Shootout of Nos 6sn7 tubes

@shkong78 Have you contacted the ebay seller about the noise in your 1578s? 

One of mine has noise with no music playing, some crackling.  I can hear it from my listening position about 9 1/2 feet away.  It's not noticeable while listening to music unless there's a quiet section.  I love the overall sound and tone of the 1578s but don't think I can live with the noise.  I've switched the tubes from one channel to the other and the noise follows.

I contacted them about it and they replied with a question, which I have answered.  Waiting to see if they'll offer a replacement.

@big_greg


I do not hear noise from the tube bought from Ebay dealer after playing it for 20 hours.

I recommend you to play it more and see what happens.

Some people claimed to have had cured the problem with re soldering pins.

They said most Russian tubes have problem with noise.

https://www.head-fi.org/threads/the-reference-6sn7-thread.117677/page-120#post-15647922


But I am going to see what happens with more break in.


I like Russian tubes with excellent bass and nice value but some of them may need re soldering.

@shkong7One tube is as quiet as tubes get, the other is noisy.  

@big-greg

After playing 20 more hours, if you keep hearing noise, you can contact dealer about it.

Another choice is to do re soldering pins.

Some people in Headfi is of the opinion that it is better to do re soldering on Russian tubes.

I will also consider my options whether I will try to do re soldering myself or send my tubes to who can do better job than I.

I had gone through most of famous 6n7 except Telefuken and Sylvania wgt metal base ( I have Syl wgt brown base).

Now I am getting ideas of the pros and cons of each tube.

No tube is perfect.

1578 has rather closed in treble although its treble is pure and clean.

TS has no bass slam compared with Kenrad vr231 and Russian tubes.

So far my overall favorite is 6n8s made in 1953.

I do not claim that 6n8s sound better than 1578 or TS bgrp.


This 6n8s made in 53 goes midway between 1578 and TS.

Thus I enjoy this tube more than either 1578 or TS.


I placed just one more of 6sn7 tube.

Strong Matched Pair National Union 6SN7GT Black Glass Tubes Same 1951 Date
https://www.ebay.com/itm/Strong-Matched-Pair-National-Union-6SN7GT-Black-Glass-Tubes-Same-1951-Date/164063553459?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

It could be rebranded TS bgrp or maybe not.  

https://www.head-fi.org/threads/the-reference-6sn7-thread.117677/

This will be my last order of 6sn7 (now I have around 100 6sn7 tubes).

I expect to get this tube this coming Friday.

I will finish shootout of 6sn7  tubes by this weekend.