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The Reference 6SN7 Thread

Sep 12, 2019 at 7:34 PM Post #755 of 10,668
Sep 13, 2019 at 9:59 AM Post #757 of 10,668
I need some help with the two tubes in the pictures. I acquired them in my quest for the ultimate 6NS7 tube. I am looking for information and value for them. Or if someone is interested in them I would sell them for a fair price.

Thanks
2019_0908_113242_001.jpg

2019_0908_113548_002.jpg
 

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Sep 13, 2019 at 1:26 PM Post #758 of 10,668
Geezer Rock 001 said:
I need some help with the two tubes in the pictures. I acquired them in my quest for the ultimate 6NS7 tube. I am looking for information and value for them. Or if someone is interested in them I would sell them for a fair price.

Thanks
2019_0908_113242_001.jpg

2019_0908_113548_002.jpg
Click to expand...
The Sylvania looks like a 6SN7GT, early '50s flat plates. The three digit date code should be on the black base: year-week with the year being the first digit. Not my favorite Sylvania 6SN7GT's for my Darkvoice 336SE, as I think the bad boys (early to mid 1952 T-plate three holes), early '50s 6SN7GT chrome domes, and the early '50 2-hole T-plates sound better than them with that amp. Hell, I like Sylvania's early-mid '50s 6SN7GTA's better than the two early '50 6SN7GT flat plates in my possession. Overall, they're pretty good, but there's better from that manufacturer. If used, I would pay $15-20 for one of those flat plates. Typically, I pass them for the others that I mentioned.

As for the CBS 6SN7GTB, I don't know since I don't have any but they seem to be plentiful and cheap.
 
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Sep 13, 2019 at 8:25 PM Post #759 of 10,668
sennfan83261 said:
The Sylvania looks like a 6SN7GT, early '50s flat plates. The three digit date code should be on the black base: year-week with the year being the first digit. Not my favorite Sylvania 6SN7GT's for my Darkvoice 336SE, as I think the bad boys (early to mid 1952 T-plate three holes), early '50s chrome domes, and the early '50 2-hole T-plates sound better than them with that amp. Hell, I like Sylvania's early-mid '50s 6SN7GTA's better than the two early '50 6SN7GT flat plates in my possession. Overall, they're pretty good, but there's better from that manufacturer. If used, I would pay $15 for one of those flat plates at most. Typically, I pass them for the others I mentioned.

As for the CBS 6SN7GTB, I don't know since I don't have any but they seem to be plentiful and cheap.
Click to expand...

The CBS 6SN7GT (not to be confused with the CBS/Hytron 5692) is a decent sounding tube. But just decent -- nothing special. Relatively speaking, it's a $20 tube in NOS condition.
 
Sep 13, 2019 at 9:12 PM Post #760 of 10,668
Would a 6CG7 tube work with an ECC83 to 6SN7 adapter? I got the ECC83 adapter to use with a 12AT7 tube a while back, so wondering if a 9 pin adapter is a 9 pin adapter or just get a 6CG7 to 6SN7 adapterto be safe.
 
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Sep 13, 2019 at 9:18 PM Post #761 of 10,668
JKDJedi said:
Would a 6CG7 tube work with an ECC83 to 6SN7 adapter? I got the ECC83 adapter to use with a 12AU7 tube a while back, so wondering if a 9 pin adapter is a 9 pin adapter or just get a 6CG7 to 6SN7 adapterto be safe.
Click to expand...
No. Wrong pinout . A 6cg7 has the pinout of a 6922. Better to get the right adapter
 
Sep 13, 2019 at 9:19 PM Post #762 of 10,668
Keno18 said:
No. Wrong pinout . A 6cg7 has the pinout of a 6922. Better to get the right adapter
Click to expand...
That explains a lot...thank you. (I meant 12AT7) so have that adapter on order, thanks. :)
 
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Sep 13, 2019 at 9:39 PM Post #763 of 10,668
JKDJedi said:
That explains a lot...thank you. (I meant 12AT7) so have that adapter on order, thanks. :)
Click to expand...

@Keno18 is correct (of course). The 12AU7/12AX7/12AT7 all have the same pinout, just different gain levels. To adapt for a 6SN7 socket, pin 9 is put into play to run those tubes at 6 volts. The 6CG7 has no pin 9 connection.

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Download the TDSL program at the link below. Hasn't been updated in quite some time but is still a very handy program for getting tube info. The data sheet links tab will take you directly to web pages with copies of the original spec sheets. Some of the links go to nonexistent pages now, but most still work.

http://www.duncanamps.com/tdslpe/
 
Sep 17, 2019 at 12:06 AM Post #764 of 10,668
So is it weird I enjoyed (more) the JAN Sylvania 7N7 over the Philco (Franken) 7N7? Maybe I need to let these tubes settle in before judging, the short bottle GE 7N7 has some spark to it, and the Philco 7N7 with the meanest slam, (BAss) , to me the Sylvania combined both evenly. What do I know,
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Sep 17, 2019 at 12:47 AM Post #765 of 10,668
That GE sure looks like a Sylvania. The V-angled plates are VERY similar to Sylvania 6SN7's I've seen.

As for you liking the Sylvie better than Frankie -- there's a lot to be said for Synergy, HP sound profile, and personal preference. Part of the fun is finding the tube that suits what you like and all else be damned!! :wink:

I've found that while I like Frankie, I like the Lansdale Frankies best. I own a Sylvie 7N7 with a middle support rod between the plates (similar to 6SN7W) and it fares as well or maybe better than non-Lansdale Frankies and darn close to the Lansdales. The Lansdales and center support rod Sylvie just have a bit more bottom-end punch, air and top-end extension, IMHO w/ my setup, ears and music preferences.

Don't even get me started on Brimar 6SN7GTs. ;)
 
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