Subject: Re: M60 latest mods
Date: Mon, 10 Aug 1998 17:41:19 -0700
From: Atma-Sphere@ManicReader.com
Organization: SMTEK
To: Atma-Sphere@ManicReader.com
On 1998/08/10 at 17:41:18, WB6RHQ@SMTP {wb6rhq@loop.com} wrote:
Hello John,
> Maybe, but I don't think it had fused through over-current. It looked
> as though the weld to the base of the cathode had failed. One of
> the tubes subsequently got broken while it was on the bench (something
> fell on it - glad it wasn't one of my VV30Bs!) so I will take it apart
> and have a closer look.
I'd be curious to learn about the results of your investigations. In my case,
I've inspected 6As7Gs that have arced over. The wire attachinf the cathode to
the thicker wire going to the tube's socket is literally exploded. No doubt, so
real current happened here. That's a catistrophic failure that sounds different
that what you've experienced.
> These tubes can handle plenty of current! After I did the mod to the
> first chassis, I noticed one plate glowing red. I measured 750mA!
> Then I discovered that the cathode connection had never been soldered.
> The problem went away when I soldered the wire (it must have been
> touching all that time) -- don't ask me how a tube with an o/c cathode
> can pull 750mA! However the point is that the tube was fine
> aftewards -- I took it out but was forced to use it again when
> I found the two faulty tubes.
Mysteries are the spice of life. I've had plates glow red on my bench in a test
jig and the tube still survives. I'm not sure I trust the tube anymore, but it's
amazing the abuse they will tolerate. Thermal runaway is another issue, however.
> >You might consider another related modification. I have installed a pair of
> >tip jacks next to each output tube. Each tip jack is connected to an output
> >tube plate (I used red jacks). I also installed two more tip jacks (I used
> >black), each connected to their respective sides of the two bipolar output
> >supplies. Now I can meter plate current, on all the output triodes, without
> >the need to tip the amplifier up on its side.
>
> Interesting idea but I couldn't face doing the metalwork!
So what's a few holes among friends? If you're suggesting I spend too much time
with these amplifiers, you probably right!
> I knew about this one but haven't done it. I don't think I would now,
> as I can't see how it could be fitted in with the plate resistors in place.
I'm sorry to hear you've run out of space. The improvemsnt is well worth the
effort in my opinion.
Best regards,
mark gilmore
Subject: Re: M60 latest mods
Date: Tue, 11 Aug 1998 8:07:13 -0700
From: Atma-Sphere@ManicReader.com
Organization: SMTEK
To: Atma-Sphere@ManicReader.com
On 1998/08/11 at 08:07:08, B.LAYER@SMTP {b.layer@vikingelectronics.com} wrote:
Hi Ben,
At 05:38 PM 8/10/98 -0700, you wrote:
>On 1998/08/10 at 17:38:19, BBB@SMTP {bbb@castle.net} wrote:
>
>Well, I doubt the value (3-10uF) for the snub caps. I remember it shoud be in
>the range of 0.001 to 0.22 range. If a serial resistor (from 15-300Ohm) is
>used, the value should be even smaller.
I think I may have been misunderstood. In a snubber application, the values
you have suggested are quite correct, as well as the inclusion of a series
resistor to establish a timing constant.
My suggestion pertains to power factor, which is a slightly different
issue. R-C Snubbers generally work to kill noise on the power line, or in
the rectifier of a DC supply. Power factor correction, on the other hand,
attempts to correct harmonic/enharmonic distortion of the actual AC power
waveform itself.
In practice, this is seen in the form of the large banks of capacitors
often present in industrial equipment installations, where on-site power
factor correction is mandated by the local utility. For more on this, see
the excellent article by Marty DeWulff in BFS.
The issues of noise and power factor are of course, related...
The cap values I suggest are appropriate for the first round of a
trial-and-error process. Be sure to use nonpolar 'bathtub style' cap with
an AC voltage rating of at least 300.>
Bill Layer
Sales Technician
----------------------------------
Viking Electronics, Inc.
