As a simplification of the range name of our products, our “Doge Prima Donna” becomes DOGE 10 “PADC” which stands for Precision Autobias with Dual Class (A/AB).
Our customers who already own it, and us, consider it as the best-integrated amp on the market for its price. You might find some KT88 amps from China at $899, sometimes even $799, sometimes with good appearance, but none will offer such sound performance, such amount of features, and last but not least, such reliability. DOGE 10 compare with amps in the range of $2500 to $6500. It has been reviewed under ODM partnership at 6400€ with 5 stars in European magazines.
- Includes our PAB (Precision Auto-Bias)
- Includes our new DUAL CLASS mode a unique new feature to switch from a 100% Class A mode to a 100% class AB mode
- Includes our new FLS (Feedback Loop Selector)
- Includes our APM (Auto Protection Mode)
- Includes our new DTI (Dead Tube Indicator)
- Includes a sophisticated SOFT-START
DOGE 10 is a KT88 push-pull integrated amplifier, but it can be used with 6550 or KT120 tubes as well. It can’t use KT150 tubes. It can deliver up to 60W in class AB.
To sum-up the DOGE 10 design core idea, we wanted to put the best of our knowledge and the best components in it. As a practical example, for coupling capacitors we moved to the UK brand Claritycaps that we use on our multi-awarded DOGE 8 Clarity. Coupling capacitors are very important as the signal pass directly through it.
We are proud to introduce on the tube amps market a totally new technology, the DUAL CLASS Mode. This is an exclusive feature of DOGE you won’t find anywhere else. Believe it or not, you really can’t find anywhere else worldwide !! 😎
After the launch in 2011 of our patented Doge PAB autobias, our microprocessor is now able to manage different levels of voltage and anode current for the same amplifier. So with the DOGE 10 you will be able to choose between class A and class AB within the same amplifier.
What is really different with this DUAL CLASS, compared with what you can read elsewhere, this is that our class A is not what others call “floating class A”, described like between “class A between 0 to 10W and then class AB from 10W to 50W for example, as we read on competitors websites. Such descriptions are only for marketing. The true class A must have a very high anode current going through the tubes, whether you are at minimum power or maximum powers, from 0W to Pmax. That’s the reason in class A we have programmed our microprocessor to set the bias at the high value of 80mA to deliver a true class A with only 0.07% distortion, which is extremely low and extremely rare for a tube amp. To be able to supply this high current to the tubes, the PADC microprocessor changes the main power voltage and the bias settings. This process requires around 50 seconds. That’s the reason it is really two amps in one, as when you change of class, there is a deep change inside the amp.
As a concrete example, in class AB the KT88 tubes get a 520V anode tension, whereas in class A the KT88 tubes get a 470V anode tension, which is the reason the max power is limited at 30W in class A, but in the same time, it is the evidence it is a true class A and not a “marketing” class A as you see elsewhere. In class AB the anode current is lowered and the higher voltage allows us to deliver 60W per channel.
So whether you are listening alone an Opera or you are making a party with friends, you will still have the best sound according to your needs. You just need around 50 secondes between the change of classes, to let the microprocessor to re-adjust the bias and change the high voltage of the power transformer accordingly.
Now some of you might think “why not doing only class A if class A is a must?” Well, it is not that simple. Because, the class A on a push-pull will have less distortion but might sound slightly less warm. For some orchestral performance or live performance, depending on tastes and systems, sometimes the class AB might sound better. Finally, depending on your style of music and personal taste you might like one better and this one might not be the same for everyone. Among our existing customers, 50% use class A, 30% use class AB and 20% switch from time to time between the two classes.
What about the reliability of using a microprocessor in a tube amp? Since we launched our first generation of autobias in mid-2011, we never had any break-down of our microprocessor which is a very mature STT unit (ST Microelectronics-Thomson).
If you want to make a break before going further into technical explanations, you can watch Doge 10 in one of our customer system.
Any designer would have stopped here, but we still wanted more! So we created the FLS (Feedback Loop selector) function. Although you find now somewhere else, we were the first to do it. Almost all amplifiers have a negative feedback loop, which in two words means the amplifier re-inject a little part of the output signal into the input stage to make it more stable. In the 60’s this was considered as an improvement. But after some years have passed, many audiophiles were considering that strong “feedback loop” made the amplifiers too linear and lacking of soul. A small number of amplifiers use zero “feedback”, but this requires ultra-stable speakers and perfect matching with all components of a system. On our side, our point of view is we don’t know which speakers will be used with our DOGE 10, so we have preferred to do a design with a feedback loop, and to let the user the choice of the strength of this feedback loop.
