HDTenEightyP/NetNews huggingface dataset:
From: peterca@ento.csiro.au
Newsgroups: rec.audio.high-end
Subject: Re: Small Value Film Caps
Date: Fri, 6 Nov 92 10:31:33 EST
Organization: University of Wisconsin - Milwaukee
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Originator: tjk@csd4.csd.uwm.edu

>I am looking for extremely small film capacitors (in the 100-1000 pF range)
>for use in stabilizing feedback loops in power amps.  I don't want to use
>the standard ceramic caps because I have had difficulties in the past with
>small amounts of distortion and microphonics caused by piezoelectric effects.
>Unfortunately, no very small film caps seem to be made, and I don't want to
>string a number in series to reduce the value.  Has anyone out there ever
>seen such creatures for sale?  Polypropylene or polyester would be fine, to
>start out with anyway.
I don't think you can get polypropylene this small but that is because you
can use polystyrene which is what you would use instead of polypropylene if
you could get them that big.  IE polystyrene is readily availlable and as
good as polypropylene and better than polyester.  It has very low
dielectric absorbtion and good stability which are supposed to correlate
well with good sound.  Ideally use an extended foil type which is designed
for superior HF (radio frequency) performence.  The foil is wound in a
cylinder.  If the leads are attached at one point there is some series
inductance.  In an extended foil the lead attatches accross the protruding
edge of the wound foil thereby shorting out the windings of each "plate" of
the capacitor.  

----------------------------------------
Peter Campbell
C/O Div. Entomology, C.S.I.R.O.
Box 1700 Canberra A.C.T. 2601
Australia  (peterca@ento.csiro.au)
Ph.61-6-2464158 (w), 61-6-2516213 (h)
----------------------------------------
From: dionf@ere.umontreal.ca (Francois Dion)
Newsgroups: rec.audio.high-end
Subject: Re: PCM vs DAT?
Date: Fri, 6 Nov 1992 20:44:06 GMT
Organization: Universite de Montreal
  (920330.SGI/IDA-1.4.3 for uunet!rec-audio-high-end); Fri, 6 Nov 92 20:44:11 GMT
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 sethb@fid.Morgan.COM (Seth Breidbart) writes:
> dionf@ere.umontreal.ca (Francois Dion) writes:
>>The rare places i have seen them here, they sell at 20$ CDN (don't remember if
>>it was 120 minutes.
>
>Denon 120-minute dat tapes cost $7.

I'm not sure by your address, but i think you are in USA. I'm in Canada. To
paraphrase The KLF: "It's grim up north".

Seriously, DAT tapes are 19-20$ CDN here.

>>The entry level DAT machine is 899$ in the few stores that have them.
>
>The Sony DTC-670 costs $470.

899$ in Montreal, Canada, on Ste-Catherine street (the grey market street of
Montreal along with St-Laurent)

>> Don't
>>even think about pro DATs.
>
>Sony PCM-2300 for $950.

Not available at discount electronic stores.

>These are all real prices, from different suppliers.

Mine are also real Canadian prices, from discount stores on Ste-Catherine.

Ciao,
--
Francois Dion
    '  _   _   _ 
 CISM (_) (_)  _) FM       Montreal , Canada       Email: CISM@ERE.UMontreal.CA
      (_)  / . _)             10000 Watts          Telephone no: (514) 343-7511
_______________________________________________________________________________
Audio-C-DJ-Fractals-Future-Label-Multimedia-Music-Radio-Rave-Video-VR-Volvo-...
From: haverl@cats.ucsc.edu (Carl A Haverl)
Newsgroups: rec.audio.high-end
Subject: Re: Small Value Film Caps
Date: 6 Nov 1992 18:33:08 GMT
Organization: University of California, Santa Cruz
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Originator: tjk@csd4.csd.uwm.edu


Polyester is another name for mylar.  Mylar capacitors are available
at most electronic supply stores that service industry, i.e. any place
other than Radio Shack.  Most metropolitan areas have such an
electronics distributor.

