It is a performance test associated with the Schiit Saga pre-amplifier using two tubes that are different.

It is a performance test associated with the Schiit Saga pre-amplifier using two tubes that are different.

The machine and tubes that are extra on loan from sort user. Look at overview of Schiit Saga in synchronous thread.<

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The stock tube is a Russian made clone of 6NS7 which goes by label of 68HC as i mentioned in the review of saga. The additional pipe supplied is from Raytheon and had been manufactured in USA. They can be seen by you side-by-side here:

The 68HC is in the left and also the Raytheon 6SN7 is in the right.

The pins on some oxidation was had by the 68HC on them. In comparison the pins regarding the Raytheon 6SN7 were pretty clean.

I did not duplicate the measurements of 68HC. I simply went a number of the tests on 6SN7. Generally there be some variation in performance of this product overall but hopefully that is lost when you look at the sound, pun intended.

Why don’t we enter into dimensions and find out if our western, genuine 6SN7 provides on its vow.

Dimensions much like the review, we began my evaluating by calculating warm-up performance stability:

The utmost effective two lines come from Raytheon 6SN together with bottom two with 68HC. We come across that the Raytheon tube really has higher distortion! We shall quantify that briefly.

In the side that is positive appears to be more stable with less deviation into the graph. Not too this matters much given the tiny variants at macro degree.

Throughout the dimension we understood my light that is LED was. It had been about a base over the Schiit Saga. I usually transform it off during dimensions but never have noticed it making a positive change prior to. right Here it did, causing one channel to obtain a bit even even even worse nevertheless the other a bit better! Once more, they are very small variations of no effect but shows exactly exactly how good our instrumentation is, while the undeniable fact that some disturbance is engaging in the machine, possibly coupling to your pipe itself.

Before getting in to the dashboard, this is how the stock 68HC did:

SINAD (signal over noise and distortion) is all about 97.5 dB. Here’s how the Raytheon pipe did:

We lost nearly 4 dB in a single channel, and 2 dB within the other. This is certainly noticeable into the 2nd harmonic which peaks greater aided by the Raytheon 6SN7.

Conclusions they state don’t judge a written guide by its address which is real right right here. The so named “clone” tube did a lot better than the name brand Raytheon. Needless to say hard to tell exactly how much this correlates with a much bigger test of pipes. For now however, the measurements reveal one step backward so my suggestion to your owner is always to keep carefully the tube that is russian offer the Raytheon.

Ron Texas

Significant Contributor

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In all honesty. I suppose this shows tube rolling can have a result, however it helps have an AP readily available to gauge the distinction.

Meanwhile, everytime I see “tube rolling” we think about a vehicle tube that is inner down a hill up to a river.

Dependent on Fun and Learning
Significant Contributor

Cheapest distortion 6SN7 type i have tested had been a CV1988.

Nevertheless, there is far better options for cathode followers- the numbers of merit are mu and transconductance, and 6SN7 is kind of middle associated with the road there. Its main merit has been in a position to move reasonably big voltages, which can be not necessarily appropriate in this application. High gm triodes like 6DJ8/6922 will outperform a 6SN7 in this ongoing solution, but they are unfortunately not pin appropriate. We suspect the 6SN7 had been selected for any other than technical reasons.


Active Member

We’ll chime for the reason that I always comprehended noise that is”added from the tube become one thing “ideal” for a few people. Because the sound or distortion associated with pipe is 2nd purchase harmonics that are “pleasant sounding”

Therefore if it’s equal included sound in each channel some may enjoy that incorporate distortion over a “cleaner” sounding tube

I am not merely one that enjoys. added sound beyond whats inherent to high end pipes therefore I would definitely suggest the stock. We additionally occur to like “russian” pipes my self anyways. My point being, that i really believe in Tube Land included noise/distortion is not constantly a thing that is bad. The additional but less distortion that is varied of Raytheon can be just just what some individuals want inside their system,

I might additionally advise that when your buying [and screening] pipes your buying 100%/100% models, when I’ve discovered subjectively tubes run alone in a triode that is dual [so an individual 6SN7] which have a variation from the production values for every triode often present a less exact stereo image as they aren’t as resolving often times. That 2dB SINAD reading distinction is likely reflective of “somewhat different” production values for every single triode. Or it further reflects that production from both triodes in the pipe is not a great match. The stock pipes production is much more in accordance with the thing I’d want from the tube in my system that is own’s perhaps not positively 100% but near sufficient since it is such as a 99.7% match. VS one other that will be around 98.4 and that little difference correlates up to a 2DB SINAD huge difference that I’m certain because of it self is not audible but had been planning to amplify that single which will likely further enhance the “difference” fundamentally ensuing little minor unwelcome changes

An we’ll further add that bother about most of these distinctions is normally just legitimate in hybrid systems using an individual twin Channel Triode pipe, and it is feasible every one of mentioned is complete and bull that is utter, as again i am no expect and all sorts of with this is solely conjecture centered on my subjective experience.