Re: [ARSCLIST] Non-RIAA preamp

[phillip holmes <insuranceman@xxxxxxxxxx>]

In the phase encode/decode discussion of RIAA, did anyone mention that 
speed is critical?  If the disk was recorded slow or fast, you'll have a 
hard time getting proper frequency response.  And many older playback 
decks ran slow or fast, again making the frequency response and phase 
wrong.  But the absolute worst is off centered pressings that cause a 
constant change in phase and frequency response.  Makes me sick on 
really bad ones.  AND, many RIAA stages are off by at least 1dB.  If you 
compound all the errors, it's enough to make you listen to MP3.  Oh, 
let's not forget tangency error, groove pinch....  It's a wonder they 
sound as good as they do.  The best solution for these problems would be 
to play back on a Nakamichi turntable  (automatic disk centering) and 
introduce RIAA in the computer.  Sadly, I don't have the Nakamichi 
table.  But can't you fix the speed in the computer, then do RIAA?  I'm 
going to get someone to show me how to do that one of these days. 
Phillip

Parker Dinkins wrote:
> on 9/9/06 8:56 PM US/Central, steven c at stevenc@xxxxxxxxxxxxxx wrote:
>
>   
> > About 20-odd years ago, I had a Heathkit receiver...forget the
> > model. Anyway, it had been written up in audio magazines as probably the
> > best receiver then available...and it had (I think only in FM stereo mode)
> > a "Phase" control which could be used to put the two stereo channels in
> > correct phase (a problem so far not mentioned in this thread).
> >     
>
>
> Maybe it was this one:
>
> http://cgi.ebay.com/Heathkit-AJ-43-AM-FM-Stereo-Tuner-VGC-NR_W0QQitemZ110027
> 423676QQcmdZViewItem
>
>
> Enlarged photo showing "Stereo Phase - Pull to Set" control
>
> http://www.aphenos.net/ebay/auctions/aj43/3.jpg
>
>
> ---
> Parker Dinkins
> MasterDigital Corporation
> Audio Restoration + CD Mastering
> http://masterdigital.com
>
>
>
>