audio research mcp 33

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• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES. Building, troubleshooting and testing of these amplifiers should only be performed by someone who is thoroughly familiar with the safety precautions around high voltages.
• Tubes / Valves
• Audio Research MCP 33
• Thread starter reinhard
• Start date 2003-02-02 9:45 am

HollowState

• 2013-06-09 10:32 pm

Brian Beck said: As a more general comment, the turn-on and turn-off behavior of active circuits, tubes and solid-state, is often overlooked, even by seasoned manufacturers. Click to expand...

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• 2014-10-21 6:28 pm

I did buy an MCP-33 a few months back. Despite my concerns about pulses going back through the inputs at power-on, I had always respected Bill Johnson's patented grounded-grid design and I was curious about it. So when I came across a nice MCP-33 (they are quite rare, nice or otherwise), just back from a freshening-up at ARC, I had to buy it. But before hooking it up to my pricey Dynavector XV-1S cart, I first connected both inputs to an oscilloscope and cycled power. Nada. Nothing visible on the 5mV/div scale anyway. I guess the big input caps charge up so slowly through tubes that are warming up that there isn't much of a pulse coming out into the cartridge, simulated for this test by 10-ohm resistors. As to sound, I haven't really decided yet. I'm using the low-noise-selected NOS Philips ECG JAN 6922 (USA) tubes that ARC put into it. They are now out-of-stock on these tubes, BTW. I connected the '33 to an ARC SP-10 ("Mk II", Rev "7" or "C") phono stage (set to 47K input R) and took the phono stage's output before the SP-10's line stage, and then into an Abbingdon AMR DP-77 tube DAC as a line stage instead. I then compared this configuration to using the SP-10 alone, but this time using the SP-10's line stage, because I needed the additional gain. I also compared it to using an Entre ET-200 step-up transformer into the SP-10's phono stage. I haven't had a lot of time to seriously compare all three options, but my first impression is that the SP-10 alone is the most transparent configuration. The SP-10 was designed to directly connect to moving-coil cartridges, and it was not intended to be used with any step-up device at all, so this use of the '33 is not optimal. There was no overload, though. The '33 would be a better match with a phono stage intended for moving-magnet cartridges. In all three cases, BTW, noise never intruded into my musical enjoyment.  

diyAudio Senior Member

• 2014-10-24 8:55 pm
• 2014-10-24 10:55 pm

fdegrove said: Hi, Do you recall the MC headamp I posted many years ago? Click to expand...

fdegrove said: While the SP10 can cope with healthy output MCs it won't take the lowish output ones without audible hiss. Click to expand...

• 2014-10-25 11:53 am

Ex-Moderator

• 2014-10-25 12:19 pm

Brian is not going to like that CCS! I even call the optional resistors between the CCS and plate of my preamp designs "The Brian Beck Memorial Resistor." If you sub a resistor for the CCS (one large enough to not kill the gain, say 5-10x rp) and correspondingly raise the B+, do you see a noise decrease? Brian, have you tried a transformer with a smaller step-up ratio? I was very pleased with the change from a Peerless 4722 (32x) to the Sowter 8055X (10x), both loaded with optimized Zobels.  

• 2014-10-25 1:49 pm

Thanks Frank, and Hello Stuart. It's good to know that at least one of my many audio phobias was remembered. Some people have phobias of spiders, some of heights; the phobia that gives me night sweats is non-linear capacitance in the plate load. Actually, Frank, your low composite plate resistance working against the low capacitance of that RF FET is probably A-OK, pushing any non-linearly modulated pole out to about where the Christian rock stations are on the FM dial. The IDSS of your FET load is between 2 and 6.5mA. What selection did you like best? The SP-10 uses a pair of 6922s in parallel sharing 6.1mA, delivered by a 40K plate resistor. There is also a shared 150 ohm resistor in the cathodes, where you have none. So I'm guessing your step-up could be roughly 1 to 3 dB quieter in theory, depending on frequency (1/f versus white noise, etc), helpful but maybe not enough to bother with in my instance. I do think a lower turns-ratio transformer might be the cat's meow. I'll have to look into the Sowter 8055X with Zoebels. Or maybe hand-wind my own on toroids? This project is not high on my priority list since my phono set-up is quite listenable and I've got a line-stage/crossover/Blumlein Shuffler project ahead of it. By the way, did you fellows see the paper in a recent AES journal about finding the optimum plate current for lowest noise in triodes? Off the top of my head, I can't recall the author, with whom I shared an interesting private correspondence. Perhaps there was a thread on it here that I didn't see.  

