[TechAssist] Re: Best way to clean a head.
- From: "Tel-Tek Electronics" <teltek@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 26 Nov 2001 16:44:25 -0500
Interesting..Thanks.
-Ed-
teltek@xxxxxxxxxxx
TEL-TEK ELECTRONICS.
----- Original Message -----
From: "Dennis Viereck" <wa6ati@xxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, November 26, 2001 2:32 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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