[TLO]

Can someone tell me anything about this tube? A long shot I know there really aren't any numbers other than Motorola made in USA.

It came in with a bunch of tubes I bought, several months back, I'm just getting around to testing it.

This is early 50's RCA 6SN7GT. I have 3 pairs of early 40's and a pair of the popular VT231 (1944). Below is a pair of the early 40's, date code S (1942). You can see that the smoke is almost all the way down to the bottom.

 

[bcowen]

This is early 50's RCA 6SN7GT. I have 3 pairs of early 40's and a pair of the popular VT231 (1944). Below is a pair of the early 40's, date code S (1942). You can see that the smoke is almost all the way down to the bottom.

Any idea what the 180 (or is it 'I' 80?) stands for on the tube to the right? The one on the left is 1944 (H3E), but I can't find any reference to a 1 or I as the first digit on the other one.

 

[JTbbb]

What year are these please?

 

[bcowen]

What year are these please?

1944. Yours were made sometime in Nov - Dec of 1944 and between Jan - Feb, 1944 respectively. Mine was made in May - Jun. Those are actually shipping dates, but it's presumable they were made only shortly before they shipped.

 

[MacMan31]

Any great recommendations for a Lyr 3? Is there 6SN7 socket savers?

 

[DTgill]

Any great recommendations for a Lyr 3? Is there 6SN7 socket savers?

eBay or Amazon, any place that sells tubes, I bought mine from eBay.

 

[David222]

Any great recommendations for a Lyr 3? Is there 6SN7 socket savers?

Would also suggest keeping an eye on HiFi Shark https://www.hifishark.com

It pulls results from ebay, as well as other forums such as US & Canada Audio Marts. By way of example, here is a recent Lyr3 (Canada) that sold within ~48 hours.

* Note --> I may have misinterpreted the question as looking for a Lyr3 vs. tubes for a Lyr3. HiFi Shark can be a good reference / tool either way.

 

[jonathan c]

Any great recommendations for a Lyr 3? Is there 6SN7 socket savers?

 

[LoryWiv]

eBay or Amazon, any place that sells tubes, I bought mine from eBay.

Head-fi member @Deyan can make them. he does terrific work and is a pleasure to deal with.

 

[LoryWiv]

So do these grey/black glass constructions have any effect on the sound or is it (as best as I can gather) just a misguided attempt to shield them from RFI

I read somewhere that they were advantageous in wartime equipment use to shield the tube glow from enemy eyes, Could be mythology but kinda fun to think about.

 

[TLO]

Any idea what the 180 (or is it 'I' 80?) stands for on the tube to the right? The one on the left is 1944 (H3E), but I can't find any reference to a 1 or I as the first digit on the other one.

I am guessing RCA switched to all number code around the late 40's. We can also noticed that they have changed the RCA logo from the famous meatball to the later one. The 1 should be 1951.

 

[TLO]

What year are these please?

These are the RCA codes I found online

Z - 1936
U - 1937
T - 1938
X - 1939
R - 1940
Y - 1941
S - 1942
K - 1943
H - 1944
V - 1945
F - 1946

1 - JAN-FEB
2 - MAR-APR
3 - MAY-JUN
4 - JUL-AUG
5 - SEP-OCT
6 - NOV-DEC

E stands for OEM

 

[ostewart]

Am I right in thinking these Rogers branded tubes (1960's) are very similar/the same as the Sylvania 6SN7GTB?

 

[TLO]

Am I right in thinking these Rogers branded tubes (1960's) are very similar/the same as the Sylvania 6SN7GTB?

I am afraid I cant comment on the sonic similarities or differences between this and SYL 6SN7 GTB, as I have no experience on this tube. Nevertheless, I just wanted to point out that the construction is identical to SYL 6SN7 WGT or early SYL 6SN7 WGTA, and not SYL 6SN7 GTB. Note the 3 holes T-Plate and especially the umbrella spokes. Later SYL 6SN7 GTA and SYL 6SN7 GTB have the same angled T-Plate or Y-Plate.

 

[rawheadjim]

I just got these last week for $72 after someone pointed them out to me on this thread, and I'm really enjoying them so far. They have the best/largest soundstage of anything I've tried yet, good bass and midrange.

6SN7GT RCA radio amplifier JAN CRC audio vacuum tubes 2 valves tested 6SN7GTB