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Post by Deleted on Nov 28, 2011 10:54:23 GMT
Meet another hybrid. here with 600 Ohm DT990 and Philips 6DJ8/ECC88 a derivative (in kit form) will be launched by Jeremy in due time. It uses a high voltage/high current opamp output stage instead of SE MOSFET/CCS, so no increased distortion with lower headphone impedances, and it has autobias. So pop in a tube and it sets the cathode voltage by itself, no need to adjust or check after some time. Works on external 48V DC SMPS, 70mA current. No hot components (other than the tube/valve). Some specs: Output resistance: 0.2 Ohm and 120 Ohm selectable. Freq range: (-0.5dB 120 Ohm load) 3Hz - 65kHz (with Mullard CV2492 goldpin) Freq range: (-3dB 120 Ohm load) 1.5Hz - 190kHz (with Mullard CV2492 goldpin) Very nice 10kHz squarewave reproduction, no overshoot or ringing. The frequency range has been measured WITH the input cap present. THD @ -3dB FS < 0.6% (2nd harmonic -45dB, 3rd harmonic -40dB) THD @ -10dB FS < 0.15% (2nd harmonic -55dB, 3rd harmonic -68dB) THD @ -20dB FS < 0.04% (2nd harmonic -70dB, 3rd harmonic -98dB) Because this amp has such a huge dynamic range/output voltage will (normally) not exceed the -20dB border. Typical fast sloping harmonic distortion typical to tubes. S/N > 120dB (from 0 dB FS reference) Slew rate: positive 12V/us, negative 20V/us output power on 0.2 Ohm output: Warning: This amp can seriously damage and blow up headphones in this setting16 Ohm = 700 mW (0.7W) 32 Ohm = 1300 mW (1.3W) 64 Ohm = 2700 mW (2.7W) 120 Ohm = 1800mW (1.8W) 300 Ohm = 800 mW (0.8W) 600 Ohm = 400 mW (0.4W) output power on 120 Ohm output: 16 Ohm = 200 mW 32 Ohm = 350 mW 64 Ohm = 460 mW 120 Ohm = 500 mW 300 Ohm = 420 mW 600 Ohm = 300 mW Huge dynamic range and no audible noise in headphones. For those who do not care about specs... Sounds excellent and goes incredidibly loud without breaking a sweat or hints of distortion ! Pitchblack background. a schematic can be found in the usual place known to insiders or on request.
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Post by Garage1217 on Nov 28, 2011 15:35:25 GMT
That is some serious power!
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joethearachnid
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Old head on young shoulders.
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Post by joethearachnid on Nov 28, 2011 18:41:01 GMT
It's okay, it's fine. I just have to pretend I never saw this post.
There is no post here. It's my imagination. Good thing there isn't another amp I want to build, eh?
-JoetheArachnid
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Deleted
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Post by Deleted on Dec 27, 2011 9:41:56 GMT
Finally I got time for the metalwork to finish the project.
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Post by Deleted on Dec 27, 2011 10:46:26 GMT
And the most importaant part of the specs, the price(s)?? Dave.
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Post by Deleted on Dec 27, 2011 12:11:17 GMT
The spin-off from this project (it was built on a Sunrise PCB) will become available in due time. Therefore the price is yet unknown. Currently Jeremy and I are working on a 'high output power' version of the Sunrise (single ended class-A). When this is finished jeremy will probably start on the spin-off from this one (high voltage/curent opamp output stage) Looks will not be the same as this one is made in the style all my equipment is made, a one off. In car analogies a concept car.
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jonclancy
Been here a while!
Mr. Ripple Eater
Amateur EAGLEist
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Post by jonclancy on Dec 27, 2011 13:20:21 GMT
Blimey, you've both been busy!!!
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Post by Garage1217 on Dec 28, 2011 22:03:23 GMT
Very busy... Sooo tired... Cannot get away from the pc so might as well be one with it
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Post by davefo on Jan 4, 2012 20:15:46 GMT
The spin-off from this project (it was built on a Sunrise PCB) will become available in due time. Therefore the price is yet unknown. Currently Jeremy and I are working on a 'high output power' version of the Sunrise (single ended class-A). When this is finished jeremy will probably start on the spin-off from this one (high voltage/curent opamp output stage) Looks will not be the same as this one is made in the style all my equipment is made, a one off. In car analogies a concept car. I've been looking to enclose my sunrise amp. please can you send me links for this project schematic and components list etc. Thanks Dave
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Deleted
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Post by Deleted on Jan 5, 2012 12:58:25 GMT
The schematic of THIS particular build is here: rockgrotto.proboards.com/index.cgi?board=friends2&action=display&thread=6387&page=1OPA-88 It has little to do with the original sunrise anymore except I (mis)used a prototype PCB for some of the parts. There is no BOM list or PCB (yet) In due time a derivative that will perform equally well (or even better) will be available through Jeremy. The used cabinet is already 25 years old (had a bunch of different sizes lying around) I don't think it's available anymore. Lots of metal cases around though. When encasing the Sunrise take care of enough facilties for cooling the class-A stage. This design is not class A and only the tube gets warm, hence the closed enclosure.