Carl

-- 
Carl Haverl
haverl@cats.ucsc.edu

305 Chace St.
Santa Cruz, CA 95060
(408) 458-3259
From: Scott Dorsey <kludge@grissom.larc.nasa.gov>
Newsgroups: rec.audio.high-end
Subject: piezo tweeters?
Date: Wed, 4 Nov 92 14:35:06 EST
Organization: University of Wisconsin - Milwaukee
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Originator: tjk@csd4.csd.uwm.edu


Personally, I have found piezo tweeters abhorrent.  The Motorola units are
the best of the bunch, and far and above the quality of any tweeter
(piezo or not) in the under $20 price range.  They can actually be coaxed to
sound good; I have heard a Vandersteen speaker using the things which had
still a slightly harsh high end, but not as brittle as you normally associate
with piezo tweeters.  They are difficult to get a good sound out of, though.
I worked for several months with a set of PA speakers attempting to clean
up the high end and eventually gave up trying to get a flat pattern without
extreme harshness.

For the price, though, they are worth buying to play around with, and if you
can't do anything with them you don't feel so bad about pitching them.  They
will definitely be a good exercise in design, as well.
--scott
From: agwiii@fang.att.com (Grayson Walker (660-7949)(12/92))
Newsgroups: rec.audio.high-end
Subject: Re: Wanted: Information on Ampeg 300 watt tube amps.
Date: Thu, 12 Nov 1992 14:33:50 GMT
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I want to thank all of you for your help.  I was very pleasantly surprised
at the quantity and quality of replys.  The old Ampegs are SVTs and originally
came with equally large speaker cabinets.  The intended use was BASS guitar, 
although some were used for lead guiter.

Certainly not the hifi units that were represented to me by the seller.  Very
interesting units, but not what I need for my system.

Again, thank you to all.

Grayson.
-- 
Grayson Walker                                           CHC, Maitland, Florida 
Forza!                                            Internet: agwiii@fang.att.com
Voice: 407 660 7949               ". . . big brown river . . ." Tuli Kupferberg
From: Bill Luciw <luciw@apple.com>
Newsgroups: rec.audio.high-end
Subject: Acoustat Model 4
Date: Fri, 6 Nov 1992 17:50:58 GMT
Organization: Apple Computer, Inc.
	for
NNTP-Posting-Host: 129.89.7.4
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I've had a pair of Acoustat Model 4s [dipole radiator electrostatics] for
over 10 years.  They still sound pretty good to me [although the low end
is a bit wanting for my tastes].  I was wondering if anybody knows what
ever happened to the company.  Also, I need to recover then with new
grille cloth [cats, ya know!].  Anyone have any hints to help make the
job go smoother?

Thanks.

-- Bill

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Bill Luciw                      Voice: (408) 974-3845
Newton Products Group           Fax:   (408) 974-1794
Apple Computer, Inc.    
10300 Bubb Rd.  MS: 50-B        AppleLink:  Luciw
Cupertino, CA 95014             Internet:   luciw@apple.com

"Imagination is more important than knowledge."
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
From: randy@unix.ecs.rpi.edu (Randall Bradley)
Newsgroups: rec.audio.high-end
Subject: Re: Acoustat Model 4
Date: Thu, 12 Nov 1992 00:49:07 GMT
Organization: Rensselaer Design Research Center, RPI, Troy, NY
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Originator: tjk@csd4.csd.uwm.edu

I've owned a few different Acoustats, still do. They come from
the factory in pretty good sounding condition. BUT...
they suffer from some problems.That's the bad news.

The good news is that the worst of the problems is not too
difficult to fix properly. Since it originates in the "kinetic
interface" (read transformer box). Anyone who is interested in
these mods, and they are not the same ones that are offered or
published elsewhere, let me know.

You may have noticed that the upper mids always seem to come
out in front of the speaker plane, even when everything else is
in the plane. This is a symptom of the problem.

