The Reference 6SN7 Thread

Jul 8, 2024 at 9:48 PM Post #10,156 of 10,668
lol I had not read the whole discussion yet but your comments on the great years are correct. I also have some incredible variations from the 50’s of course but 53-the early 60’s are the golden years.
All I learned about the great 1578 years, I learned from you... and maybe @bcowen when I learned too much.
You are most kind in mentioning my collection. I was also involved in what may well have been the largest 6SN7 comparison of all time.🤪
A 6SN7 comparison won by a 1578 as I recall. Probably just a coincidence. :sweat_smile:
 
Jul 8, 2024 at 9:50 PM Post #10,157 of 10,668
All I learned about the great 1578 years, I learned from you... and maybe @bcowen when I learned too much.

A 6SN7 comparison won by a 1578 as I recall. Probably just a coincidence. :sweat_smile:
Well there were over 50 test subjects in a blind study. 🤪 I started stocking up after that, with no idea fewer would be coming in from Russia so the price escalated.
 
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Jul 8, 2024 at 10:18 PM Post #10,158 of 10,668
Try to use a strong light and see if you can make out a circular logo there is a year located there. 1957 is certainly feasible.
Thank you. I had to look close but there was the ghost of an image left and a strong light helped me identify them both as 1980.

Apparently I have poor taste in tubes. It's a good thing I don't listen with headphones as, apparently, they would be shredded by now.

Cheers,
Robert
 
Jul 8, 2024 at 10:29 PM Post #10,159 of 10,668
Thank you. I had to look close but there was the ghost of an image left and a strong light helped me identify them both as 1980.

Apparently I have poor taste in tubes. It's a good thing I don't listen with headphones as, apparently, they would be shredded by now.

Cheers,
Robert
Oh... 1980... that was the outlier throw-back retro year. Playing like it was '58. :joy:
 
Jul 8, 2024 at 10:42 PM Post #10,160 of 10,668
Thoughts on Soviet dual triodes- I’ve been looking at some of these available on the web and would like to hear about others impressions!
1) 6N7S- Available in two builds, Novosibirsk and Foton. Has anyone used either or both? Is one generally better than the other? These are not the older metal base tubes, black plastic base only.
2) 6N8S- I haven’t seen much data on these (at least in English), do these perform?
3) 6N9S- Same as above. Any experiences with these?

Thanks in advance!
I like the 1950's Foton 6N8S's a lot, especially for comparatively inexpensive 6SN7 tubes. Once into the 1960's and later not so much though. They are not to the level of a '50's or early '60's Melz 1578 to my ears, but also not uber expensive like those are these days. I bought a couple spares to be sure I didn't run out. 🤣 🤣

Fotons  2021.jpg
 
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Jul 8, 2024 at 11:44 PM Post #10,161 of 10,668
Thank you. I had to look close but there was the ghost of an image left and a strong light helped me identify them both as 1980.

Apparently I have poor taste in tubes. It's a good thing I don't listen with headphones as, apparently, they would be shredded by now.

Cheers,
Robert
Hi WP,
IMHO, when it comes to tube rolling, YOU have to trust YOUR ears. The same tube can sound very different in different amps. And yes, the same tube in the same system can sound different with headphones compared to speakers.
If you can find a tube that sounds great in your equipment you don't have to apologize to anybody about your taste.
There are people who mainly listen to their equipment, and there are people who enjoy listening to music through their equipment. Or a combination of both.
Either way it doesn't matter - whatever you enjoy is best for you.
 
Jul 8, 2024 at 11:57 PM Post #10,162 of 10,668
I like the 1950's Foton 6N8S's a lot, especially for comparatively inexpensive 6SN7 tubes. Once into the 1960's and later not so much though. They are not to the level of a '50's or early '60's Melz 1578 to my ears, but also not uber expensive like those are these days. I bought a couple spares to be sure I didn't run out. 🤣 🤣

Fotons  2021.jpg
When is your next garage sale?
 