Hudson, WI. U.S.A
715.386.8861 (ext. 210)
----------------------------------
"Telecommunications Solutions for the 21st Century"
Subject: Re: M60 latest mods
Date: Tue, 11 Aug 1998 20:27:14 -0700
From: Atma-Sphere@ManicReader.com
Organization: SMTEK
To: Atma-Sphere@ManicReader.com
On 1998/08/11 at 20:27:13, BBB@SMTP {bbb@castle.net} wrote:
Atma-Sphere@ManicReader.com wrote:
> On 1998/08/11 at 08:07:08, B.LAYER@SMTP {b.layer@vikingelectronics.com} wrote:
>
> Hi Ben,
>
> At 05:38 PM 8/10/98 -0700, you wrote:
> >On 1998/08/10 at 17:38:19, BBB@SMTP {bbb@castle.net} wrote:
> >
> >Well, I doubt the value (3-10uF) for the snub caps. I remember it shoud be in
> >the range of 0.001 to 0.22 range. If a serial resistor (from 15-300Ohm) is
> >used, the value should be even smaller.
>
> I think I may have been misunderstood. In a snubber application, the values
> you have suggested are quite correct, as well as the inclusion of a series
> resistor to establish a timing constant.
>
> My suggestion pertains to power factor, which is a slightly different
> issue. R-C Snubbers generally work to kill noise on the power line, or in
> the rectifier of a DC supply. Power factor correction, on the other hand,
> attempts to correct harmonic/enharmonic distortion of the actual AC power
> waveform itself.
>
> In practice, this is seen in the form of the large banks of capacitors
> often present in industrial equipment installations, where on-site power
> factor correction is mandated by the local utility. For more on this, see
> the excellent article by Marty DeWulff in BFS.
>
> The issues of noise and power factor are of course, related...
>
> The cap values I suggest are appropriate for the first round of a
> trial-and-error process. Be sure to use nonpolar 'bathtub style' cap with
> an AC voltage rating of at least 300.>
>
Hi Layer,I think your trick worth a try.
I am new here, and have a few question to ask OTL pals.
Do you know where I can have a peak of the new MA-1's schematics? Mine is the
original one, and I know the driver stage is not well designed ( the main problem
is the plate voltage is too low and the bias of the hedge circuit does not have
enough current as Mr. Wallman sugguested).
I did some adjustment of the bias, but it is just t oo much to raise the plate
voltage. I wonder if the new MA-1 has higher plate voltage for the driver stage
and more current for the cascode. Another puzzle I have on orignal MA-1 is the 1K
resistor cross the two floating power supplies. I can not figure out why.
Thanks.
Ben Yang
> Bill Layer
> Sales Technician
>
>
> ----------------------------------
> Viking Electronics, Inc.
> Hudson, WI. U.S.A
> 715.386.8861 (ext. 210)
>
> ----------------------------------
>
> "Telecommunications Solutions for the 21st Century"
Subject: Re: M60 latest mods
Date: Wed, 12 Aug 1998 7:01:01 -0700
From: Atma-Sphere@ManicReader.com
Organization: SMTEK
To: Atma-Sphere@ManicReader.com
On 1998/08/12 at 07:01:01, B.LAYER@SMTP {b.layer@vikingelectronics.com} wrote:
Hi Ben,
>Do you know where I can have a peak of the new MA-1's schematics? Mine is
the
>original one, and I know the driver stage is not well designed ( the main
problem
>is the plate voltage is too low
That doesn't sound right. What are the (+/-) supply voltages in your
driver? They should be about +/-325VDC. I have heard rumors that the
factory was considering increasing this, but I'm unaware of any actual
changes. In any case, I've never encountered an older MA-1 that could not
support the best implementaion of the Mk.II circuit.
and the bias of the hedge circuit does not have
>enough current as Mr. Wallman sugguested).
I'm not sure what you mean by 'hedge' circuit. Could you rephrase the
question?
