That is an evaluation and step-by-step dimensions associated with the Schiit Saga passive/tube pre-amplifier.

That is an evaluation and step-by-step dimensions associated with the Schiit Saga passive/tube pre-amplifier.

it’s on sort loan from a member who has got waiting literally months for their review! The Saga costs USD $349 from Schiit direct with stock shipping plus tube. The tube provided with this product had been the Russian 68HC which can be their clone of 6N8S (dural triode).

The design that is industrial typical of Schiit item but as always, with an alternate switch system and appears:

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For reasons too embarrassing to describe, I experienced to start the machine and here, we noticed the analog amount control (which gets changed into electronic), had a notch that is nice it. I became pleased these were utilizing such as that could prevent the amount control becoming loose, and then recognize the set screw continues on the circular area of the shaft, not flat!

Anyhow, back once again to the switches, the are microprocessor controlled and feel good. Click on the input one in the left and you also turn between five various RCA inputs. The turn on the proper chooses whether or not the Saga is a straightforward pass-through with volume control, or with a hybrid that is active state production stage pre-amplifier. The gain both in situations is zero meaning whatever voltage you put in, is really what you can get away.

The quantity control is a stepped attenuator making use of a handful of relays and resistors. Comparable pair of relays are acclimatized to find the right input.

Let us enter into measurements and view just just exactly how each mode executes.

Dimensions This being fully a tube amplifier, we thought I measure I measure its performance in active mode because it driven on to observe how it changes:

While you see, performance is quite stable. There was a really small enhancement in one channel as much as about one minute but from then on, there is absolutely no distinction also only at that magnification. This is an excellent thing than you have to as you don’t want to age the tubes any more.

I’m frequently high in complaints about fables audiophiles think it. In cases like this, the above busted certainly one of my own fables that pipe items need significant warm up to get at stable performance. @SIY had told me personally otherwise but needless to say, I didn’t pay attention.

With this from the method, let us have a look at our typical dashboard. To essentially judge the performance regarding the Schiit Saga in passive mode, we thought we show the performance that is native of sound Precision APx555 on it’s own before routing the production through the Saga:

We come across the tiniest quantity of distortion at 2 kHz (degree at -150 dB) and mains sound (level https://datingmentor.org/ at -145 dB).

There is certainly some sound around our main sign dress. I will be rid of that utilizing the electronic (DAC) mode associated with the APx555 generator then again distortion increases. Anyway, a SINAD is had by us of 122 dB as of this 2 volt output.

Routing the sign through Schiit Saga at maximum amount in passive mode we get:

There was some mains leakage which may be because of ground cycle or leakage associated with power when it comes to active phase in Saga. In either case, this really is excellent performance with just 2 to 3 dB of loss in comparison to APx555.

I became securing to my seat expect massive fall in performance once I started up the pipe:

Wow, that is really respectable! We have calculated Schiit DACs with far reduced performance. The offending distortion may be the harmonic that is second nearly -98 dB which sets the SINAD/THD+N. Additionally power associated surges however they are at -108 dB and lower so do not come right into play.

Overall, it is one good showing up to now!

Let’s measure regularity reaction at maximum amount:

The pass-through mode (in blue) is ruler flat, showing the superlative performance associated with the APx555.

We went the stage that is active means: 1) with standard 100k Ohm input impedance associated with the analyzer (green) and 2) 600 Ohm load regarding the analyzer. We come across that there surely is some droop with 100k Ohm load beginning at 50 Hz and increasing to 2 dB at 10 Hz. This means that a capacitor production phase which will have increasingly higher naturally impedance as frequencies decrease. Switching to 600 Ohm load emphasizes this and magnifies the issue significantly and artificially, offering us 16 dB of droop by 20 Hz.

The 600 Ohm impedance is basically the inverted form of our output impedance bend but let’s run the complete dimension to have the certain values:

Searching all of the option to the proper, the minimum impedance is 183 ohm. During the entry level of 20 Hz, impedance climbs to 3,130 ohm. Utilizing the typical 10:1 rule, your energy amplifier input impedance must certanly be at the least Ohm that is 30k to regularity dependent/EQ modifications. Place more just, by using reduced input impedance energy amplifier after Saga in active mode, your frequencies that are low 500 Hz or more will attenuate. This might accentuate all of those other range you may like, or perhaps not.

The passive mode has a unique problems right right here. So far on function the volume has been kept by me at maximum as to help keep the attenuator resistors off the beaten track. The minute you turn straight down the amount, you will end up placing amount that is varying of in the production course and therefore, increase impedance. This is actually the production impedance bend in passive mode with amount around 20percent:

The cursor reaches 144 Hz showing an impedance of 2,760 ohm. This is certainly contrary to simply 21 ohm impedance at maximum amount showing the 20 ohm production impedance of this APx555 analyzer.

Plotting a points that are few the amount control gets us this:

So basically, any amount level lower than 50% will probably boost the impedance significantly. Happily the attenuation just isn’t frequency dependent therefore the impact isn’t there as there is certainly with pipe phase. Nevertheless in the event that input impedance regarding the energy amp modifications with regularity and is not as much as 30k Ohm, then switching down the amount may replace the regularity reaction. Perfection in noise and distortion has this cost.

Conclusions i need to state, we create a fondness with this small pre-amp. We have no concept why it myself as I would never use. It simply may seem like a neat mixture of features in quite a cost package that is low. If you should be to locate its features and generally are mindful of disadvantages with regards to its varying production impedance, however do not experience a explanation not to get and fool around with it. You could utilize it as a nicely implemented switcher that is audio instance with all the amount control for fine tuning of maximum level.

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