Email via: randy@rpi.rdrc.edu   or phone (518) 756-9894
From: geers@eniac.seas.upenn.edu (GGeers)
Newsgroups: rec.audio.high-end
Subject: Re: Acoustat Model 4
Date: 9 Nov 92 17:11:56 GMT
Organization: U of Penn
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In article <1dlq8cINNjti@uwm.edu>, luciw@apple.com (Bill Luciw) writes:
> 
> I've had a pair of Acoustat Model 4s [dipole radiator electrostatics] for
> over 10 years.  They still sound pretty good to me [although the low end
> is a bit wanting for my tastes].  I was wondering if anybody knows what
> ever happened to the company.  Also, I need to recover then with new
> grille cloth [cats, ya know!].  Anyone have any hints to help make the
> job go smoother?
> 
> Thanks.
> 
> -- Bill


     Acoustat is now owned by Rockford Corp. of AZ.  Call 800-366-2349
and ask for the Acoustat division.  They'll be glad to give you any info
on cloth replacement or whatever.  Upgrades are also available for your
4's.  (I owned Model 3's for about 10 years.)

Regards,
GG
From: redfreak@ecn.purdue.edu (Thomas Lobonc)
Newsgroups: rec.audio.high-end
Subject: Hum Problem
Date: Mon, 9 Nov 92 10:37:04 -0500
Organization: University of Wisconsin - Milwaukee
NNTP-Posting-Host: 129.89.7.4
Originator: tjk@csd4.csd.uwm.edu

I've got a noise problem with my system, and I would like some advice.

Audio Research D-70II amp, Counterpoint SA-1 preamp, Sota/ETII/AQ MC-5,
Spectral MI-550 and AQ ruby connects.

The amp is in one wall outlet, and the preamp, table, cassette deck, VCR,
TV, and a receiver are in another outlet (on another wall) in one of
those cheap 6 outlet jobs that plugs into the two on the wall. I know
that's not a good arrangement, but there's not much I can do about it.

I fixed one noise by putting cheater plugs on the amp and preamp (I must
have had a ground loop?) This eliminated a steady hum/buzz that occurred
whenever the VCR was hooked to any of the line inputs. Interestingly,
there was no problem with the CD player causing noise, and neither have
a 3 prong plug. 

I still have a cross between a buzz and a hum when the phono is selected.
The noise is not the same as the one that was eliminated,is there
regardless of whether the table is connected or not, and is in both channels.  
The noise increases as the volume is increased, but is not audible until
about 1/3 - 1/2 rotation. If the output is muted, (via a switch) there is
no noise.  Adding a ground wire from the table to the preamp increases the
noise. I did not have this noise problem in my previous apartment, or any 
of the others before that, and I have had this system in a lot of places.

I also noticed some bleed through among the line ins and phono that I have
never noticed before.

Can anyboby help?
Thanks,
Tom
From: agwiii@fang.att.com (Grayson Walker (660-7949)(12/92))
Newsgroups: rec.audio.high-end
Subject: Wanted: Information on Ampeg 300 watt tube amps.
Date: Mon, 9 Nov 1992 14:38:09 GMT
Organization: AT&T Tax Systems Development, Maitland FL
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I have just been offered a pair of VERY large and VERY heavy
Ampeg tube amps.  The seller tells me they are 300 watts each 
and 0.10% THD.  Age is unknown, but must be at least 20 or 30 yrs.
Any information or suggestions will be appreciated -- Please send
via e-mail.  Thanks.
-- 
Grayson Walker                                           CHC, Maitland, Florida 
Forza!                                            Internet: agwiii@fang.att.com
Voice: 407 660 7949               ". . . big brown river . . ." Tuli Kupferberg
From: cs6h+@andrew.cmu.edu (Craig Stark)
Newsgroups: rec.audio.high-end
Subject: Re: Small Value Film Caps
Date: 6 Nov 92 13:23:59 GMT
Article-I.D.: uwm.1dlq8dINNjtj
Organization: University of Wisconsin - Milwaukee
NNTP-Posting-Host: 129.89.7.4
Originator: tjk@csd4.csd.uwm.edu

I'm not sure why you're having problems.  If you're trying to find
polyprop. or polyester, forget it, but you have no cause to.  You
should be able to find polystyrene caps from 10pf-5000pf without too
much difficulty.  Nice thing is, polystyrenes have even better DA
properties than polyprops.  Any large distributer like Newark or Arrow
will carry them.  Heck, I can even pick them up at my campus' parts
shop.

