This is certainly a performance test associated with the Schiit Saga pre-amplifier utilizing two various pipes.

This is certainly a performance test associated with the Schiit Saga pre-amplifier utilizing two various pipes.

The machine and tubes that are extra on loan from type member. Begin to see the breakdown of 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 had been built in United States Of America. They can be seen by you side-by-side here:

The 68HC is in the left plus the 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 a number of the tests on 6SN7. Generally there be some variation in performance for the device general but ideally this is certainly lost within the sound, pun intended.

Let us go into dimensions and discover if our western, genuine 6SN7 delivers on its vow.

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

The most notable two furfling sign in lines come from Raytheon 6SN together with bottom two with 68HC. We come across that the Raytheon pipe really has higher distortion! We will quantify that soon.

Regarding the side that is positive appears to be more stable with less deviation into 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 had been on. It absolutely was of a base over the Schiit Saga. I transform it down during dimensions but never have noticed it making a positive change prior to. Here it did, causing one channel to have a little even worse however the other a bit better! Once again, they are very small variants of no effect but shows exactly exactly how good our instrumentation is, as well as the proven fact that some disturbance is engaging in the system, possibly coupling towards the pipe it self.

Before getting in to the dashboard, here’s how the stock 68HC did:

SINAD (signal over noise and distortion) is approximately 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. That is noticeable when you look at the 2nd harmonic which peaks greater utilizing the Raytheon 6SN7.

Conclusions they state do not judge guide by its address and that’s real right here. The so named “clone” tube did a lot better than the 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 recommendation towards the owner would be to maintain the Russian pipe and offer the Raytheon.

Ron Texas

Major Contributor

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Truth be told. I assume this shows tube rolling might have a result, but 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 to a river.

Hooked on Fun and Learning
Significant Contributor

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

However, 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, which will be certainly not appropriate in this application. High gm triodes like 6DJ8/6922 will outperform a 6SN7 in this solution, but they are unfortunately not pin suitable. 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 a pipe become one thing “ideal” for a few people. Once the 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 add distortion over a “cleaner” sounding tube

I am not just one that enjoys. added noise beyond whats inherent to performance that is high thus 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 isn’t constantly a thing that is bad. The included but less distortion that is varied of Raytheon might be just exactly what some individuals 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 twin triode setup [so an individual 6SN7] which have a variation in the production values for every single triode often provide a less accurate stereo image consequently they aren’t as resolving often times. That 2dB SINAD reading difference is most likely reflective of “somewhat different” production values triode. Or it further reflects that production from both triodes inside the pipe is not an amazing match. The stock Tubes production is more in line with the things I’d wish from the pipe in my own own system, it’s maybe not positively 100% but near sufficient since it’s just like a 99.7% match. VS one other that is around 98.4 and therefore small difference correlates up to a 2DB SINAD distinction that we’m sure because of it self is not audible but had been going to amplify that single which will likely further enhance the “difference” fundamentally ensuing in a few little small undesired modifications

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

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