single ended OTL Transcendent
Has anyone built or heard the small power SE OTL from Transcendent?
I have over 100 dB speakers and I am tempted. Just as gift for X mass for myself. I have numerous tube amps, but have never ever had OTL in my system.
Any input?
Thanks,
ed
Has anyone built or heard the small power SE OTL from Transcendent?
I have over 100 dB speakers and I am tempted. Just as gift for X mass for myself. I have numerous tube amps, but have never ever had OTL in my system.
Any input?
Thanks,
ed
I built a kit. IMHO it is an excellent amp. Most powerful 1.5 Watts I ever used.
I use with Jerico Horns. One thing though, it runs HOT, yes its class A and it should run warmer than usual. Did I say it runs HOT?
I mean it runs HOT so make sure it has room around it and is not placed in an enclosed rack or something similar.
I of course had to play around with it and replaced the stock Solen interstage coupling caps with Dynamicaps and replaced the stock rectifiers with hexfreds.
Did that make a difference? Dunno, it sounded great stock and still does, it might be smoother now.
I also tried replacing the stock output caps with fancy $$$$ Black Gates. Put back in the stock electrolytics after a few months, the Black Gates do not work in this application.
Standouts for me are the bass and clarity, the rest of it sounds very good🙂
Andrew
I use with Jerico Horns. One thing though, it runs HOT, yes its class A and it should run warmer than usual. Did I say it runs HOT?
I mean it runs HOT so make sure it has room around it and is not placed in an enclosed rack or something similar.
I of course had to play around with it and replaced the stock Solen interstage coupling caps with Dynamicaps and replaced the stock rectifiers with hexfreds.
Did that make a difference? Dunno, it sounded great stock and still does, it might be smoother now.
I also tried replacing the stock output caps with fancy $$$$ Black Gates. Put back in the stock electrolytics after a few months, the Black Gates do not work in this application.
Standouts for me are the bass and clarity, the rest of it sounds very good🙂
Andrew
Re: single ended OTL Transcendent
Neither have I. My horns are over 100dB efficient horns and I was contemplating building an Atma-Sphere M-60 Mk.II clone, but the old ASOG (Atma Sphere Owner's Group) website is gone and have not been able to find a schematic - still looking.
Like someone else pointed out, the amps run hot! The reason I like the Atma-Sphere fully balanced differential bridge design is that one should be able to reduce the number of tubes, equal number per side, to better manage the heat.
adason said:
Neither have I. My horns are over 100dB efficient horns and I was contemplating building an Atma-Sphere M-60 Mk.II clone, but the old ASOG (Atma Sphere Owner's Group) website is gone and have not been able to find a schematic - still looking.
Like someone else pointed out, the amps run hot! The reason I like the Atma-Sphere fully balanced differential bridge design is that one should be able to reduce the number of tubes, equal number per side, to better manage the heat.
Great!
I'll let Bruce know to prepare my commission 😀
Just kidding!
It really is a great amp.
Andrew
Well, folks, the kit arrived, and four evenings of labour later, I have single ended output transformerless house heater...err, amplifier. Its happily burning in right now with just a testing speakers for now. Too soon to be plugged in into line array or horns. Will report later. Here is pic of finished amp.
ed
ed
Attachments
Very nice! Have you got a chance to listen to it yet on a efficient pair of speakers? Their T-16 stereo kit looks pretty sweet too.
yes, after few days of testing, i decided to plug it into my horn speakers (18" cervin vega, radian compression for midrange, cervin vega horn tweeter)
amp is not fully after break in, so I expect the sound to further change
here are the first impressions:
transcendent otl amp replaced my highly tweaked magnavox single ended el84 amp
sound is different, much cleaner, less sweet, much more transparent, if that is what one prefers
magnavox has 2-5% distortion, so the sweetness is probably overdone
transcendent does not seems to have much distortion at all
if one word should describe the sound, clean would be the word
it has nice hights, which were little sharp at first, but once tubes had hours on them, it got better, nice shimmering hights, midrange is crystal clear, from first moment, like no glass in windows clean, bass is there, its deep, but its not as authoritative as solid state bass, definitely not muddy as se tube bass can be
i was expecting a little more bass, but that might improve later, but than again, I am comparing to solid state amp, since I had system biamped
so far very happy with the result
amp is not fully after break in, so I expect the sound to further change
here are the first impressions:
transcendent otl amp replaced my highly tweaked magnavox single ended el84 amp
sound is different, much cleaner, less sweet, much more transparent, if that is what one prefers
magnavox has 2-5% distortion, so the sweetness is probably overdone
transcendent does not seems to have much distortion at all
if one word should describe the sound, clean would be the word
it has nice hights, which were little sharp at first, but once tubes had hours on them, it got better, nice shimmering hights, midrange is crystal clear, from first moment, like no glass in windows clean, bass is there, its deep, but its not as authoritative as solid state bass, definitely not muddy as se tube bass can be
i was expecting a little more bass, but that might improve later, but than again, I am comparing to solid state amp, since I had system biamped
so far very happy with the result
atma 60mkII
hi korneluk,
Did you find Atma-Sphere 60mkII? I also want to clone this unit.
