|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
73.50.49.151
A photo which Ralph sent today of someone's control unit. I should have my demo unit by week's end.
Click the image for the full size view (it's quite large).
The tube complement has changed, among other things.
From the MP-1 page on the Atma-Sphere website:"The phono section of the new preamp has more gain and is significantly lower noise than any prior version. In fact it's so quiet that the only way we could achieve the same numbers before was with a Low Output Moving Coil step-up transformer. There is so much more output that the phono is usually at about the same level as many digital sources. The line section is now lower distortion and also has a new shunt-style Gain Trim system that allows for greater control of the gain of the line stage, so high output digital sources are no longer an issue."
Dealer disclosure.
Brian
So much music, so little time!
Follow Ups:
Will be mated to some Novacrons.......very excited!
(Dealer disclaimer)
My system is complete with my new MP-1 MK 3.3 just lovely!!!!!!!
(Dealer disclaimer)
Congratulations, sk! Superb addition to any system
Preamp section - V-Caps in phono section, damping package, remote volume control.
Power supply
Brian
So much music, so little time!
Brian, I have stared at your photos many times before now, but today I notice that in the left rear corner of the PS chassis, there appears to be a loose washer. If I am correct, it's probably harmless, but obviously you may want to remove it lest it short something out.
Also re the question about Vcaps, yours seems to have Vcaps on the phono section output stage, coupling to the linestage. But elsewhere I think I see REL TFTF teflon capacitors (mostly), which are also very expensive and excellent sounding. Few manufacturers use parts of this quality, regardless of retail cost.
and it's not a loose washer; it's more likely the top side of a threaded insert for the feet. Sorry about that.
I didn't notice anything rattling around inside. It might be worth a look to see what you described, though.
Brian
So much music, so little time!
I think by now you've discovered that I was wrong in the first instance. What I see there is probably the top of the threaded insert for the footer. Viewed from above, as in the photo you posted, it appears to be a free washer, because it is bare metal and washer-shaped.
Cpmpared to the previous incarnation?
Quiet. Dynamic. More "there."
Brian
So much music, so little time!
Hey Brian
Did I see on the Atma website, all the capacitors can be upgraded to the V-Cap?
One option available is V-Caps throughout, so yes, I think you are correct.
Brian
So much music, so little time!
should have it in about a month, hopefully sooner!
(Dealer disclaimer)
is a thing of beauty. IMO, one of the unappreciated bargains in commercial audio. Looks like they've gone to ladder type attenuators, motor-driven. Is that so?
-was replaced by a Shallco part similar to what you see in the photo with the introduction of the MkII (about 1997).
I'm guessing you must have a Mk1 to be asking that question (I know your preamp is modified but it must have started life as a Mk1).
Both controls are built along the same lines; the Mk1 employed a custom Electro-Switch part (similar to what you see in a Convergent preamp, but more decks). The Shallco part of the MkII and later sounds a little better purely on account of its construction.
With the Mk3.1, the taper of the control was changed to reduce Miller effects mid-band in the control and to make the use of digital products easier. The Mk3.2 took this a step further; in the Mk3.3 the Gain Trim controls were changed to a shunt-style system making them secondary volume controls in their own right so now you can set up the gain structure however you want.
This was important because in the Mk3.3 the phono gain is so much higher that with most LOMC cartridges the output is about the same as you see from digital sources. If you had speakers with more than about 95 db 1 watt/1 meter or an amplifier with over 30db of gain, you might have had troubles with the main control not having enough notches at the bottom end of its range. With the Gain Trim system thus updated this problem is eliminated without a down side.
Yes, my unit is a Mark I and has the Electroswitch volume control, but more important than the brand, mine has (or had) a series type attenuator, and I was asking whether the Shallco attenuator is a ladder type. About a year or two ago, I replaced the Electroswitch attenuator with a stereo balanced shunt type, using nude Vishay resistors. That was quite a worthwhile upgrade.
As you know, on the old PCB, there just is no room for a stereo balanced ladder type attenuator, because the tubes interfere. Thus I concocted a shunt type, which fits nicely.
Yes, that is what you get with the remote volume control option.
Brian
So much music, so little time!
That IS a thing of beauty.
Where should I list my MP-1 mk3.2 "for sale"?
How much should I ask for it?
The update for a MkIII, 3.1 or 3.2 is involving mostly the preamp section and some minor power supply work.
Thank you Ralph
I'll let you know when it's on it's way.
Bill Laleff
Euphoria Speaker Design
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: