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

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

The system and tubes that are extra on loan from sort user. Begin to see the summary of Schiit Saga in synchronous thread.<

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When I talked about when you look at the writeup on Saga, the stock pipe is really a Russian made clone of 6NS7 which goes by label of 68HC. The additional tube supplied 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 from the left as well as the Raytheon 6SN7 is from 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 didn’t duplicate the dimensions of 68HC. I recently went some of the tests on 6SN7. Generally there be some variation in performance regarding the product general but ideally this is certainly lost into the sound, pun intended.

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

Dimensions much like the review, we started my screening by calculating warm-up performance security:

The most notable two lines are from Raytheon 6SN plus the bottom two with 68HC. We come across that the Raytheon pipe really has greater distortion! We shall quantify that briefly.

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

Through the measurement we recognized my light that is LED was. It had been in regards to a base over the Schiit Saga. I change it down during dimensions but have never noticed it making a positive change prior to. Here it did, causing one channel to obtain a little even worse however the other a bit better! Once again, they are very small variants of no effect but shows exactly just how good our instrumentation is, therefore the known undeniable fact that some disturbance is engaging in the machine, possibly coupling into the pipe it self.

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

SINAD (signal over distortion and sound) is approximately 97.5 dB. This is how the Raytheon pipe did:

We destroyed very nearly 4 dB in a single channel, and 2 dB into the other. That is noticeable within the 2nd harmonic which peaks greater with all the Raytheon 6SN7.

Conclusions they do say don’t judge guide by its address and that’s real right right right here. The so named “clone” tube did a lot better than the name brand Raytheon. Needless to say difficult to tell simply how much this correlates with a bigger test of pipes. For the time being however, the dimensions reveal one step backward so my suggestion to your owner would be 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 demonstrates tube rolling might have an impact, nonetheless it helps have an AP readily available to gauge the huge difference.

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

Hooked on Fun and Learning
Significant Contributor

Cheapest 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, that will be not necessarily appropriate in this application. High gm triodes like 6DJ8/6922 will outperform a 6SN7 in this ongoing solution, but are unfortunately not pin appropriate. We suspect the 6SN7 had been plumped for for other than technical reasons.


Active Member

We’ll chime for the reason that I always comprehended noise that is”added from a pipe become one thing “ideal” for a lot of. While the sound or distortion associated with tube 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 thus I would likely suggest the stock. In addition 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 bad thing. The additional but less diverse distortion regarding the Raytheon might be exactly what some individuals want within 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 double triode setup [so an individual 6SN7] which have a variation in the production values for every triode often provide a less exact stereo image and generally aren’t as resolving at times. That 2dB SINAD reading distinction is most likely reflective of “slightly different” output values for every triode. Or it further reflects that production from both triodes inside the pipe is not a match that is perfect. The stock pipes production is more in accordance with the things I’d desire from the pipe during my own system, it’s maybe not definitely 100% but near sufficient since it’s such as a 99.7% match. VS one other which will be around 98.4 and therefore little difference correlates up to a 2DB SINAD distinction that I’m yes because of it self is not audible but had been planning to amplify that single which will likely further enhance the “difference” eventually ensuing little minor unwelcome modifications

An we’ll further add that bother about these kinds of distinctions is normally just legitimate in hybrid systems utilizing an individual double Channel Triode pipe, feasible every one of mentioned is complete and utter bull schiit, since again i am no expect and all sorts of of the is solely conjecture centered on my subjective experience.

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