• 2014-10-25 2:01 pm
• 2014-10-25 2:28 pm

Yes, Merlin is the gent I was thinking of. Very useful paper. There haven't been many papers in recent decades that add anything to the understanding of vacuum tube fundamentals, but this one did. I'll have to read that thread.  

• 2014-10-25 6:46 pm

If you sub a resistor for the CCS (one large enough to not kill the gain, say 5-10x rp) and correspondingly raise the B+, do you see a noise decrease? Click to expand...

• 2015-08-25 8:55 pm

I thought this post needed a little re-visiting, considering I would like to try my hand at an all tube MC pre, I haven't found much information on this pre from ARC, the archive page says that it was reviewed by Stereophile about the same time it was introduced and was given a positive review by John Atkinson. I have been wanting to "grab the bull by the horns" on this endeavor, and have done quite a bit of research on what might be the best way to approach this. I know that Mr. John Broskie has had several article's on His Tube Cad Journal site, expressing his interest to do the same. Since I am so fond of mu-followers for their low noise, and distortion, I was thinking why not implement this topology, of course using paralleled 6922 triodes for the input? What would be the possible S/N figures for this one, would 80dB be out of the question, using stabilized B+, heaters, etc.?  

• 2015-08-25 10:01 pm
• 2015-08-25 10:42 pm

denny9167 said: What would be the possible S/N figures for this one, would 80dB be out of the question, using stabilized B+, heaters, etc.? Click to expand...

• 2015-08-25 10:44 pm

denny9167 said: ...using paralleled 6922 triodes for the input...would 80dB be out of the question...? Click to expand...

• 2015-08-25 10:45 pm

Oh, didn't see your post, Stuart. I guess we agree...  

• 2015-08-25 10:52 pm
• 2015-08-25 10:55 pm
• 2015-08-26 12:04 am

SY said: Brian, have you tried a transformer with a smaller step-up ratio? I was very pleased with the change from a (32x) to the Sowter 8055X (10x), both loaded with optimized Zobels. Click to expand...

• 2015-08-26 12:52 am
• 2015-08-26 9:46 pm

fdegrove said: Hi, Nice posting Brian. So once the needle hits the groove that's the noise (SN/R) you're going to have to live with, right? FWIW, I did compare my own phono pre and its add on MC stage to a ARC SP10 and they sounded not that different at all. I have one advantage over the ARC unit in that my pre-preamp can take a wider variety of MCs. I.e lower output ones. I feel that sometimes we focus too much on a single aspect. Nonetheless, if one can't hear any obvious difference between LP and CD playback then the phono rig can't be too far off the mark I reckon. Cheers, Click to expand...

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Audio Research Moving Coil Tube Phono Preamp – Model: MCP-33

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Very rare black prepre (preamplifier for connecting MC pickups to MM phone inputs) in tube technology. Works internally with 6 tubes. Impedance (1, 3, 10, 30, 100 Ohm) and amplification (16, 20, 24 db) selectable.

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Opinion of Audio Research MCP-2 phono pre?

• Thread starter efhjr
• Start date Oct 4, 2013

Can you be more specific?

• Oct 4, 2013

Audio Research MCP-2 . This is an early-80s SS phono pre, with two inputs. Many MC gain and load settings. I kinda want one, and think it could be a good match with my SP-6B preamp. Does anybody have any experience with this unit?  

Blue Shadow

Waiting for vintage gear from this century.

There are discussions about the ARC analog modules being NLA so if one goes, the module needs to be reverse engineered or the unit becomes a doorstop. I'm not sure of AM-3 in this unit but the ones in the SP-4 are not available.  

That's good to know, Blue Shadow. That hadn't occurred to me. I just may give ARC a call and get their two cents.  

• Feb 7, 2014

I finally got around to calling ARC about this unit. The nice fellow (Calvin?) told me it's pretty much at end of life -- the AM9 modules used in the output are no longer available. Pity.  

