This will be a performance test regarding the Schiit Saga pre-amplifier utilizing two various pipes.

The machine and tubes that are extra on loan from type user. Look at report on 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 provided is from Raytheon and had been produced in United States Of America. 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 the 68HC had some oxidation on them. In comparison the pins in the Raytheon 6SN7 were pretty clean.

I didn’t duplicate the measurements of 68HC. I simply went some of the tests on 6SN7. Generally there be some variation in performance regarding the device general but hopefully that is lost into the sound, pun intended.

Let us go into dimensions to see if our western, genuine 6SN7 provides on its vow.

Dimensions just like the review, we began my assessment by calculating performance stability that is warm-up

The most effective two lines come from Raytheon 6SN together with bottom two with 68HC. We come across that the Raytheon pipe actually has greater distortion! We shall quantify that soon.

Regarding the side that is positive is apparently more stable with less deviation into the graph. Not too this matters much given the variations that are tiny macro degree.

Throughout the dimension I recognized my light that is LED was. It had been in regards to a base over the Schiit Saga. I transform it down during dimensions but never have noticed it making a positive change before. 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 variants of no effect but shows exactly exactly exactly how good our instrumentation is, together with known undeniable fact that some interference is stepping into the system, possibly coupling into the tube it self.

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

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

We destroyed very nearly 4 dB in one single channel, and 2 dB when you look at the other. This might be noticeable into the harmonic that is second peaks greater because of the Raytheon 6SN7.

Conclusions they do say do not judge guide by its address which is real right right here. The so called “clone” tube did much better than the brand Raytheon. Needless to say hard to tell just how much this correlates with a bigger sample of pipes. For the time being however, the dimensions reveal one step backward so my suggestion to your owner will be keep carefully the Russian pipe and offer the Raytheon.

Ron Texas

Significant Contributor

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

Meanwhile, each and every time we see “tube rolling” we think about a vehicle internal pipe rolling down a hill up to a river.

Dependent on Fun and Learning
Significant Contributor

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

However, there is definitely better alternatives for cathode supporters- the numbers of merit are mu and transconductance, and 6SN7 is kind of center for the road there. Its merit that is main is in a position to move mildly big voltages, which can be not necessarily appropriate in this application. High gm triodes like 6DJ8/6922 will outperform a 6SN7 in this solution, but 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 understood “added sound” from the pipe become one thing “ideal” for a lot of. Since the noise 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 tubes and so I would likely suggest the stock. In addition occur to like “russian” pipes my self anyways. My point being, that in my opinion in Tube Land included noise/distortion is not constantly a bad thing. The additional but less distortion that is varied of Raytheon can be exactly exactly what some individuals want inside their system,

I would personally additionally advise that when your buying [and assessment] 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 regarding the output values for every single triode often present a less exact stereo image and therefore aren’t as resolving often times. That 2dB SINAD reading distinction is most likely reflective of “somewhat different” production values triode. Or it further reflects that production from both triodes inside the pipe isn’t a match that is perfect. The stock pipes production is more consistent with the thing I’d wish from the pipe in my own own system, it’s perhaps not positively 100% but close sufficient because it is such as for instance a 99.7% match. VS one other that will be around 98.4 and that little difference correlates up to a 2DB SINAD distinction that we’m certain because of it self is not audible but had been likely to amplify that single which will likely further add to the “difference” finally ensuing little small undesired modifications

An we’ll further add that bother about most of these distinctions is generally just legitimate in hybrid systems utilizing an individual twin Channel Triode pipe, feasible most of mentioned is complete and utter bull schiit, since again i am no expect of this is solely conjecture centered on my subjective experience.