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Post by floriangerard51 on Mar 12, 2012 0:43:21 GMT
how does it sound compared to the typical 12AU7 design?
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Deleted
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Post by Deleted on Mar 12, 2012 15:59:13 GMT
POWERfull.
It can also take 12AU7 but it works optimal with 6922/ECC88/6DJ8 The 12AU7 has an audible noise floor on high efficiency headphones, not with the other tubes. This is because of the physical construction of these tubes (they need a higher voltage for better S/N ratio)
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Post by floriangerard51 on Mar 12, 2012 17:58:13 GMT
should i test to build this one to compare with my BRAVO V2 or better goes on the building of your next HORIZON?
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Post by Deleted on Mar 12, 2012 19:08:55 GMT
The Horizon is a higher voltage single ended class-A.
a PCB for this design will also become available in about 6 months or so. Hasting a development like this isn't proper engineering. It is MUCH more powerfull than the Horizon and any other 24V fed tube amp out there . It is not class-A (thus NO heat) and also has autobias. a completely different design than the single ended class-A amps. The single ended class-A output stages have relative high amounts of distortion compared to this design as the output stage has local feedback.
Which one someone might prefer depends on audio religion.
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Deleted
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Post by Deleted on Mar 17, 2012 15:31:09 GMT
Jeremy, are you going to do what you did with the Sunrise - prebuilt or build it yourself options? Also, do you have any idea yet of costs? Looks brilliant.
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Post by Garage1217 on Mar 18, 2012 22:51:16 GMT
Hey Ian, Sorry did not see this. That is the plan when the time comes No ideas on cost but in theory it should be around the price of Sunrise II. I think you should hear the Sunrise II out of the box and the Horizon when it is ready.
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Deleted
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Post by Deleted on Mar 18, 2012 23:03:04 GMT
If it is, then it'll be fantastic value Jeremy. My Sunrise gets a lot of use and it's been a great little amp.
You must be nearing the end of Sunrise 1 kits now?
The hybrid looks particularly attractive with the power it will have and output impedance alterations.
I borrowed Fran's little impedance adapter and that was an education in how different headphones react to impedance changes.
Look forward towards the Horizon!!! ;-)
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Post by Garage1217 on Mar 18, 2012 23:35:58 GMT
If it is, then it'll be fantastic value Jeremy. My Sunrise gets a lot of use and it's been a great little amp. You must be nearing the end of Sunrise 1 kits now? The hybrid looks particularly attractive with the power it will have and output impedance alterations. I borrowed Fran's little impedance adapter and that was an education in how different headphones react to impedance changes. Look forward towards the Horizon!!! ;-) Hey Ian, The Sunrise I has been discontinued since January. Since then, only Sunrise II has been shipping. Horizon is the higher power, into higher impedance single ended class A version of Sunrise II which runs at 48V vs 24V. The one in this post will end up being "Project Ember"
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Deleted
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Post by Deleted on Jun 20, 2012 16:16:52 GMT
I got a bit tired of having to open up the amp if I wanted to change from 6V to 12V tube. It set's the bias automatically so it would be easiest if the heater selection/setting was automatic too instead of a jumper inside or even a switch on the back. So I added a circuit that does just that. More versatile ... just pop in any dual triode and go...
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Post by Deleted on Jun 20, 2012 20:22:28 GMT
Frans, you have to stop doing this stuff!!!!! This is going to need a serious power supply and I imagine it will have the kick of a mule should you touch anything naughty. Anything bigger for headphones and the local towns' lights will start dimming on the peaks.
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layums
100+
Thank you for the untips
Just started electrical fixing, to go with my other fixing bad habits :)
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Post by layums on Sept 15, 2012 9:39:22 GMT
This amp does look awesome. Would love to hear it and compare with my existing v2 and sunrise ii which on its way. technically it's in another league, so I'm curious how it sounds.
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Post by whiteghost on Oct 20, 2012 11:08:15 GMT
i'm waiting for a commercial version of this amp, it will be my next buy to jeremy... Autobias and autovoltage-heater features are terrific ! and it's very powerfull, it will be the next Killer-amp
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