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ARSCLIST  November 2020

ARSCLIST November 2020

Subject:

Isopropyl test

From:

Corey Bailey <[log in to unmask]>

Reply-To:

Association for Recorded Sound Discussion List <[log in to unmask]>

Date:

Fri, 20 Nov 2020 13:35:18 -0800

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (209 lines)

Can you say: "Inverse Square Law"?

Yes, I changed the subject line,

CB

Corey Bailey Audio Engineering
www.baileyzone.net

On 11/19/2020 11:07 PM, Matthew Sohn wrote:
>   It seems pretty simple to me. When you apply a liquid, it has mass, which will disturb tape to head contact. You need to find a way to disperse the "lubricant" evenly in a way that does not push the tape away from the head any more than necessary.I know ISO relieves squealing because I have done it, with Q-tips and an eyedropper and I can tell you that I will charge you a lot to do it again, because it is a pain in the ass, but sometimes it is necessary.Suggestion:Try thoroughly immersing a tape in ISO for 5 minutes.Remove it and let it dryPlay it back
>
>      On Friday, November 20, 2020, 12:25:30 AM EST, Tim Gillett <[log in to unmask]> wrote:
>   
>    Hi all,
>
> Just a followup on my earlier Isopropyl test. It's harder to make the
> test with a cassette tape  as the  tape is more  concealed and
> harder to access. So I made the same test on an open reel tape running
> at 3.75ips on my Revox A700. I put the machine  in a basically
> upright position but leaning slightly forward (to help prevent
> Isopropyl from running into the capstan bearing and washing out its
> lubricant).
>
> I played back a tape recorded with white noise which is rich in high
> frequencies. Using a syringe containing Isopropyl  I carefully
> applied just one drop  to the mag coating just upstream of the repro
> head.  The highs dropped markedly on both channels.  Then as soon as
> the Iso had passed and the surfaces were dry again, normal full treble
> response returned  after a few seconds. I repeated this with a
> succession of single drops and the result was the same each time. I
> guess that with even slower tape speeds the effect would be more
> marked.
>
> Temporarily increasing tape back tension while the tape and head were
> still wet with Iso did seem to recover some of the lost highs but not
> nearly as much as when the Iso had passed through and  normal tape to
> head contact was re established.
>
> I could have gone an extra step and quantified the loss in terms of
> db's down at say 5 kHz or 10 kHz but it seemed hardly necessary as the
> loss was not subtle.
>
> Hope this helps and of course  happy to discuss this further.
>
> Tim Gillett
>
> ----- Original Message -----
> From: "Association for Recorded Sound Discussion List"
> <[log in to unmask]>
> To:<[log in to unmask]>
> Cc:
> Sent:Fri, 13 Nov 2020 14:36:06 +1100
> Subject:Re: [ARSCLIST] Drying Reel-To-Reel Tape in Food Dehydrators?
>
>   Hi Corey,
>
>   I've also used Naks with pressure pad lifters for many years but I
>   guess it makes sense that they cant hope to press a moderately
>   crinkled tape against the head gap as well as  a good pressure pad
>   can. Even in a Tascam 122 Mk II or III the pressure pad doesnt
>   directly press the tape against the repro head gap but presses just a
>   little to the left (upstream) of it.  This also seems to be the
>   reason these model Tascam cassette repro heads tend to have a long
>   life. The pressure pad doesnt have the same opportunity to grind away
>   the repro head's face. But eventually it makes a mess of the record
>   head next to it.  I guess for a less than flat tape probably a more
>   conventional two head cassette deck with the record/play  head
>   centred directly opposite the pressure pad would provide better
>   tape-to-head contact - at the expense of greatly increased head wear
>   of course.
>
>   Hi Marie,
>
>   Like some others here I've only encountered a few cassettes which
>   needed baking.  In my limited experience they were Ampex 20+20,
>   another Ampex cassette type, a Denon LH90 and two unbranded cassettes
>   in white shells. All were helped by baking.   I've also read of
>   BASF LH SM cassettes benefitting from baking.
>
>    A lubricant works by interposing itself between two surfaces
>   scraping against each other, separating the surfaces from each other
>   just a little. The small spacing and the lubrication go hand in hand.
>   I can see that with higher speed tapes such as 7.5 ips or more, a
