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IIRC the PB worked best with a stereo input to better define noise and 
make the choice of switching between groove sides. Better to sum the 
channels post-PB.

joe salerno


John Eberle wrote:
> Playing 78s through an RIAA preamp basically  rolls off the highs and 
> boosts the lows dramatically altering the frequency  response from what it 
> should be . The RIAA pre-emphasis eq curve is applied  during the disc cutting 
> stage of 45 and LP record mastering . 78 RPM records  
> were not cut with RIAA pre-emphasis ; but rather were cut mostly  
> flat with perhaps some low end roll of to control the size of the bass  
> groove excursions . 
> 
> A simple and cheap way to playback 78 RPM records is  to connect the 
> turntable or tone arm audio out to the HI-Z microphone inputs  available
> on many preamps . This will give the flat response desired for 78s  and a 
> little low boost will bring the lows back in to proper perspective .  
> Also , most cartridges in current use for playing 78s are actually stereo  
> and of course 78s are mono . It is totally weird to hear a 78 RPM disc  
> being played with stereo clicks and pops . The cartridge can be wired in the  
> headshell to reproduce lateral mono modulation only . This makes the record  
> noise a lot less and less need for the Packburn or any other analog or digital 
>  transient noise reduction and better over all quality . 
> If anyone would like  an mp3 of one of my commercial 78s reproduced 
> in this manner , just contact  me off list and I will email it to you . 
> 
> John Eberle  : Over   27 years disc cutting experience and over 35 years in 
> Mastering  !
> AMERICANA CD MASTERING 
> 313 EAST COLLEGE STREET SUITE 3A
> DICKSON ,  TENNESSEE 37055
> 615-441-4660  
> 
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> less. (http://food.aol.com/frugal-feasts?ncid=emlcntusfood00000001)
>