Craig
From: agwiii@fang.att.com (Grayson Walker (660-7949)(12/92))
Newsgroups: rec.audio.high-end
Subject: Re: price quote for Mac MR78 tunner
Date: Thu, 5 Nov 1992 15:50:11 GMT
Organization: AT&T Tax Systems Development, Maitland FL
	id <m0mn9TP-000083C@fang.att.com>; Thu, 5 Nov 92 10:50 EST
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IPing Chen writes:
Can anyone out there tell me what the fair price is for an used MR78 tunner?
Any pointer would be very much appreciated. Thanks.

Try Audio Classics 800 321 2834.  They specialize in used McIntosh stuff.
-- 
Grayson Walker                                           CHC, Maitland, Florida 
Forza!                                            Internet: agwiii@fang.att.com
Voice: 407 660 7949               ". . . big brown river . . ." Tuli Kupferberg
From: archer@elysium.esd.sgi.com (Archer Sully)
Newsgroups: rec.audio.high-end
Subject: Re: DAT is King of Audiophile Digital Recording
Date: Fri, 6 Nov 1992 20:20:59 GMT
Organization: Silicon Graphics, Inc.  Mountain View, CA
	(5.61/UUNET-internet-primary) id AB10857; Fri, 6 Nov 92 15:35:12 -0500
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Originator: tjk@csd4.csd.uwm.edu

In <1ddu9eINNl3v@uwm.edu> hafner@ifi.unizh.ch (Michel Hafner) writes:
*
*You must be kidding. If these people listened to a 20th generation analogue
*tape and found the difference to the digital master to be slight, there are
*only a few possibilities:
*
*- they have very bad hearing
*- they used very low playback volumes
*- they used a very unrevealing kind of music 
*- they used very unrevealing playback equipment
*- combinations of the above
*									M.H.

The previous writer was refering to a different test than the one I was
talking about, but I remember that one, too.  Heck I may even be able to
find the issue '-).  The key was that they were going DAT->analog out->DAT
for their generations, eg, attempting to quantify the generational loss 
through professional quality converters.  At no time was an analog deck used.
Otherwise there would be significant problems.  Regardless, its an easy 
experment to duplicate if you've got a couple of DAT machines, some time 
and a few willing victims.

-- archer
From: thk@sgi.com (Tom Kong)
Newsgroups: rec.audio.high-end
Subject: Re: bias
Date: 4 Nov 1992 18:37:40 GMT
Organization: Silicon Graphics Inc., Mountain View, CA
NNTP-Posting-Host: 129.89.7.4
Originator: tjk@csd4.csd.uwm.edu

In article <1d8plaINNpo4@uwm.edu> faulkner@beta.tricity.wsu.edu (Ed Faulkner) writes:
>I have a pair of tube amps which are being rebuilt hopefully for optimum
>performence. They use EL34s in the output stage and are origionally rated
>at 40W. If I rewire the tubes for triode connection and increase bias for
>class A operation can a parallel output stage be inserted into the
>circuit? How can I determin the correct bias for class A operation in the
>output stage and for tubes in general?
>
>Also, are any companies still selling modification kits for the "NEW" AR
>turntable?
>
>Thanks for the help!

Be careful that the output transformer can handle the higher quiescent
current you're giving it.  It will heat up more.

Determining the bias for class A operation is easy.  Figure out the max
output wattage you want, then Ipk * Ipk * Z = 2 * max continuous output,
where Ipk is the peak current through one tube, Z is your transformer's 
plate to B+ impedence (not to be confused with plate-to-plate impedence).