>I did some adjustment of the bias, but it is just t oo much to raise the
plate
>voltage. I wonder if the new MA-1 has higher plate voltage for the driver
stage
>and more current for the cascode.
What are the component values in the cascode? This will tell us something.
Another puzzle I have on orignal MA-1 is the 1K
>resistor cross the two floating power supplies. I can not figure out why.
>
He he... You know that mysterious patent number on the back of the unit?
I'll give you one guess...
Good questions, Ben. Lets keep the talk going; this list has been too quiet.
Bill Layer
Sales Technician
----------------------------------
Viking Electronics, Inc.
Hudson, WI. U.S.A
715.386.8861 (ext. 210)
----------------------------------
"Telecommunications Solutions for the 21st Century"
Subject: Re: M60 latest mods
Date: Wed, 12 Aug 1998 18:52:11 -0700
From: Atma-Sphere@ManicReader.com
Organization: SMTEK
To: Atma-Sphere@ManicReader.com
On 1998/08/12 at 18:52:10, BBB@SMTP {bbb@castle.net} wrote:
Hi Bill:
Atma-Sphere@ManicReader.com wrote:
> On 1998/08/12 at 07:01:01, B.LAYER@SMTP {b.layer@vikingelectronics.com} wrote:
>
> Hi Ben,
>
> >Do you know where I can have a peak of the new MA-1's schematics? Mine is
> the
> >original one, and I know the driver stage is not well designed ( the main
> problem
> >is the plate voltage is too low
>
> That doesn't sound right. What are the (+/-) supply voltages in your
> driver? They should be about +/-325VDC. I have heard rumors that the
> factory was considering increasing this, but I'm unaware of any actual
> changes. In any case, I've never encountered an older MA-1 that could not
> support the best implementaion of the Mk.II circuit.
>
-325 V is just a long tail for the differential, does not help head room at
all.325V for cascode driver stage ... it is good for pre-amp, but to drive OTL
output...Anyway, how does the Mk.II circuit differ from Mk.I?
> and the bias of the hedge circuit does not have
> >enough current as Mr. Wallman sugguested).
>
> I'm not sure what you mean by 'hedge' circuit. Could you rephrase the
> question?
Well, Wallman first mentioned the cascodes in his book. cascodes in a differentail
setting is so called "Hedge" circuitry. Since the grid of upper tubes may draw
current, it is desirable to feed higher current through it. To optimized the bias
point of the lower tube, higher plate voltage also is required. that is why 325V
is subject to distorsion for those 150V of ppv 30 Hz output waveforms.
>
>
> >I did some adjustment of the bias, but it is just t oo much to raise the
> plate
> >voltage. I wonder if the new MA-1 has higher plate voltage for the driver
> stage
> >and more current for the cascode.
>
> What are the component values in the cascode? This will tell us something.
the original bias point is around 30 volts. and and the current each leg is bellow
1mA.
>
>
> Another puzzle I have on orignal MA-1 is the 1K
> >resistor cross the two floating power supplies. I can not figure out why.
> >
> He he... You know that mysterious patent number on the back of the unit?
> I'll give you one guess...
>
> Good questions, Ben. Lets keep the talk going; this list has been too quiet.
>
> Bill Layer
> Sales Technician
>
>
> ----------------------------------
> Viking Electronics, Inc.
> Hudson, WI. U.S.A
> 715.386.8861 (ext. 210)
>
> ----------------------------------
>
> "Telecommunications Solutions for the 21st Century"
Subject: Input stage (was M60 latest mods)
Date: Thu, 13 Aug 1998 3:02:51 -0700
From: Atma-Sphere@ManicReader.com
Organization: SMTEK
To: Atma-Sphere@ManicReader.com
On 1998/08/13 at 03:02:50, HARPER@SMTP {harper@q3-consulting.com} wrote:
I've wondered about the cascode input stage quite a bit
myself. On the M60, it has about 320V of headroom for the
cascode. To fit within this the current is about 1mA in
each phase. This is way below the capability of the 6SN7
and into the region where cut-off behaviour is significant.
