVER, and agree with rif above.
It might fit your needs.
I've also built 3 of the Hagerman kits, but not the ARCHIVER, and agree with rif above.
Seems reasonable, but is not that simple. No mechanical contraption can be flat. Most things with mass fall-off with frequency. Several acoustic devices rise with frequency (to a point). The inherent frequency response of the older acoustics resembles the early electrics (obviously, because they had to work interchangeably). Also the bandwidth was narrower, perhaps two octaves, so a token 6dB/Oct slope is not even 12dB off.
The OP wants to listen real-time, and needs some EQ. Several of the four links I posted show exactly how to do this. Sorry if that is not helpful. I would also respect Hagerman.
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