Your bias for each tube should be a tad over Ipk/2.

/tom
From: palane@iastate.edu (Paul A. Lane)
Newsgroups: rec.audio.high-end
Subject: Re: Why digitize: some bunk
Date: Tue, 10 Nov 1992 15:21:15 GMT
Organization: Iowa State University, Ames IA
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In <1dof1cINN85e@uwm.edu> Paul Winser <paul@prl.phil.co.uk> writes:

>For steady-state sine waves, OK. But steady-state sine waves
>(mathematically) carry zero information. Music, on the other hand is by
>definition an information signal and consists of a series of transients
>or events in the time domain. Can you be sure that all non-repetative
>transient audio waveforms can be losslessly represented by 44KHz samples?

Any time-domain variations in the musical signal must take more than 50
microseconds (1/20kHz). Any variations faster than this would be inaudible.
Any variations of more than 50 microsec. can be faithfully represented by
a 40 kHz digital reproduction. 44kHz was used to provide a little breathing
room.

Your thoughts about working in the time domain are interesting, but do not
invalidate NyQuist's Theorem. This is not to say digital is without problems.
From: peterca@ento.csiro.au
Newsgroups: rec.audio.high-end
Subject: Leak stereo 50-circuit diagram request
Date: Mon, 9 Nov 92 11:35:47 EST
Organization: University of Wisconsin - Milwaukee
NNTP-Posting-Host: 129.89.7.4
Originator: tjk@csd4.csd.uwm.edu

Does any one have the circuit diagram for this beastie?  If so could I
please have a copy by either fax or mail.  Thank you in advance.

----------------------------------------
Peter Campbell
C/O Div. Entomology, C.S.I.R.O.
Box 1700 Canberra A.C.T. 2601
Australia  (peterca@ento.csiro.au)
Ph.61-6-2464158 (w), 61-6-2516213 (h)
----------------------------------------
From: ds567664@LANCE.ColoState.Edu (Douglas Satterfield)
Newsgroups: rec.audio.high-end
Subject: Re: ADCOM GFA-555 Long Term Reliability Report; M&K S1B & V1B Speakers
Date: Thu, 05 Nov 1992 00:18:24 GMT
Organization: Colorado State U. Engineering College
NNTP-Posting-Host: 129.89.7.4
Originator: tjk@csd4.csd.uwm.edu

  I am happy to hear you are experiencing sonic bliss, and I agree you
  can get good sound without breaking the bank, but to say Electrostatic 
  speakers lack imaging?  I think not, maybe you have been listening to 
  your blissful system too long. I own a pair of Acoustat model 1100's
  (which have plenty of bass and imaging) as a matter of fact they sound
  so good the speakers actually disappear. There are hybrid designs like the
  Acoustats that combine a cone woofer with the electrostatic panel, which
  incidentally provide bass that you can feel, down to 30hz.
  So maybe you should go out and listen to some other equipment and open
  you mind and ears, if not your wallet.
From: peterca@ento.csiro.au
Newsgroups: rec.audio.high-end
Subject: Re:  System on a budget
Date: Fri, 6 Nov 92 10:16:55 EST
Organization: University of Wisconsin - Milwaukee
NNTP-Posting-Host: 129.89.7.4
Originator: tjk@csd4.csd.uwm.edu


