This might be an evaluation and step-by-step dimensions associated with Schiit Saga passive/tube pre-amplifier.

This might be an evaluation and step-by-step dimensions associated with Schiit Saga passive/tube pre-amplifier.

it really is on type loan from a user who may have waiting literally months for their review! The Saga costs USD $349 from Schiit direct with stock tube plus delivery. The tube provided with this product had been the Russian 68HC which can be their clone of 6N8S (dural triode).

The industrial design is typical of Schiit item but as usual, with an alternate switch device and looks:

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For reasons too embarrassing to describe, I experienced to open up the machine and there, we noticed the analog amount control (which gets changed into electronic), had a notch that is nice it. I became pleased these were making use of such as that will steer clear of the volume control becoming loose, simply to recognize the set screw continues on the circular area of the shaft, maybe not flat!

Anyhow, returning to the switches, the are microprocessor controlled and feel good. Click on the input one from the left and also you 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 with an energetic hybrid tube+solid state production stage pre-amplifier. The gain both in situations is zero meaning whatever voltage you invest, is really what you can get away.

The quantity control is really an attenuator that is stepped a number of relays and resistors. Comparable collection of relays are accustomed to find the right input.

Let us go into dimensions to see just exactly exactly how each mode executes.

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

While you see, performance is quite stable. There clearly was a tremendously improvement that is slight one channel as much as about one minute but from then on, there’s absolutely no huge difference also only at that magnification. This is an excellent thing while you do not desire to age the pipes any longer than you need to.

I will be frequently high in complaints about urban myths audiophiles think it. In cases like this, the above busted certainly one of my very own urban myths that pipe services and products need significant heat 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 real means, let us have a look at our typical dashboard. To essentially judge the performance for 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 output 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 was some sound around our signal that is main skirt. I am able to be rid of that using the electronic (DAC) mode for the APx555 generator then again distortion increases. Anyhow, a SINAD is had by us of 122 dB as of this 2 volt production.

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

There is certainly some mains leakage that could be because of ground cycle or leakage associated with the power supply for the active phase in Saga. Either way, this really is performance that is exemplary simply 2 to 3 dB of loss when compared with APx555.

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

Wow, this is certainly extremely respectable! We have calculated Schiit DACs with far reduced performance. The offending distortion could be the 2nd harmonic at nearly -98 dB which sets the SINAD/THD+N. Additionally, 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 reaction at maximum amount:

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

We ran the active phase two methods: 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 starting at 50 Hz and increasing to 2 dB at 10 Hz. This suggests a capacitor output phase which may 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 let us run the measurement that is full obtain the certain values:

Searching all 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. Utilising the typical 10:1 guideline, your energy amplifier input impedance ought to be at the very least Ohm that is 30k to regularity dependent/EQ changes. 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 could accentuate all of those other range you might like, or perhaps not.

The passive mode has its very own problems right right here. So far on purpose the volume has been kept by me at maximum as to help keep the attenuator resistors straightened out. As soon as you turn straight down the amount, you will end up placing 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 reaches 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 output impedance associated with APx555 analyzer.

Plotting several points on the quantity control gets us this:

So basically, any amount degree lower than 50% will probably raise the impedance significantly. Happily the attenuation is certainly not frequency dependent therefore the effect 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 significantly less than 30k Ohm, then switching straight down the amount may replace the regularity reaction. Perfection in distortion and noise has this cost.

Conclusions i have to state, a fondness was developed by me with this small pre-amp. I’ve no clue why it myself as I look at this now would never use. 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 switcher that is audio instance using the amount control for fine tuning of maximum level.

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