'just tired of interneting to find this circuit. If you have now, I'll appreciate if you could share it to me. tks
hi korneluk,
Did you find Atma-Sphere 60mkII? I also want to clone this unit.
'just tired of interneting to find this circuit. If you have now, I'll appreciate if you could share it to me. tks
Re: atma 60mkII
Follow the link for an actual working M-60 clone with improved driver circuit.
http://www.klausmobile.narod.ru/projects/pr_01_mamont_e.htm
Each channel (monoblock) requires 6 6SN7s and 8 6AS7s.
Enjoy,
-- josé k.
Ricdelros said:
Follow the link for an actual working M-60 clone with improved driver circuit.
http://www.klausmobile.narod.ru/projects/pr_01_mamont_e.htm
Each channel (monoblock) requires 6 6SN7s and 8 6AS7s.
Enjoy,
-- josé k.
Attachments
adason said:
Congrats on your build. I'm curious as to how difficult it was? I looked at your internals pic and wires seem to be running in a lot of directions!
Re: Re: atma 60mkII
Looks like a pretty decent design. However, adding some gNFB would help with the bass problem he mentions, and help clean up the nonlinearity of operating the 6AS7 cathode followers into such a steep loadline.
Also, needs a DC offset servo. As it stands here, it's a speek-poofer waiting to happen. Especially when you consider that attention to balance between sections of the 6AS7 isn't what it should be. After all, the 6AS7 is supposed to be used as a series pass device in a regulator (where balance between sections is not so important) not an audio final.
korneluk said:
Looks like a pretty decent design. However, adding some gNFB would help with the bass problem he mentions, and help clean up the nonlinearity of operating the 6AS7 cathode followers into such a steep loadline.
Also, needs a DC offset servo. As it stands here, it's a speek-poofer waiting to happen. Especially when you consider that attention to balance between sections of the 6AS7 isn't what it should be. After all, the 6AS7 is supposed to be used as a series pass device in a regulator (where balance between sections is not so important) not an audio final.
My friends runs one with his AER Mk1 (103dB) in singular cabinets.
He is very happy with it. I haven;t managed to get over there to hear it yet.
There was only one thing he didnt like much about it (and he is the most fastidious technician I have ever seen), the power cable run all the way across the middle to the power switch and back again.
If this bothers you as well you just wire it up without the switch in the circuit and switch it on and off at the wall.
I'd like one but I'd need the big daddy one, My speakers are only 95dB/w and I like it loud.
He is very happy with it. I haven;t managed to get over there to hear it yet.
There was only one thing he didnt like much about it (and he is the most fastidious technician I have ever seen), the power cable run all the way across the middle to the power switch and back again.
If this bothers you as well you just wire it up without the switch in the circuit and switch it on and off at the wall.
I'd like one but I'd need the big daddy one, My speakers are only 95dB/w and I like it loud.
atma 60mkII
Thanks korneluk,
Great circuit, I had enough informations now. I'll gather some parts and let's hear what happen after I completed it.
Thanks korneluk,
Great circuit, I had enough informations now. I'll gather some parts and let's hear what happen after I completed it.
adason said:
Glad to hear it was an easy build. and I hope that you're really enjoying it. There is no satisfaction quite like the satisfaction of building something that makes beautiful music! 😀
This Transcedent OTL is really an excellent amplifer, we tried it out on one of my friend's horn system yesterday... Below is a picture of my friend's handiwork.. layed out as neat as he could... 😉
An externally hosted image should be here but it was not working when we last tested it.
All,
In the "other audio forum" Ralph Karsten recently announced that Atma-Sphere is going to start selling kits again. The way I understand it, it will be based on the M-60 model and they are waiting for the sheet metal to come in-house before they offer the kit to the public.
Needless to say this has generated a lot of excitement in the OTL community. I've corresponded with Ralph via email and I'm waiting to hear back on the availability and price of the kit.
Will keep you posted as details become available,
-- josé k.
In the "other audio forum" Ralph Karsten recently announced that Atma-Sphere is going to start selling kits again. The way I understand it, it will be based on the M-60 model and they are waiting for the sheet metal to come in-house before they offer the kit to the public.
Needless to say this has generated a lot of excitement in the OTL community. I've corresponded with Ralph via email and I'm waiting to hear back on the availability and price of the kit.
Will keep you posted as details become available,
-- josé k.
Re: Re: atma 60mkII
Very-very nice design. Excellent. 6N1P tubes may be used there instead of 6N8S. Also, may be easily configured for symmetrical input.
I don't know the guy who designed it, but he is definitely The Master.
korneluk said:
Very-very nice design. Excellent. 6N1P tubes may be used there instead of 6N8S. Also, may be easily configured for symmetrical input.
I don't know the guy who designed it, but he is definitely The Master.
- Status
- Not open for further replies.