I have spiced the circuit with 600V and about 4mA per
phase, which looks feasible. My long-ish term plan is to
upgrade to this, but it means having the transformers built.
I wrote a long post a while back about options to upgrade
the input stage. I am not happy about these SN's running
at 1mA.
John
======================================================================
John Harper Specialising in the application of
Q3 Consulting Information Technology to
BP32, 06560 VALBONNE, France Telecommunications
phone: (+33) 493 12 24 70
fax: (+33) 493 12 09 89 E-mail: harper@q3-consulting.com
Subject: Re: Input stage (was M60 latest mods)
Date: Thu, 13 Aug 1998 8:01:37 -0700
From: Atma-Sphere@ManicReader.com
Organization: SMTEK
To: Atma-Sphere@ManicReader.com
On 1998/08/13 at 08:01:36, B.LAYER@SMTP {b.layer@vikingelectronics.com} wrote:
Hi John,
At 03:02 AM 8/13/98 -0700, you wrote:
>On 1998/08/13 at 03:02:50, HARPER@SMTP {harper@q3-consulting.com} wrote:
>
>I've wondered about the cascode input stage quite a bit
>myself. On the M60, it has about 320V of headroom for the
>cascode. To fit within this the current is about 1mA in
>each phase. This is way below the capability of the 6SN7
>and into the region where cut-off behaviour is significant.
>
>I have spiced the circuit with 600V and about 4mA per
>phase, which looks feasible. My long-ish term plan is to
>upgrade to this, but it means having the transformers built.
>I wrote a long post a while back about options to upgrade
>the input stage. I am not happy about these SN's running
>at 1mA.
Did you actually measure 1ma per leg of the cascode? My recollection is
that the figure is closer to 1.5ma. Seems like splitting hairs, but it does
represent a 50% deviation. What are the open circuit voltages in that
driver (ok, not true open-circuit, but at least measured with driver tubes
out)? Should be an honest 350VDC, perhaps more, with a 125VAC line.
Bill Layer
"Quantity has a Quality all of it's own." -JL
Subject: New ASMS site
Date: Sat, 15 Aug 1998 8:15:52 -0700
From: Atma-Sphere@ManicReader.com
Organization: SMTEK
To: Atma-Sphere@ManicReader.com
On 1998/08/15 at 08:15:51, BLAYER@SMTP {blayer@uswest.net} wrote:
Hi All,
Please check out and relay your
comments.
Hopefully my personal experience and unique perspective will prevent
this site from becoming redundant to the ASOG site, but your comments
are appreciated.
Thanks,
Subject: Re: Input stage (was M60 latest mods)
Date: Sun, 16 Aug 1998 18:21:32 -0700
From: Atma-Sphere@ManicReader.com
Organization: SMTEK
To: Atma-Sphere@ManicReader.com
On 1998/08/16 at 18:21:31, BBB@SMTP {bbb@castle.net} wrote:
Atma-Sphere@ManicReader.com wrote:
> On 1998/08/13 at 03:02:50, HARPER@SMTP {harper@q3-consulting.com} wrote:
>
> I've wondered about the cascode input stage quite a bit
> myself. On the M60, it has about 320V of headroom for the
> cascode. To fit within this the current is about 1mA in
> each phase. This is way below the capability of the 6SN7
> and into the region where cut-off behaviour is significant.
>
> I have spiced the circuit with 600V and about 4mA per
> phase, which looks feasible.
After raised bias to 5mA per leg and fixed the upper grid to 75V, all the
"floating" signature of MA-1 was replaced by a sound so much cleaner and
fresher. But without raise the plate voltage, the amp is subjecting to
cutoff distortion.
ben yang
> My long-ish term plan is to
> upgrade to this, but it means having the transformers built.
> I wrote a long post a while back about options to upgrade
> the input stage. I am not happy about these SN's running
> at 1mA.