We offer three choices, normal, medium, and low. Normal is what you find in all amplifiers on the market, whereas “low mode” is close to the zero feedback loop’s amps. This choice is to make after listening upon your taste, and “low” mode still keeps a little feedback to keep the amplifier stable. Audiophiles who love the zero feedback loop will be delighted with our low feedback mode.
About the construction quality, we have used a rigid and thick steel chassis. The transformer cover is also made of 3 sections where each transformer is magnetically shielded to each other. To supply the correct amount of power, we use a huge power transformer, and a “Pi filtering” with a huge choke of 1H/1A, with 500µF before and 500µF after the choke, so a total of 1,000µF !! You will have firm and incredible basses.
A big choke can have a cost similar to a transformer, in particular, if like us, you use Z10 core steel. We have chosen a well-established brand, Prima Luna and its high range (photo from 2014) the Dialogue One at $3,290. You can see the difference of size and construction quality. Their choke look more like our 12V transformer beside our choke (to manage the microprocessor) than a real quality choke. To avoid any trick we have circled the ALPS potentiometer to show we use the same scale on each photo as we share this same component. You can see on the third photo that some other brands use even smaller chokes like ($3 choke) on Jolida “Fusion” latest amp (Jolida is in process of renaming black Ice Audio) and most of the competitors don’t even have chokes. That doesn’t mean amps without choke have bad sound (we don’t make secret we don’t use on Doge 5, for example, to make it more affordable), that doesn’t mean amps with smaller choke have necessarily bad sound, as if just having a bigger choke would make a better amp, that would be easy to design a good tube amp just selecting the biggest choke. This said, we wanted to point out we really put very high quality and expensive components inside DOGE 10 and this smart design with high range components makes both together make an incredible sound! it is also visible on the scale with 30Kg !!
So you might find cheaper amps, but if you want the level of sound performance of Doge 10, you need to have a sophisticated power stage, and this has a cost. A “Pi filtering” like ours will provide super fast and super silent power to the main tubes.
For coupling capacitors, we have moved from German Wima to the same UK Claritycaps that we use on Doge 8 Clarity. Each of them cost $8. Again we tried to put the best, that’s the reason our DOGE 10 can’t be compared to the cheap Chinese productions. Please see below the internal version with clarity caps.
Compared to our first generation of autobias from 2011, we have put all the tubes LEDs on the front panel in order to make that the tube sockets area doesn’t look like a “Christmas tree”, and instead, we put a nice anodized aluminum plate. So everything can be controlled from the front panel.
The only backward move has been that we remove the built-in DAC as it was outdated and we preferred to put more money on coupling capacitors as explained above.
We offer as an option, a very sophisticated protection cage which holds with strong magnets (enough strength for kids’ hands) so the appearance is beautiful with no visible holes on the chassis and no screws on the grid.
And what about the sound? It is at the same time warm and neutral, ultra-dynamic. The bass are particular firms. You can listen during hours without feeling tired.
We have compared it to several amplifiers among the range $3,000 to $5,000 range and our DOGE 10 was always the one who delivered the best sound!
The tubes origin are for :
KT88 : Psvane Hifi Series
12AT7 and 12AX7 : Shuguang first grade with Doge additional QC
We are very satisfied by this tubes matching, so we don’t offer any upgrade. However if you wish to use your own tubes, we can supply the amp without tubes and we’ll remove the tubes price. Please mail us if you wish to do so.
Estimated retail price in U.S. shops: $2,490 (excluding VAT)
> Factory-direct price: $1,690 including delivery to your front door, Paypal or CC fees, and one year warranty served in your country.
From December 2017, we do the same prices worldwide except for Asia, Russia, Brazil, South-Africa, and small islands. Due to the cost of shipping fees included in the price displayed above, South-East Asia will be cheaper, while laters will have a higher price. Please mail us if you belong to these countries.
- Optional smart protection cage : $69
Please note that for safety reasons according to international air freight regulations, remote controllers are not supplied with batteries. We use AA type batteries.