The machine and tubes that are extra on loan from sort member. Begin to see the writeup on Schiit Saga in synchronous thread.<
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. You can view them side-by-side here:
The 68HC is from the left and also the Raytheon 6SN7 is in the right.
The pins on the 68HC had some oxidation on them. In comparison the pins from the Raytheon 6SN7 were pretty clean.
I didn’t duplicate the dimensions of 68HC. I simply ran a number of the tests on 6SN7. Generally there be some variation in performance for the product general but ideally this is certainly lost within the sound, pun intended.
Why don’t we enter into dimensions to see if our western, genuine 6SN7 provides on its promise.
Dimensions much like the review, we started my screening by calculating warm-up performance security:
The utmost effective two lines come from Raytheon 6SN in addition to bottom two with 68HC. We come across that the Raytheon pipe really has greater distortion! We will quantify that soon.
From the side that is positive is apparently more stable with less deviation into the graph. Not too this matters much given the tiny variants at macro degree.
Through the dimension I knew my light that is LED was. It absolutely was in regards to a base over the Schiit Saga. I change it off during measurements but never have noticed it making a positive change prior to. right right Here it did, causing one channel to have a little even even worse nevertheless the other a bit better! Once more, they are very small variants of no effect but shows just just how good our instrumentation is, as well as the known undeniable fact that some interference is stepping into the system, maybe coupling into the pipe it self.
Before getting in to the dashboard, this is how the stock 68HC did:
SINAD (signal over distortion and sound) is approximately 97.5 dB. Here’s how the Raytheon tube did:
We lost very nearly 4 dB in one single channel, and 2 dB into the other. This will be noticeable when you look at the 2nd harmonic which peaks greater utilizing the Raytheon 6SN7.
Conclusions they do say do not judge a written 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 just how much this correlates with a much bigger test of pipes. For the time being however, the dimensions reveal a action backward so my suggestion to your owner is always to keep consitently the Russian pipe and offer the Raytheon.
In all honesty. I assume this demonstrates tube rolling might have useful source a result, however it helps you to have an AP readily available to gauge the distinction.
Meanwhile, each time we see « tube rolling » we think about a vehicle internal pipe rolling down a hill up to a river.
Hooked on Fun and Learning
Cheapest distortion 6SN7 type i have tested ended up being a CV1988.
Nevertheless, there’s far better options for cathode supporters- the numbers of merit are mu and transconductance, and 6SN7 is kind of center of this road there. Its merit that is main is in a position to swing mildly big voltages, which will be not necessarily relevant 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.
I’ll chime for the reason that I always understood noise that is »added from a pipe to be one thing « ideal » for a lot of. Given that sound or distortion of this tube 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 just one that enjoys. added sound beyond whats inherent to performance that is high and so I would likely recommend the stock. We additionally occur to like « russian » tubes my self anyways. My point being, that i really believe in Tube Land included noise/distortion is not constantly a thing that is bad. The additional but less distortion that is varied of Raytheon are exactly just what many people want within their system,
I would personally also 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 in the production values for every triode often provide a less exact stereo image and so aren’t as resolving often times. That 2dB SINAD reading distinction is most likely reflective of « somewhat different » production values for every triode. Or it further reflects that production from both triodes within the pipe is not a match that is perfect. The stock pipes production is more in line with the thing I’d desire from the pipe within my own system, it’s perhaps not positively 100% but near sufficient because it is such as for instance a 99.7% match. VS one other which can 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 » fundamentally ensuing little minor undesirable modifications
An I’ll further add that bother about these kinds of distinctions is normally just legitimate in hybrid systems making use of just one twin Channel Triode tube, and it’s really feasible most of mentioned is complete and bull that is utter, since again i am no expect of this is solely conjecture centered on my subjective experience.