>
> John
> ======================================================================
> John Harper Specialising in the application of
> Q3 Consulting Information Technology to
> BP32, 06560 VALBONNE, France Telecommunications
> phone: (+33) 493 12 24 70
> fax: (+33) 493 12 09 89 E-mail: harper@q3-consulting.com
Subject: New ASOG Member
Date: Tue, 25 Aug 1998 8:50:04 -0700
From: Atma-Sphere@ManicReader.com
Organization: SMTEK
To: Atma-Sphere@ManicReader.com
On 1998/08/25 at 08:50:03, MARK.GIL@SMTP {mark.gilmore@smtek.com} wrote:
Dear ASOG Listserver Members,
Please join me in welcoming Bob McCarthy to the ASOG Listserver. Bob lives
in Dallas, TX and his email address is jokker@motorsims.com.
Bob is in serious upgrade mode. Welcome aboard, Bob!
Best regards,
mark gilmore
>Old System
>Counterpoint preamp 5.1
>Counterpoint Mono Amps
>Oracle Table with Wheaton Triplaner
>Virtuoso Boron
>Vandersteen 2C's (tweaked) with 2 Vandersteen Sub's
>etc....
>
>New System (on order)
>
>Theda David Digital Transport
>Theda Casablanca (Loaded)
>Atma-sphere MA-1 mk II
>Vandersteen 5's
>Oracle Table etc as above
>Preamp ??????
>etc...
>
>Also a small theater with
>McCormack .5 Deluxe and HT1
>Lexicon
>Pioneer Elite DV09
>McCormack TL-1
>Vandersteen Speakers, Sub's, center, and surrounds
Subject: Preamp needed??
Date: Tue, 25 Aug 1998 9:42:54 -0700
From: Atma-Sphere@ManicReader.com
Organization: SMTEK
To: Atma-Sphere@ManicReader.com
On 1998/08/25 at 09:42:51, JOKKER@SMTP {jokker@motorsims.com} wrote:
Just wanted to say hello.
As Mark indicated, I'm in the process of updating my whole audio system. While I'm not abandoning analog source just yet, I see it coming. I just added a Pioneer Elite DVD player to my theater system and I was greatly pleased with the promise of the new digital formats. 96/24 is real. I've been grinding on a decision that perhaps someone here can help me with. I have been planning to use the Casablanca as a preamp. Digital input will be all in the David/Casablanca. I've wondered how a great tube amp like the Atma-sphere would interface with a solid state device like the Casablanca? I'm obviously going to try , but would appreciate any advise from the group. As for analog, are there any phono stages with enough gain for the occasionally vinyl session?
Or is a preamp necessary?
Thanks for inviting me aboard.
Bob McCarthy
----------------[ Uuencoded File Attachment: NONAME01.HTML ]----------------
Just wanted to say hello.
As Mark indicated, I'm in the process of updating my whole audio system.
While I'm not abandoning analog source just yet, I see it coming. I just
added a Pioneer Elite DVD player to my theater system and I was greatly
pleased with the promise of the new digital formats. 96/24 is real. I've
been grinding on a decision that perhaps someone here can help me with. I
have been planning to use the Casablanca as a preamp. Digital input will be
all in the David/Casablanca. I've wondered how a great tube amp like the
Atma-sphere would interface with a solid state device like the Casablanca?
I'm obviously going to try , but would appreciate any advise from the group.
As for analog, are there any phono stages with enough gain for the
occasionally vinyl session?
Or is a preamp necessary?
Thanks for inviting me aboard.
Bob McCarthy
Subject: Re: Preamp needed??
Date: Tue, 25 Aug 1998 10:58:35 -0700
From: Atma-Sphere@ManicReader.com
Organization: SMTEK
To: Atma-Sphere@ManicReader.com
On 1998/08/25 at 10:58:34, MICHELSO@SMTP {michelson82@hotmail.com} wrote:
Hi Bob:
If you want a good phono stage with gain, try the
EAR ( Esoteric Audio Research by T. de Paravicini).