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Gagarin Cup Preview: Atlant vs. Salavat Yulaev

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Gagarin cup (khl) finals:  atlant moscow oblast vs. salavat yulaev ufa.

Much like the Elitserien Finals, we have a bit of an offense vs. defense match-up in this league Final.  While Ufa let their star top line of Alexander Radulov, Patrick Thoresen and Igor Grigorenko loose on the KHL's Western Conference, Mytischi played a more conservative style, relying on veterans such as former NHLers Jan Bulis, Oleg Petrov, and Jaroslav Obsut.  Just reaching the Finals is a testament to Atlant's disciplined style of play, as they had to knock off much more high profile teams from Yaroslavl and St. Petersburg to do so.  But while they did finish 8th in the league in points, they haven't seen the likes of Ufa, who finished 2nd. 

This series will be a challenge for the underdog, because unlike some of the other KHL teams, Ufa's top players are generally younger and in their prime.  Only Proshkin amongst regular blueliners is over 30, with the work being shared by Kirill Koltsov (28), Andrei Kuteikin (26), Miroslav Blatak (28), Maxim Kondratiev (28) and Dmitri Kalinin (30).  Oleg Tverdovsky hasn't played a lot in the playoffs to date.  Up front, while led by a fairly young top line (24-27), Ufa does have a lot of veterans in support roles:  Vyacheslav Kozlov , Viktor Kozlov , Vladimir Antipov, Sergei Zinovyev and Petr Schastlivy are all over 30.  In fact, the names of all their forwards are familiar to international and NHL fans:  Robert Nilsson , Alexander Svitov, Oleg Saprykin and Jakub Klepis round out the group, all former NHL players.

For Atlant, their veteran roster, with only one of their top six D under the age of 30 (and no top forwards under 30, either), this might be their one shot at a championship.  The team has never won either a Russian Superleague title or the Gagarin Cup, and for players like former NHLer Oleg Petrov, this is probably the last shot at the KHL's top prize.  The team got three extra days rest by winning their Conference Final in six games, and they probably needed to use it.  Atlant does have younger regulars on their roster, but they generally only play a few shifts per game, if that. 

The low event style of game for Atlant probably suits them well, but I don't know how they can manage to keep up against Ufa's speed, skill, and depth.  There is no advantage to be seen in goal, with Erik Ersberg and Konstantin Barulin posting almost identical numbers, and even in terms of recent playoff experience Ufa has them beat.  Luckily for Atlant, Ufa isn't that far away from the Moscow region, so travel shouldn't play a major role. 

I'm predicting that Ufa, winners of the last Superleague title back in 2008, will become the second team to win the Gagarin Cup, and will prevail in five games.  They have a seriously well built team that would honestly compete in the NHL.  They represent the potential of the league, while Atlant represents closer to the reality, as a team full of players who played themselves out of the NHL. 

• Atlant @ Ufa, Friday Apr 8 (3:00 PM CET/10:00 PM EST)
• Atlant @ Ufa, Sunday Apr 10 (1:00 PM CET/8:00 AM EST)
• Ufa @ Atlant, Tuesday Apr 12 (5:30 PM CET/12:30 PM EST)
• Ufa @ Atlant, Thursday Apr 14 (5:30 PM CET/12:30 PM EST)

Games 5-7 are as yet unscheduled, but every second day is the KHL standard, so expect Game 5 to be on Saturday, like an early start. 

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635th Anti-Aircraft Missile Regiment

635-й зенитно-ракетный полк

Military Unit: 86646

Activated 1953 in Stepanshchino, Moscow Oblast - initially as the 1945th Anti-Aircraft Artillery Regiment for Special Use and from 1955 as the 635th Anti-Aircraft Missile Regiment for Special Use.

1953 to 1984 equipped with 60 S-25 (SA-1) launchers:

• Launch area: 55 15 43N, 38 32 13E (US designation: Moscow SAM site E14-1)
• Support area: 55 16 50N, 38 32 28E
• Guidance area: 55 16 31N, 38 30 38E

1984 converted to the S-300PT (SA-10) with three independent battalions:

• 1st independent Anti-Aircraft Missile Battalion (Bessonovo, Moscow Oblast) - 55 09 34N, 38 22 26E
• 2nd independent Anti-Aircraft Missile Battalion and HQ (Stepanshchino, Moscow Oblast) - 55 15 31N, 38 32 23E
• 3rd independent Anti-Aircraft Missile Battalion (Shcherbovo, Moscow Oblast) - 55 22 32N, 38 43 33E

Disbanded 1.5.98.

