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

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

The system and tubes that are extra on loan from sort member. Look at post on Schiit Saga in synchronous thread.<

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When I pointed out into the summary of Saga, the stock pipe is really a Russian made clone of 6NS7 which passes label of 68HC. The additional pipe supplied is from Raytheon and had been built in United States Of America. You can see them side-by-side here:

The 68HC is regarding the left as well as the Raytheon 6SN7 is from the right.

The pins on the 68HC had some oxidation on them. On the other hand the pins on the Raytheon 6SN7 were pretty clean.

I didn’t duplicate the measurements of 68HC. I simply ran a number of the tests on 6SN7. Generally there be some variation in performance regarding the product overall but ideally that is lost within the sound, pun intended.

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

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

The most truly 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 will quantify that soon.

Regarding the good part performance appears to be more stable with less deviation into the graph. Not too this matters much given the variations that are tiny macro level.

Throughout the dimension we noticed my Light-emitting Diode light ended up being on. It absolutely was of a base over the Schiit Saga. I change it down during measurements but never have noticed it making a positive change prior to. Here it did, causing one channel to obtain a little even worse nevertheless the other a bit better! Once again, they are very small variants of no effect but shows just just how good our instrumentation is, therefore the proven fact that some disturbance is stepping into the machine, possibly coupling to your pipe it self. Before getting to the dashboard, this is how the stock 68HC did:

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

We destroyed nearly 4 dB in one single channel, and 2 dB when you look at the other. This might be noticeable within the 2nd harmonic which peaks greater aided by the Raytheon 6SN7.

Conclusions they do say don’t judge guide by its address which is real right here. The so named «clone» tube did a lot better than the manufacturer Raytheon. Needless to say difficult to tell just how much this correlates with a bigger test of tubes. For the time being however, the dimensions reveal a action backward so my recommendation 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 assume this demonstrates tube rolling might have a result, nonetheless it helps you to have an AP readily available to assess the distinction.

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

Hooked on Fun and Learning
Significant Contributor

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

Nevertheless, there is far better alternatives for cathode supporters- the numbers of merit are mu and transconductance, and 6SN7 is kind of middle of this road there. Its merit that is main is in a position to swing reasonably big voltages, that will be not 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 pipe become one thing «ideal» for a lot of. Due to the fact sound or distortion regarding the pipe is second 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 performance that is high therefore I would likely suggest the stock. We additionally occur to like «russian» pipes my self anyways. My point being, that I think in Tube Land included noise/distortion is not constantly a bad thing. The additional but less distortion that is varied of Raytheon are exactly what some individuals want inside their system,

I might 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 accurate stereo image and so aren’t as resolving at times. That 2dB SINAD reading difference is most likely reflective of «somewhat different» production values for every single 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 consistent with the things I’d desire from the pipe in my own own system, it’s perhaps not definitely 100% but near enough since it’s such as for instance a 99.7% match. VS one other which is around 98.4 and that difference that is small up to a 2DB SINAD distinction that I’m certain because of it self is not audible but had been going to amplify that single which will likely further enhance the «difference» fundamentally ensuing little minor undesirable modifications

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

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