Itīs a very good tube device , very cheap .
There is a review of it in Stereophile.
Victor Micheslon
>From atma-sphere@manicreader.com Tue Aug 25 09:51:36 1998
>Received: from Connect2 Message Router by smtp.smtek.com
> via Connect2-SMTP 4.33; Tue, 25 Aug 1998 09:43:03 -0700
>Message-ID:
>Date: Tue, 25 Aug 1998 9:42:54 -0700
>From: Atma-Sphere@ManicReader.com
>Sender: Atma-Sphere@ManicReader.com
>Organization: SMTEK
>To: Atma-Sphere@ManicReader.com
>Subject: Preamp needed??
>X-SMF-Hop-Count: 1
>X-Mailer: Connect2-SMTP 4.33 MHS/SMF to SMTP Gateway
>
>On 1998/08/25 at 09:42:51, JOKKER@SMTP {jokker@motorsims.com} wrote:
>
>Just wanted to say hello.
>
>As Mark indicated, I'm in the process of updating my whole audio
system. While I'm not abandoning analog source just yet, I see it
coming. I just added a Pioneer Elite DVD player to my theater system and
I was greatly pleased with the promise of the new digital formats. 96/24
is real. I've been grinding on a decision that perhaps someone here can
help me with. I have been planning to use the Casablanca as a preamp.
Digital input will be all in the David/Casablanca. I've wondered how a
great tube amp like the Atma-sphere would interface with a solid state
device like the Casablanca? I'm obviously going to try , but would
appreciate any advise from the group. As for analog, are there any phono
stages with enough gain for the occasionally vinyl session?
>
>Or is a preamp necessary?
>
>Thanks for inviting me aboard.
>
>Bob McCarthy
>
>
>
>----------------[ Uuencoded File Attachment: NONAME01.HTML
]----------------
>begin 644 NONAME01.HTML
>M/"%$3T-465!%($A434P@4%5"3$E#("(M+R]7,T,O+T141"!7,R!(5$U,+R]%
>M3B(^#0H\2%1-3#X-"CQ(14%$/@T*#0H\345402!C;VYT96YT/71E>'0O:'1M
>M;#MC:&%RM#0H\345402!C;VYT96YT/2M14Y%4D%43U(^#0H\+TA%040^#0H\0D]$62!B9T-O;&]R/2-F9F9F9F8^#0H\
>M1$E6/CQ&3TY4(&-O;&]R/2,P,#`P,#`@M('-A>2!H96QL;RX\+T9/3E0^/"]$258^#0H\1$E6/CQ&3TY4(&-O;&]R/2,P
>M,#`P,#`@M8V]L;W(](S`P,#`P,"!S:7IE/3(^07,@36%R:R!I;F1I8V%T960L($DG;2!I
>M;B!T:&4@<')O8V5SMM:G5S="!Y970L(`T*22!S964@:70@8V]M:6YG+B!)(&IUM:6]N965R($5L:71E($161"!P;&%Y97(@=&\@;7D@=&AE871E7-T96T@
>M#0IA;F0@22!W87,@9W)E871L>2!P;&5AM;V8@=&AE(&YE=R!D:6=I=&%L(&9OM22=V92!B965N(&=R:6YD:6YG(&]N(&$@9&5C:7-I;VX@=&AA="!P97)H87!S
>M('-O;65O;F4@:&5R92!C86X@:&5L<"!M92`-"G=I=&@N($D@:&%V92!B965N
>M('!L86YN:6YG('1O('5S92!T:&4@0V%S86)L86YC82!AM1&EG:71A;"!I;G!U="!W:6QL(`T*8F4@86QL(&EN('1H92!$879I9"]#87-A
>M8FQA;F-A+B!))W9E('=O;F1EM:V4@=&AE(`T*071M82US<&AEM;VQI9"!S=&%T92!D979I8V4@;&EK92!T:&4@0V%S86)L86YC83\@22=M(`T*
>M;V)V:6]U2`L(&)U="!W;W5L9"!A<'!R96-I871E
>M(&%N>2!A9'9IM87)E('1H97)E(&%N>2!P:&]N;R!S=&%G97,@=VET:"!E;F]U9V@@9V%I;B!F
