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This is certainly an assessment and detailed dimensions regarding the Schiit Saga passive/tube pre-amplifier.

By on July 15, 2021
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This is certainly an assessment and detailed dimensions regarding the Schiit Saga passive/tube pre-amplifier.

it really is on sort loan from a member who may have 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 commercial design is typical of Schiit item but as always, with another type of switch procedure and appears:

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For reasons too embarrassing to spell out, I’d to open up the machine and here, I noticed the analog amount control (which gets changed into electronic), had a good notch on it. I became pleased they certainly were making use of such as that could prevent the amount control becoming loose, and then understand the set screw continues the part that is round of shaft, perhaps perhaps maybe not flat!

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

The volume control is really an attenuator that is stepped a small number of relays and resistors. Comparable collection of relays are widely used to find the right input.

Why don’t we enter into dimensions and view exactly just how each mode executes.

Dimensions This being truly a pipe amplifier, we thought I measure I measure its performance in active mode it changes: as it powered on to see how

While you see, performance is extremely stable. There was a extremely improvement that is slight one channel as much as about a moment but from then on, there is absolutely no difference also only at that magnification. This is an excellent thing while you wouldn’t like to age the pipes more than you must.

I will be frequently saturated in complaints about fables audiophiles think it. The above busted one of my own myths that tube products require significant warm up to get to stable performance in this case. @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 I 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 amount that is tiniest of distortion at 2 kHz (degree at -150 dB) and mains sound (degree at -145 dB).

There is certainly some sound around our primary sign dress. I will dispose of that utilizing the electronic (DAC) mode regarding the APx555 generator then again distortion increases. Anyway, a SINAD is had by us of 122 dB only at that 2 volt production.

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

There was some mains leakage that could be as a result of ground cycle or leakage for the power when it comes to active phase in Saga. In either case, this might be performance that is exemplary simply 2 to 3 date me tips dB of loss when compared with APx555.

I happened to be waiting on hold to my seat anticipate massive fall in performance once I switched on the pipe:

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

Overall, this will be one good showing up to now!

Let’s measure regularity response at max amount:

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

We went the active phase two means: 1) with standard 100k Ohm input impedance regarding 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 suggests 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, providing us 16 dB of droop by 20 Hz.

The 600 Ohm impedance is basically the inverted form of our production impedance bend but why don’t we run the complete dimension to obtain the particular values:

Searching most of the option to the best, the minimum impedance is 183 ohm. In the budget of 20 Hz, impedance climbs to 3,130 ohm. Utilising the typical 10:1 guideline, your energy amplifier input impedance must certanly be at the least 30k Ohm in order to avoid regularity dependent/EQ modifications. Place more just, if you utilize reduced input impedance power amplifier after Saga in active mode, your low frequencies below 500 Hz or more will attenuate. This might accentuate all of those other range you might like, or otherwise not.

The mode that is passive its very own issues right here. So far on function the volume has been kept by me at maximum as to help keep the attenuator resistors taken care of. The minute you turn along the volume, you’ll be placing varying number of opposition in the production course and therefore, increase impedance. This is actually the production impedance curve in passive mode with amount around 20percent:

The cursor are at 144 Hz showing an impedance of 2,760 ohm. This really is as opposed to simply 21 ohm impedance at maximum amount showing the 20 ohm production impedance regarding the APx555 analyzer.

Plotting several points on the quantity control gets us this:

So basically, any amount level significantly less than 50% will probably boost the impedance considerably. Happily the attenuation just isn’t frequency dependent therefore the effect is certainly not there as there clearly was with pipe stage. But in the event that input impedance of this energy amp modifications with regularity and is significantly less than 30k Ohm, then switching along the amount may replace the regularity reaction. Perfection in distortion and noise has this cost.

Conclusions i have to state, we create a fondness because of this small pre-amp. We have no clue why it myself as I would never use. It simply may seem like a neat mix of features in a fairly low priced package. Then i don’t see a reason to not get and play with it if you are looking for its features and are mindful of drawbacks with respect to its varying output impedance. 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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