...
>ultimately return to England.  He wants the equipment to be 250 volt >compatible!
>Looking at the back of my Revox A77, it's clearly voltage-switchable; he can
>readily procure an A77 for less than $400.  But beyond this, I'm stumped.  Such
>marvels as the Magnum-Dynalab FT101 tuner, also about $400 used, seem not to be
>switchable.  (At least mine isn't).  Ditto for the Rotel CD players, which would
> Can anyone offer any advice as to what manufacturers tend to make stuff
>that's dual voltage, either via switch, jumper changes, or whatever?
>
Unless its is made exclusively for the American market I would expect many
manufacturers use a transformer with a dual primary wired parallel for
220/240V and in series for 110/120V.  they might save cost by not providing
an externel switch for this but inside the transformer leads go to
different holes on a cicuit board for different markets.  Of course they
might also just install a different transformer for the two markets in
which case you could swap transformers in Britain (at a higher expense- too
much expense for a power amp probably but OK for a tuner etc with a smaller
transformer).  These would be easy changes for any technician if you friend
is not able to do it himself.  The third option is a stepdown transformer
to be purchased when he returns home.  Big ones for the power amp will be
expensive but OK for the smaller components.  
A fourth option is to buy second hand and sell again losing only a little
and thereby "renting" a good system for very little.  

----------------------------------------
Peter Campbell
C/O Div. Entomology, C.S.I.R.O.
Box 1700 Canberra A.C.T. 2601
Australia  (peterca@ento.csiro.au)
Ph.61-6-2464158 (w), 61-6-2516213 (h)
----------------------------------------
From: p0p4018@zeus.tamu.edu (PREMTHAMKORN, PRAKIT)
Newsgroups: rec.audio.high-end
Subject: Help: Large Heatsinks Suppliers Sought
Date: 5 Nov 1992 12:37:59 -0600
Organization: Texas A&M University, Academic Computing Services
NNTP-Posting-Host: 129.89.7.4
Originator: tjk@csd4.csd.uwm.edu

I am collecting parts to build a power amplifier.  I am having difficulty
finding large heatsinks for the output transistors (TO-3 MOSFET).  Preferably,
they should rate 2-3 C/Watt or larger.  Any help to locate suppliers would be
greatly appreciated.  Thanks you.

Prakit
From: MWW%TNTECH.bitnet@CUNYVM.CUNY.EDU (Michael W. Wheeler)
Newsgroups: rec.audio.high-end
Subject: Ordering CDs via Internet
Date: 6 Nov 92 07:34:32 GMT
Article-I.D.: uwm.1dlq88INNjte
Organization: University of Wisconsin - Milwaukee
   with BSMTP id 6305; Fri, 06 Nov 92 14:34:09 EST
 <01GQTZUDFDTCBB1NOT@TNTECH.BITNET>; Fri, 6 Nov 1992 13:34:32 CST
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Originator: tjk@csd4.csd.uwm.edu

I called a CD warehouse (can't remember the name off the top of my head)
via modem. They had this great database where you could search by artist,
title, or some other criteria. I found what I was looking for (something
that has been out of print for a while) and I ordered it.

After placing the order it asked me where I learned of the service and one
of the places it mentioned was the Internet. They didn't say anything about
whether they were reachable via the internet or not. So... does anyone know
if there is such a critter on the Internet and if so what the address is?
It would sure save on the long distance phone charges that I probably
racked up.

Michael W. Wheeler (Bitnet: mww@tntech) (Internet: mww@tntech.edu)
From: b-grant@nwu.edu (Barry Grant)
Newsgroups: rec.audio.high-end
Subject: speaker clamps
Followup-To: rec.audio.high-end
Date: Wed, 11 Nov 1992 19:16:30 GMT
Organization: Northwestern University
NNTP-Posting-Host: 129.89.7.4
Originator: tjk@csd4.csd.uwm.edu

Has anyone heard the Roomtunes speaker clamps or tried them on their
speakers? I use their corner tunes, echotunes, roomtunes, and clamprack,
but before going to the trouble of getting the speaker clamps shipped home
for a trial, I'd like to hear of other peoples' experiences with them. The
other Roomtunes products I have work as their literature says they do. The
corner tunes are indispensible and relatively cheap. The other "tune"
products work, but not as powerfully as the corner tunes. The ampclamp has
the least pronounced effect, but still works, and is a reasonably priced
equipment rack.


Barry Grant
Northwestern Univesity
Evanston, Illinois
b-grant@nwu.edu