[TechAssist] Re: Best way to clean a head.
- From: Dennis Viereck <wa6ati@xxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 27 Nov 2001 19:58:26 -0800
Your right meters not feet....
dv
"OrpheusComputing.com Repair" wrote:
> Think you meant 240m, right? T120 tape has 246m (over 800')
> of tape. :-)
> -Clint
>
> 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 1:32 PM
> Subject: [TechAssist] Re: Best way to clean a head.
>
> Ed:
> Yes. As tape speed increases the better frequency response
> will be the ultimate
> result. This will increase the number of octaves that can be
> placed on the
> tape. On a standard reel to reel tape machine 15 ips would
> achieve an
> outstanding frequency response. But you sacrifice the amount
> of time you have
> by the physical limitations of the tape length. I think a
> standard T120 tape we
> only have 240 feet of tape. By helically writing on the tape
> rather than a
> linear track we can take advantage of the short tape length
> and place it
> diagonally on the tape. This way we can increase the head to
> tape writing
> speed.
>
> At over 19 feet per second we have so much bandwidth we can
> record an FM R.F.
> spectrum. In the case of HI-FI, I believe it is 1.3 mhz for
> L-R and 1.7 mhz for
> L+R.
>
> Dennis Viereck
>
> Tel-Tek Electronics wrote:
>
> > Dennis;
> > Would speed of VHS tape not effect the audio the same way
> that the old
> > Reel-to-reel recorders worked. Use to replace the spindle
> size to increase
> > the tape speed. More tape per inch, better frequency
> response?
> > Although I agree that audio to the average person will not
> improve with one
> > speed over another, since the audio is pretty good at any
> speed.
> >
> > -Ed-
> > teltek@xxxxxxxxxxx
> > TEL-TEK ELECTRONICS.
> >
> > ----- Original Message -----
> > From: "Dennis Viereck" <wa6ati@xxxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Monday, November 26, 2001 10:09 AM
> > Subject: [TechAssist] Re: Best way to clean a head.
> >
> > >
> > > 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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