This is certainly an evaluation and step-by-step measurements associated with Schiit Saga passive/tube pre-amplifier.

This is certainly an evaluation and step-by-step measurements associated with Schiit Saga passive/tube pre-amplifier.

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

The design that is industrial typical of Schiit product but as always, with yet another switch procedure and appears:

For reasons too embarrassing to explain, I’d to start the system and here, we noticed the analog amount control (which gets converted to electronic), possessed a notch that is nice it. I happened to be pleased they certainly were utilizing such as that could steer clear of the amount control becoming loose, simply to understand the set screw continues on the part that is round of shaft, perhaps maybe not flat!

Anyhow, back once again to the switches, the are microprocessor controlled and feel good. Click on the input one regarding the left and also you turn between five different RCA inputs. The turn on the proper 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 in both situations is zero meaning whatever voltage you place in, is exactly what you can get away.

The amount control is really a stepped attenuator utilizing a number of relays and resistors. Comparable pair of relays are acclimatized to find the right input.

Let us enter into dimensions and find out just how each mode executes.

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

While you see, performance is quite stable. There clearly was a rather improvement that is slight one channel as much as about a moment but from then on, there’s no distinction even only at that magnification. This is an excellent thing as you do not want to age the pipes any longer than you need to.

I will be often packed with complaints about myths audiophiles think it. In this instance, the above busted certainly one of my personal myths that pipe items need significant heat up to get at stable performance. @SIY had told me otherwise but needless to say, I didn’t listen.

With this from the means, why don’t we have a look at our typical dashboard. To essentially judge the performance of this Schiit Saga in passive mode, we thought we show the indigenous performance regarding the 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 (degree at -145 dB).

There was some sound around our main sign dress. I am able to dispose of that using the electronic (DAC) mode for the APx555 generator then again distortion increases. Anyhow, we’ve a SINAD of 122 dB only at that 2 volt production.

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

There is certainly some mains leakage that could be as a result of ground loop or leakage for the power supply for the stage that is active Saga. In either case, this might be performance that is Green dating service exemplary simply 2 to 3 dB of loss when compared with APx555.

I became waiting on hold to my seat anticipate massive fall in performance once I started up the pipe:

Wow, this really is really respectable! We have measured 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. 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 maximum amount:

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

We ran the stage that is active methods: 1) with standard 100k Ohm input impedance for the analyzer (green) and 2) 600 Ohm load of this analyzer. We come across there is some droop with 100k Ohm load beginning at 50 Hz and increasing to 2 dB at 10 Hz. This indicates 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 essentially the inverted form of our production impedance bend but let us run the measurement that is full have the certain values:

Searching most of the real 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 guideline, your energy amplifier input impedance ought to be at the least 30k Ohm in order to avoid regularity dependent/EQ modifications. Place more just, if you are using reduced input impedance energy amplifier after Saga in active mode, your frequencies that are low 500 Hz or more will attenuate. This could accentuate the remainder range you might like, or otherwise not.

The passive mode has a unique problems right right here. As yet on purpose the volume has been kept by me at max as to help keep the attenuator resistors straightened out. The minute you turn along the amount, you’ll be putting amount that is varying of in the production course and thus, increase impedance. This is actually the production impedance bend in passive mode with amount around 20percent:

The cursor has reached 144 Hz showing an impedance of 2,760 ohm. This can be in comparison to simply 21 ohm impedance at maximum amount showing the 20 ohm production impedance regarding the APx555 analyzer.

Plotting a couple of points on the quantity control gets us this:

So basically, any amount degree significantly less than 50% will probably raise the impedance considerably. Happily the attenuation isn’t frequency dependent and so the effect just isn’t there as there is certainly with pipe phase. Nonetheless in the event that input impedance associated with the energy amp modifications with frequency and is not as much as 30k Ohm, then switching along the amount may replace the regularity reaction. Perfection in noise and distortion has this cost.

Conclusions i have to state, a fondness was developed by me because of this small pre-amp. I have no concept why when I would not put it to use myself. It simply may seem like a neat mixture of features in a fairly cost package that is low. 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. Make use of it as a nicely implemented sound switcher for instance with all the amount control for fine tuning of maximum level.

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