Jul 9, 2024 at 12:28 AM Post #10,163 of 10,668
When is your next garage sale?
Don't know that much about the Russian 6SN7 equivalents. However, based on reading (and experience with the 1950-56 Foton ladder style plate tubes), the best sounding are the MELZ 1578 with the unique round holes in the plate (there may be other good sounding variants of the MELZ tubes) and the Foton 6H8C early ladder plate. Since the Cyrillic alphabet is used, it sometimes translates into 6N8S.
MELZ 1578.jpeg

As for specifics, there are people on this thread who are very knowledgeable about this tube and its variants and the best years (see posts above).
Foton ribbed plate.jpg

This is the Foton tube. The distinguishing feature is the ribbed plate or ladder style plate. Later tubes had smooth plates and don't sound as good.
Here is a picture of the later Foton with smooth plates for comparison:
Foton sm,ooth plate.jpg
 
Jul 9, 2024 at 12:40 AM Post #10,164 of 10,668
There was a link in the envy thread to a post someone made about the different variations of melz construction (with photos), I'll see if I can go find it for you.

Here

1st pair I think are 1957, second pair are 1963 (I own these).
 
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Jul 9, 2024 at 8:24 AM Post #10,165 of 10,668
Hi WP,
IMHO, when it comes to tube rolling, YOU have to trust YOUR ears. The same tube can sound very different in different amps. And yes, the same tube in the same system can sound different with headphones compared to speakers.
If you can find a tube that sounds great in your equipment you don't have to apologize to anybody about your taste.
There are people who mainly listen to their equipment, and there are people who enjoy listening to music through their equipment. Or a combination of both.
Either way it doesn't matter - whatever you enjoy is best for you.
I prefer to say this a different way, some amps allow you to hear differences in tubes better than others. I designed the amps my local group used to compare around 1500 6SN7 tubes and their compatibles. We used music specifically recorded to show off 25 criteria across the sonic spectrum. It was a blind study conducted with a large group. (Accuracy of a large group exceeds that of an individual). There are some differences in the human ear but as humans we tend to hear a specific range of frequencies till age and loud noises take their toll. ( most of our test subjects were college age with a mixture of older listeners.) I set up three smaller experiments prior to the large comparison and Mr. Cowen as well as people at Schiit Audio took part. One can say we hear differently yet in one study with 20 DACs, one received a top score from 90% of those present. In a session with different some different DACs a few years later it finished in second place. This was all from listening to music.🤪 Most all of us have certain capabilities but what a human can hear is not as subjective as you might think.😁

Oh as far as Melz, I own some unusual variants that are great sounding without the perforated plates and the shiny black plates are the best of that lot. I used to find a few every six months or so, but now, no such luck.
 
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Jul 9, 2024 at 9:11 AM Post #10,166 of 10,668
IMG_7959.jpeg
I generally keep a six pack of Melz close by then change those out every month or so for different ones. (Next to the turntable plinth.)
 
Jul 9, 2024 at 9:17 AM Post #10,167 of 10,668
Well there were over 50 test subjects in a blind study. 🤪 I started stocking up after that, with no idea fewer would be coming in from Russia so the price escalated.
The escalation was also due to the effects of @Paladin79 buying for his hoard, oops, I mean collection.
 
Jul 9, 2024 at 9:23 AM Post #10,168 of 10,668
The escalation was also due to the effects of @Paladin79 buying for his hoard, oops, I mean collection.
In our own small way, each of us does what we can. Sam is the owner of one of my amps along with one of the more unusual Melz. @bcowen has the same amp and I gifted him an early 50’s Melz. Both men know tubes.😜
 
Jul 9, 2024 at 7:22 PM Post #10,169 of 10,668
Oh as far as Melz, I own some unusual variants that are great sounding without the perforated plates and the shiny black plates are the best of that lot. I used to find a few every six months or so, but now, no such luck.
Are these the one you are talking about? BTW, these are dated 1956.

20211104_180902.jpg

20211104_180933.jpg
 
Jul 9, 2024 at 7:35 PM Post #10,170 of 10,668
Are these the one you are talking about? BTW, these are dated 1956.


Nope. Consider all the aspects of a standard perforated plate including metal supports at the top, now remove the perforations. That is the only change. Some were grey plates but I like them less.IMG_3335.jpeg

Solid black plate on the left, solid grey plate on the right. Metal supports, stepped bottom mica. Never oval micas or mica supports.
 
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