>   small spacing loss might only affect the highs beyond audibility, but
>   with slow speed tapes, the same spacing must at some point compromise
>   reproduction of the highs.
>
>   I just tried a little experiment. Using tape hiss as an audible
>   reference, after  dropping a little isopropyl onto the mag side of
>   the tape, the tape hiss was reduced considerably, and it only
>   recovered to full output when the lubricant had cleared. I guess
> there
>   has to be a trade off at some point between reducing
>   sticking/squealing, and spacing loss (loss of the highs).
>
>   Cheers
>
>   Tim.
>
>   ----- Original Message -----
>   From: "Association for Recorded Sound Discussion List"
>   <[log in to unmask]>
>   To:<[log in to unmask]>
>   Cc:
>   Sent:Fri, 13 Nov 2020 11:06:20 +1300
>   Subject:Re: [ARSCLIST] Drying Reel-To-Reel Tape in Food Dehydrators?
>
>   Kia ora all
>
>   I have encountered many squealing tapes in the collections I'm
>   working
>   on in the Archive. Be mindful they have been recorded in locations
>   all
>   over the Pacific so the climate, humidity and temperature has played
>   a
>   part.
>
>   I have great success with baking the cassettes and leave in the oven
>   for at least 2 days. If really bad, I will open up the case and drip
>   some isopropyl over the tape. I haven't had any yet that I can't
>   reproduce. They are all different brands and lengths also.
>
>   Hope that helps.
>   Marie
>
>   On Fri, Nov 13, 2020 at 10:23 AM Corey Bailey
>   <[log in to unmask]> wrote:
>   >
>   > I've had a few cassettes that suffered from SSS. Storage seemed to
>   be
>   > the issue. IIRC, in all cases, lubricating the tape proved to be
>   enough
>   > for good playback. I built an audio cassette tape lubricating
>   machine by
>   > hacking a cheap cassette transport.
>   >
>   > Like Lou & others, I generally use Naks for ingest. However,
>   Nakamichi
>   > brand cassette machines seem to prefer the more expensive brands of
>   tape
>   > & their tape tension (Factory spec.) seems low compared to other
>   brands.
>   > For this reason, I have some other cassette machines available for
>   when
>   > my beloved Nak(s) won't play a tape all of the way through. I
>   prefer
>   > dual capstan cassette decks for injest because they tend to have
>   less
>   > azimuth issues. Naks are the only brand, that I know of, that have
>   pad
>   > lifters. Fast-Forwarding & Rewinding the cassette tape before
>   playing
>   > will tell you if the shell works, or not. Plus, the tape gets
>   exercised.
>   > The pressure pad has to be visually inspected.
>   >
>   > Be safe,
>   >
>   > CB
>   >
>   > Corey Bailey Audio Engineering
>   > www.baileyzone.net
>   >
>   > On 11/12/2020 9:55 AM, Lou Judson wrote:
>   > > I’ve never had a cassette with sticky shed. I have seen
>   problems with cheap shells and possibly warping. I use Nakamichis so
>   the pads are not a problem (Naks lift the pad away from the head and
>   use dual capstan tension for better contact).
>   > >
>   > > Have you seen evidence of shedding on the machine after playing?
>   or squeaking as they play? I have had cheap casstes and extra long
>   ones (such as C-100 and C-120) bind and slow down warbling in speed,
>   and usually winding forward and back helps, as well as slapping the
>   casstte flat on a desk to re-align the tape pack.
>   > >
>   > > Re-shelling is not a bad thing either, just have to be careful
>   with all the tiny parts.
>   > >
>   > > Richard Hess might have some deeper wisdom on this, but I have
>   never had a casstte need baking.
>   > >
>   > > <L>
>   > > Lou Judson
>   > > Intuitive Audio
>   > > 415-883-2689
>   > >
>   > >> On Nov 12, 2020, at 9:37 AM, Malcolm <[log in to unmask]> wrote:
>   > >>
>   > >> One of these units has been on my wants list for quite a while
>   along with a Keith Monks record cleaner, but in both cases life has
>   stepped in and said, "No, not yet. I'll get back to you." I have a
>   number of cassettes that display sticky shed but before baking them
>   I'd like to know whether there may be a problem with the shell
>   warping, the pinch pads falling off, etc. Taking the tape pack out of
>   the shell is certainly an option, but I'd rather not if I can help
> it.
>   Suggestions would be helpful. Thanks!
>   > >> Stay safe,
>   > >> Malcolm Rockwell
>   > >>
>   > >> *******
>
>   -------------------------
>   Email sent using Optus Webmail
>
> -------------------------
> Email sent using Optus Webmail

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