Subordination:

• 1st Special Air Defence Corps , 1953 - 1.6.88
• 86th Air Defence Division , 1.6.88 - 1.10.94
• 86th Air Defence Brigade , 1.10.94 - 1.10.95
• 86th Air Defence Division , 1.10.95 - 1.5.98

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Elektrostal , Moscow Oblast, Russia

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Savvino-storozhevsky monastery and museum.

Zvenigorod's most famous sight is the Savvino-Storozhevsky Monastery, which was founded in 1398 by the monk Savva from the Troitse-Sergieva Lavra, at the invitation and with the support of Prince Yury Dmitrievich of Zvenigorod. Savva was later canonised as St Sabbas (Savva) of Storozhev. The monastery late flourished under the reign of Tsar Alexis, who chose the monastery as his family church and often went on pilgrimage there and made lots of donations to it. Most of the monastery’s buildings date from this time. The monastery is heavily fortified with thick walls and six towers, the most impressive of which is the Krasny Tower which also serves as the eastern entrance. The monastery was closed in 1918 and only reopened in 1995. In 1998 Patriarch Alexius II took part in a service to return the relics of St Sabbas to the monastery. Today the monastery has the status of a stauropegic monastery, which is second in status to a lavra. In addition to being a working monastery, it also holds the Zvenigorod Historical, Architectural and Art Museum.

Belfry and Neighbouring Churches

Located near the main entrance is the monastery's belfry which is perhaps the calling card of the monastery due to its uniqueness. It was built in the 1650s and the St Sergius of Radonezh’s Church was opened on the middle tier in the mid-17th century, although it was originally dedicated to the Trinity. The belfry's 35-tonne Great Bladgovestny Bell fell in 1941 and was only restored and returned in 2003. Attached to the belfry is a large refectory and the Transfiguration Church, both of which were built on the orders of Tsar Alexis in the 1650s.  

To the left of the belfry is another, smaller, refectory which is attached to the Trinity Gate-Church, which was also constructed in the 1650s on the orders of Tsar Alexis who made it his own family church. The church is elaborately decorated with colourful trims and underneath the archway is a beautiful 19th century fresco.

Nativity of Virgin Mary Cathedral

The Nativity of Virgin Mary Cathedral is the oldest building in the monastery and among the oldest buildings in the Moscow Region. It was built between 1404 and 1405 during the lifetime of St Sabbas and using the funds of Prince Yury of Zvenigorod. The white-stone cathedral is a standard four-pillar design with a single golden dome. After the death of St Sabbas he was interred in the cathedral and a new altar dedicated to him was added.

Under the reign of Tsar Alexis the cathedral was decorated with frescoes by Stepan Ryazanets, some of which remain today. Tsar Alexis also presented the cathedral with a five-tier iconostasis, the top row of icons have been preserved.

Tsaritsa's Chambers

The Nativity of Virgin Mary Cathedral is located between the Tsaritsa's Chambers of the left and the Palace of Tsar Alexis on the right. The Tsaritsa's Chambers were built in the mid-17th century for the wife of Tsar Alexey - Tsaritsa Maria Ilinichna Miloskavskaya. The design of the building is influenced by the ancient Russian architectural style. Is prettier than the Tsar's chambers opposite, being red in colour with elaborately decorated window frames and entrance.

At present the Tsaritsa's Chambers houses the Zvenigorod Historical, Architectural and Art Museum. Among its displays is an accurate recreation of the interior of a noble lady's chambers including furniture, decorations and a decorated tiled oven, and an exhibition on the history of Zvenigorod and the monastery.

Palace of Tsar Alexis

The Palace of Tsar Alexis was built in the 1650s and is now one of the best surviving examples of non-religious architecture of that era. It was built especially for Tsar Alexis who often visited the monastery on religious pilgrimages. Its most striking feature is its pretty row of nine chimney spouts which resemble towers.

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