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Old 26th January 2007, 11:45 PM   #1441
ulibub is offline ulibub  France
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Hi all,

thanks for all your lovely comments, I appreciate them very much!

Yes, this project has developed into a real battle of material. It showed to be much more complex and difficult than thought at the beginning. The Circlotron principle is a perfect design from its sonic performance, but it proved to be quite difficult on the technical site - especially with the very demanding 6C33CB-tube. "Pulling a tiger at its tail" somebody once wrote on this forum about this tube, and - that's really true.... But having overcome all obstacles finally, it is an incredibly "straightforward" sounding amp, very neutral, perfectly controlled bass (never heard such in tube amps before), but unforgiving in unmasking poor quality recordings....

Nothing for people who love the "lovely, smooth tube sound"....

Quote:
Originally posted by 4fun
Hi,

Please one more photo, whith light turned down in room.
OK, here it is:

Click the image to open in full size.

The blue shining wallpaper behind the amp is originally white... - not only reflecting the light of the mercury rectifiers, but also it's optical brighteners fluorescing due to some UV-radiation emitted by them....

But the camera increases the brightness of the mercury tubes quite much.

Maybe I should add some illumination to the meters.... yellow colour
is still missing...

Uli
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Old 27th January 2007, 12:08 AM   #1442
ulibub is offline ulibub  France
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Quote:
Originally posted by FastEddy
ulibub: ... gotta be a valve maker's wet dream ... Very nice, very busy ... how many channels?
hmmm - maybe JJ did enjoy it...... I like their tubes very much, all pre-stage tubes, as far as available, are from them. Frame-grid ECC 82, and especially the ECC 99, which reallly filled a gap in driver triodes. Since it provides the voltage swing for the 6C33CB-tubes, it is in a very critical position in the amp. And in my Circlotron, running mostly with only 100 mA (or less) quiescent current, resulting in someting around -130 V bias (at 260 V plate), I still can drive the power tubes into grid current.... JJ recommends them as drivers for 300B and 2A3, but they just can add the mighty 6C33CB, even working quite at its limits.

So its a simple stereo amplifier only, not even OTL, but with low-ratio toroidal OPTs, who add a lot to its good performance.

Uli
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Old 27th January 2007, 02:18 AM   #1443
JoshK is offline JoshK  Canada
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Those mercury tubes look badd@$$! Ozone in the making.

What kind of indicator tubes do you have in front? Are those clipping indicators or something else?
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Old 27th January 2007, 03:15 AM   #1444
v-bro is offline v-bro  Netherlands
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Not diy, but impressive, high toob count, and and old time favorite...
Attached Images
File Type: jpg audio-research-31.jpg (14.7 KB, 2165 views)
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Max. cone displacement can be several foot on any speaker!Too bad it can be done only once......
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Old 27th January 2007, 04:15 AM   #1445
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Quote:
Originally posted by v-bro
Not diy, but impressive, high toob count, and and old time favorite...
Is it your power supply for a preamp?
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Old 27th January 2007, 05:07 AM   #1446
v-bro is offline v-bro  Netherlands
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No, it's the power supply for the blue led in my preamp...

Preamp itself is passive...
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Max. cone displacement can be several foot on any speaker!Too bad it can be done only once......
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Old 27th January 2007, 09:23 AM   #1447
ulibub is offline ulibub  France
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Hi JoshK!

Quote:
Originally posted by JoshK
Those mercury tubes look badd@$$! Ozone in the making.
No, they don't produce any Ozone. It forms only at wavelengths in the far short-UV, below about 200nm, tho which the glass bulbs are completely "dark". So only minor long-wavelength-UV portions should come out of the bulbs. See also thread 6C33 design comments.

Quote:
What kind of indicator tubes do you have in front? Are those clipping indicators or something else?
These are level indicators, NOS Telefunken EM 800 "magic bands". Their band grows from the lower end in one line to the top (so like an LED level meter), contrary to the (pin-compatible) EM 84/87, where the band grows from both ends towards the middle. They are among the last developed indicator tubes during the 60's.....

Uli
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Old 28th January 2007, 08:43 PM   #1448
Irakli is offline Irakli  United States
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Default ME2/Amity/Raven System

Hi All!

Finally I reached the end of a long journey and got the system I am really happy with.

Here is the brief description of the system:
Speakers: ME2 + Subwoofers
Power amps: Amity tube amps for Hi/Mid and Adcom 5500 for subs
Preamp: Raven
Active filter for subs: behringer DCX2496
Turntable: Thorens 166MKII
CD player: Sony SCD 222ES

Here are the photos of the speakers and amps:
http://new.photos.yahoo.com/irakli_s...60762387277348

Speaker and amp construction projects are described in detail on Lynn Olson's site www.nutshellhifi.com


Just wanted to share my excitement
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Old 28th January 2007, 08:57 PM   #1449
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It might ne nice to see these here and in the AudioAsylum.com Photo gallery ... Yahoo is not very photo friendly to Apple Mac Safari or Thunderbird ... One must "right click" each photo and "open in a new window" = time consuming

The photos you have here do make the effort worthwhile = nice equipment!!

I especially like the Raven 3 ... your design?? Anything with balanced inputs stands apart from the norm IMOP.

Also, is that a room EQ (Beringer) ??
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Old 28th January 2007, 09:33 PM   #1450
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Default Re: ME2/Amity/Raven System

Quote:
Originally posted by Irakli
Speakers: ME2 + Subwoofers
Power amps: Amity tube amps for Hi/Mid and Adcom 5500 for subs
Preamp: Raven

I am considering going to the same thing. Only have the ME-2 with a triode-connected ST70 and powered subwoofer.

How is your midbass (150-400 Hz)? I have found mine to be somewhat light and quiet in comparision to the rest of the program material. My hope is that migrating to an Amity will give the additional punch I need.

I would sooo like to hear your system...........
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