[TechAssist] Re: Best way to clean a head.
- From: Dennis Viereck <wa6ati@xxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 26 Nov 2001 07:09:00 -0800
Clint:
If you did the math you will find that the HI-FI head to tape velocity
should increase or decrease the overall velocity by less than 1 inch per
second. This insignificant amount is hardly enough to worry about when
the compared to the actual velocity is 19.03 fps. This is only 0.00045%
difference. Hardly enough to get any measurable difference in audio
quality.
Dennis Viereck
"OrpheusComputing.com Repair" wrote:
> Yeah, that's sort of what I said in an earlier email...it can
> show on paper in many cases, but not an audible difference
> because the specs are so good to start with. Back when hi-fi
> audio specs were checked and included in reviews (about 15yrs
> ago in "Stereo Review" and "High Fidelity" magazines, and in
> the owner's manuals from 10-15 yrs ago, usually the EP speed
> had about 1khz more on the high end, and less than a 3db
> increase on S/N ratio. When dealing with SN ratios of above
> 75db, of course you won't hear a difference of 3db, and with
> frequencies of ~20khz - 21khz, you won't notice only a 1khz
> difference. Usually these differences can only be seen on
> state of art equipment because the difference of the specs
> are within the +/- error margins of typical test equipment.
>
> The Hi-Fi audio >tape to head velocity< is 5.8 m/sec (19.03
> fps) in either EP or SP only. It's slower at SP, but can't
> be the same for both speeds, obviously because the
> tape is moving at a different speed (1.3 ips LINEAR tape
> TRAVEL speed in SP vs .4375 ips in EP), but the drum is still
> turning at 1800rpm. Yesterday I mentioned 19 fps, but I
> can't recall if that was for EP or SP...I THINK it was EP,
> but I could be wrong on that. I've looked all over the place
> the past hour and cannot find a simple chart for SP vs EP
> writing speeds! I can't find anything on the subject.
>
> Yes it's as good as CD, that's why I used to record music
> on VHS tapes instead of a cassette deck. Hard getting
> that VCR into the car though....... :-)
> -Clint
>
> Happy Thanksgiving &
> God Bless Us All
> Clint Hamilton, Owner
> http://OrpheusComputing.com
> http://ComputerHardware-ConsumerElectronics.com
> sales@xxxxxxxxxxxxxxxxxxxx
> Fax: 209-882-9602
> TechAssist Administration
> http://tech-assist.org
> techassist@xxxxxxxxxxxxx
>
> ----- Original Message -----
> From: "Dennis Viereck" <wa6ati@xxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, November 26, 2001 2:07 AM
> Subject: [TechAssist] Re: Best way to clean a head.
>
> I did tests when HI-FI first came out. It really made no
> difference at all if
> the tape was recorded in SP or EP for sound quality. Dynamic
> range was greater
> than 80 db and un-weighted wow and flutter was under .008%.
> There was no
> measurable difference between SP or EP. The HI-FI tape to
> head velocity is
> still 5.8 meters per second.
> The only measurable problem I've seen on these machines is
> tangential
> switching noise from time to time. This is caused by a gap
> between the RF
> envelopes between HI-FI head "A" & HIFI head "B". Usually on
> machines that are
> worn.
>
> Don't sell VHS HI-FI short. It is very close to CD quality.
>
> Dennis
>
> Ledstiles@xxxxxxx wrote:
>
> > In a message dated 11/25/2001 11:44:38 AM Pacific Standard
> Time,
> > jeff@xxxxxxxxxxxxxxxxxx writes:
> >
> > <<
> > > there....the hi-fi audio quality is actually better in
> most
> > > cases @ EP (slowest speed) because due to the rotation
> of the
> > > head drum, it is the same direction of the tape path; so
> if
> > > you slow that down to EP, the tape of course then is
> going
> > > slower therefore the 'writing speed' is increased. It
> is
> > > usually not noticeable to ears since the audio specs are
> so
> > > good to begin with, but it does show on paper. Usually
> ab >>
> > I don't buy it. audio quaility is always better in sp speed
> vers ep speed.
> > Larry
> > N.C.S.
>
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