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This is certainly a performance test regarding the Schiit Saga pre-amplifier utilizing two tubes that are different.

This is certainly a performance test regarding the Schiit Saga pre-amplifier utilizing two tubes that are different.

The system and additional pipes are on loan from type user. Look at post on Schiit Saga in parallel thread.<

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When I talked about into the report on Saga, the stock tube is really a Russian made clone of 6NS7 which passes label of 68HC. The additional pipe supplied is from Raytheon and had been manufactured in United States Of America. You can view them side-by-side here:

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

The pins on the 68HC had some oxidation 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 of this product general but ideally this is certainly lost into the sound, pun intended.

Let us enter measurements to see if our western, genuine 6SN7 provides on its vow.

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

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

From the good part performance appears to be more stable with less deviation within the graph. Not too this matters much given the small variants at macro degree.

Through the dimension we understood my light that is LED was. It absolutely was of a base over the Schiit Saga. I switch it off during dimensions but never have noticed it making a positive change prior to. Here it did, causing one channel to have a bit even worse however the other a bit better! Once again, they are very small variants of no effect but shows exactly exactly just how good our instrumentation is, while the undeniable fact that some disturbance is engaging in the machine, possibly coupling towards the pipe it self.

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

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

We destroyed almost 4 dB in a single channel, and 2 dB within the other. This is certainly noticeable when you look at the 2nd harmonic which peaks greater because of the Raytheon 6SN7.

Conclusions they state don’t judge guide by its address which is real right here. The so named “clone” tube did much better than the manufacturer Raytheon. Needless to say difficult to tell just how much this correlates with a much bigger test of pipes. For the time being however, the dimensions reveal one step backward so my suggestion towards the owner would be to keep consitently the tube that is russian offer the Raytheon.

Ron Texas

Significant Contributor

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In all honesty. I assume this shows tube rolling might have a result, nonetheless it helps you to have an AP readily available to gauge the distinction.

Meanwhile, each and every time we 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 ended up being a CV1988.

Nevertheless, there is far better options for cathode supporters- the numbers of merit are mu and transconductance, and 6SN7 is kind of center regarding the road there. Its merit that is main is in a position to move mildly big voltages, that will be certainly not relevant 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 plumped for for any other than technical reasons.


Active Member

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

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

I am not one that enjoys. added sound beyond whats inherent to high end pipes and so I would likely 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 bad thing. The additional but less distortion that is varied of Raytheon can be just what many people want inside their system,

I would personally additionally advise that when your buying [and evaluating] 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 provide a less exact stereo image as they aren’t as resolving often times. That 2dB SINAD reading difference is most likely reflective of “slightly different” production values for every single triode. Or it further reflects that production from both triodes inside the tube is not a fantastic match. The stock pipes production is much more in accordance with the thing I’d wish from the pipe within my own system, it’s maybe not definitely 100% but near sufficient since it’s just like a 99.7% match. VS one other which will be around 98.4 and therefore tiny difference correlates up to a 2DB SINAD huge difference that we’m certain because of it self is not audible but had been going to amplify that single which will likely further add to the “difference” eventually ensuing tiny minor undesired modifications

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

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