>M;W(@=&AE(&]C8V%S:6]N86QL>2!V:6YY;"`-"G-EM1$E6/@T*/$1)5CX\1D].5"!C;VQOF4],CXF;F)S<#L\
>M+T9/3E0^/"]$258^#0H\1$E6/CQ&3TY4(&-O;&]R/2,P,#`P,#`@M/CPO1D].5#X\1D].5"!S:7IE/3(^3W(@:7,@82!PMM8G-P.SPO1$E6/@T*/$1)5CX\1D].5"!S:7IE/3(^5&AA;FMS(&9OM=&EN9R!M92!A8F]AM/3(^/"]&3TY4/B9N8G-P.SPO1$E6/@T*/$1)5CX\1D].5"!S:7IE/3(^0F]B
>M($UC0V%R=&AY/"]&3TY4/CPO1$E6/@T*/$1)5CXF;F)S<#L\+T1)5CX-"CQ$
>M258^/$9/3E0@8V]L;W(](S`P,#`P,"!S:7IE/3(^/"]&3TY4/B9N8G-P.SPO
>41$E6/CPO0D]$63X\+TA434P^#0I(
>`
>end
>
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com
Subject: Re: Preamp needed??
Date: Tue, 25 Aug 1998 11:02:42 -0700
From: Atma-Sphere@ManicReader.com
Organization: SMTEK
To: Atma-Sphere@ManicReader.com
On 1998/08/25 at 11:02:42, B.LAYER@SMTP {b.layer@vikingelectronics.com} wrote:
Hi Bob,
96/24 is real.
I'll believe that when I hear it! (Pretty cynical about digital sources here)
I've been grinding on a decision that perhaps someone here can help me
with. I have been planning to use the Casablanca as a preamp. Digital input
will be all in the David/Casablanca. I've wondered how a great tube amp
like the Atma-sphere would interface with a solid state device like the
Casablanca?
Well, no sweat from the MA-1's perspective (assuming that you have
sufficent signal level, about 2V RMS for full output for the MA-1 Mk.II),
but will your Casablanca (Which to me is a ceiling fan, I've not heard of
the model) control your cables sufficiently?
Remember: Signals do not control cables; only electronics control cables.
(Oversimplified)
>Or is a preamp necessary?
For control purposes, it can be very helpful. I'd recommend the Atma-Sphere
MP-1.
Bill Layer
Sales Technician
----------------------------------
Viking Electronics, Inc.
Hudson, WI. U.S.A
715.386.8861 (ext. 210)
----------------------------------
"Telecommunications Solutions for the 21st Century"
Subject: Re: Preamp needed??
Date: Tue, 25 Aug 1998 13:00:11 -0700
From: Atma-Sphere@ManicReader.com
Organization: SMTEK
To: Atma-Sphere@ManicReader.com
On 1998/08/25 at 13:00:10, JOKKER@SMTP {jokker@motorsims.com} wrote:
I've not auditioned the "ear" but remember seeing it at John Fort Audio here
in Dallas. I'll check it out. Thanks.
Bob
-----Original Message-----
From: Atma-Sphere@ManicReader.com
To: Atma-Sphere@ManicReader.com
Date: Tuesday, August 25, 1998 12:58 PM
Subject: Re: Preamp needed??
>On 1998/08/25 at 10:58:34, MICHELSO@SMTP {michelson82@hotmail.com} wrote:
>
>Hi Bob:
> If you want a good phono stage with gain, try the
>EAR ( Esoteric Audio Research by T. de Paravicini).
> Itīs a very good tube device , very cheap .
> There is a review of it in Stereophile.