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"....
OK, here it is:
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
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"....
4fun said:
OK, here it is:
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
FastEddy said: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
Hi JoshK!
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.
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
JoshK said: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.
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
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_sam/album/576460762387277348
Speaker and amp construction projects are described in detail on Lynn Olson's site www.nutshellhifi.com
Just wanted to share my excitement
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_sam/album/576460762387277348
Speaker and amp construction projects are described in detail on Lynn Olson's site www.nutshellhifi.com
Just wanted to share my excitement
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) ??
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) ??
Re: ME2/Amity/Raven System
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...........
Irakli said:
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...........
ME2/Amity/Raven System
Thanks for your nice comments guys
Schematics is all Lynn Olson's. I only added input switcing. Its just a bunch of reed relays. also I used different volune control principle. Instead of two variable resistors I used one connected between hot and cold balanced inputs. Much easier and cheaper.
It is an active filter. I am using it as a sub crossover, 80Hz 4th order Bessel.
I have more midbass than I want. Still tweaking sub integration. BTW, Amity amps for Mid/Hi using a high pass first order filter (80Hz) at the input. For sub, as I mentioned above, its 80Hz 4th order Bessel.
These subs give amazing level of bass and very clean and tight too.
Thanks for your nice comments guys
Schematics is all Lynn Olson's. I only added input switcing. Its just a bunch of reed relays. also I used different volune control principle. Instead of two variable resistors I used one connected between hot and cold balanced inputs. Much easier and cheaper.
It is an active filter. I am using it as a sub crossover, 80Hz 4th order Bessel.
I have more midbass than I want. Still tweaking sub integration. BTW, Amity amps for Mid/Hi using a high pass first order filter (80Hz) at the input. For sub, as I mentioned above, its 80Hz 4th order Bessel.
These subs give amazing level of bass and very clean and tight too.
my we717a pre-amp
Grade before lovely WE 717A vacuum tube
Introduction to 717A vacuum tube
DataSheet
Raytheon
[url =http://www.r-type.org/exhib/aab0012.htm]Tung-sol[/url]
Only two manufacturers Tung-sol and Raytheon made
Make times : 1943
DIY machine of Japan
717A-3C33(PP) -1
717A-45(SE)
717A-6L6_EL34-811A_808(SE)
717A-3C33(PP) -1
717A-71A(PP)
717A-205D(SE)
717A-EL156_KT88(SE)
717A-316A
717A-811A(SE)
Original plan, the high-pressure steady voltage should adopt 6AQ5 +E80F +85A2
717A family takes a group photo greatly
Make the high-pressure steady voltage into GEC A2134 + EC88 + 85A2
Grade before lovely WE 717A vacuum tube
Introduction to 717A vacuum tube
DataSheet
Raytheon
[url =http://www.r-type.org/exhib/aab0012.htm]Tung-sol[/url]
Only two manufacturers Tung-sol and Raytheon made
Make times : 1943
DIY machine of Japan
717A-3C33(PP) -1
717A-45(SE)
717A-6L6_EL34-811A_808(SE)
717A-3C33(PP) -1
717A-71A(PP)
717A-205D(SE)
717A-EL156_KT88(SE)
717A-316A
717A-811A(SE)
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Original plan, the high-pressure steady voltage should adopt 6AQ5 +E80F +85A2
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
717A family takes a group photo greatly
An externally hosted image should be here but it was not working when we last tested it.
Make the high-pressure steady voltage into GEC A2134 + EC88 + 85A2
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Jore: Great photos!! Great layout and construction!!!
(Wondering if you have a design with balanced inputs and outputs?)
(Folks: I had to edit the web links above to get 'em to work = Ex: http://www.tubebbs.com/tubedata/sheets/127/7/713A.pdf )
(Wondering if you have a design with balanced inputs and outputs?)
(Folks: I had to edit the web links above to get 'em to work = Ex: http://www.tubebbs.com/tubedata/sheets/127/7/713A.pdf )
...
amp pictures
This is my da42 se amp with da42,6sl7gtand 6sn7gt. this should run at a 1000 volts at 40ma, but I only use 517 volts at 75ma, I had to use what I had. Iv'e got a dodgy bias pot so it flashes sometimes when the ma's climb. I will get round to using 1000volts at 40ma, someday!!
This is my da42 se amp with da42,6sl7gtand 6sn7gt. this should run at a 1000 volts at 40ma, but I only use 517 volts at 75ma, I had to use what I had. Iv'e got a dodgy bias pot so it flashes sometimes when the ma's climb. I will get round to using 1000volts at 40ma, someday!!
Attachments
The one on the left is a p/p , using 6ch6, ef86, 5u4g and ecc82. it's in my living room now. Iam listening to it now, thro' my 2ft x 4ft planar full range speakers. Iam using a £19 dvd player, playing a mp3 on a dvd I burned myself. The Amp on the right is a se amp using only 4 valves :-2 x 6au5gt's, 1 x 5u4g and 1 x 6922. I use this with a Quad 33 pre-amp. About 5watts I think. Sounds very nice. The amp at the top is the 300a se amp.All these amps were in my conservatory, but they are all in different places now.
Attachments
This is my medium full range planar speaker under construction in the living room! I had just finished sticking the aluminium foil on. This is the hardest part on your back, all that bending over. Rip the tape and you have to start again, very boring and time consuming. But well worth it when you switch on. Even worse with neos they are a lot smaller. I am going to build a neo speaker about the same size, about a thousand magnets for the pair, the aluminium foil will be a challenge, on my back and my patience. The old planar speakers in the background with no speaker cloth on were the first pair I ever built, after seeing an article in the Hi-Fi News about 20yrs ago.
Attachments
Yes I have got some more photos just a matter of finding them, then getting them on site. Having never done this before, I'm learning as I go along. So please bear with me! This a photo of the finished speaker. Behind it to the left is my underfloor loaded speaker. Above it is a Aiwa AP2600 Direct Drive Transcription unit. On the rack is a small part of my equipment. I am not married and live on my own, so I can please myself, lucky me, nobody to nag me!!! Iam afraid you will have to rotate the picture. The photo company put on the disc that way round.
