This really is a performance test for the Schiit Saga pre-amplifier utilizing two various pipes.

This really is a performance test for the Schiit Saga pre-amplifier utilizing two various pipes.

The system and additional pipes are on loan from type member. Look at writeup 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 supplied is from Raytheon and ended up being built in United States Of America. They can be seen by you side-by-side here:

The 68HC is regarding the left in addition to Raytheon 6SN7 is from the right.

The pins on try this out 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 dimensions of 68HC. I simply went some of the tests on 6SN7. Generally there be some variation in performance regarding the product general but ideally that is lost within the sound, pun intended.

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

Dimensions just like the review, we started my screening 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 really has greater distortion! We shall quantify that soon.

In the good part performance is apparently more stable with less deviation within the graph. Not too this matters much given the variations that are tiny macro degree.

Throughout the dimension we recognized my Light-emitting Diode light ended up being on. It had been about a base over the Schiit Saga. I change it down during dimensions but have never noticed it making a positive change prior to. Right right Here it did, causing one channel to obtain a little even even worse nevertheless the other a bit better! Once again, they are very small variants of no effect but shows just how good our instrumentation is, together with known proven fact that some disturbance is stepping into the system, maybe coupling into the pipe it self.

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

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

We destroyed nearly 4 dB within one channel, and 2 dB within the other. This can be noticeable within the harmonic that is second peaks greater with all the Raytheon 6SN7.

Conclusions they state do not judge guide by its address and that’s real right right here. The so named „clone” tube did much better than the brand Raytheon. Needless to say difficult to tell just how much this correlates with a much bigger test of tubes. 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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Truth be told. I assume this demonstrates tube rolling might have a result, however it really helps to have an AP readily available to assess the huge difference.

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

Dependent on Fun and Learning
Significant Contributor

Cheapest distortion 6SN7 type i have tested ended up being a CV1988.

Nevertheless, there is definitely better options for cathode supporters- the numbers of merit are mu and transconductance, and 6SN7 is kind of center associated with the road there. Its merit that is main is in a position to move averagely big voltages, that will be certainly not appropriate in this application. High gm triodes like 6DJ8/6922 will outperform a 6SN7 in this ongoing solution, but are unfortunately not pin compatible. We suspect the 6SN7 had been opted for for any other than technical reasons.


Active Member

We’ll chime for the reason that I always comprehended „added sound” from a pipe become one thing „ideal” for a few people. Due to the fact 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 add distortion over a „cleaner” sounding tube

I am not merely one that enjoys. added sound beyond whats inherent to performance that is high thus I would definitely 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 added but less distortion that is varied of Raytheon might be exactly just what some individuals want within their system,

I might additionally advise that when your buying [and evaluation] pipes your buying 100%/100% models, when I’ve discovered subjectively tubes run alone in a twin triode setup [so an individual 6SN7] that have a variation regarding the production values for every single triode often provide a less exact stereo image and are alson’t as resolving often times. That 2dB SINAD reading distinction is most likely reflective of „somewhat different” production values for every single triode. Or it further reflects that production from both triodes in the tube is not a perfect match. The stock pipes production is more in accordance with the thing I’d desire from the pipe in my very very own system that is own’s maybe not positively 100% but near sufficient because it is such as for instance a 99.7% match. VS one other which will be around 98.4 and that little difference correlates up to a 2DB SINAD huge difference that we’m yes because of it self is not audible but had been planning to amplify that single which will likely further enhance the „difference” fundamentally ensuing tiny small undesired modifications

An we’ll further add that bother about these kinds of differences just legitimate in hybrid systems making use of just one twin Channel Triode pipe, and it is feasible each of mentioned is complete and utter bull schiit, since again i am no expect with this is solely speculation considering my subjective experience.