My Tube Collection, Welcome to share yours

[oldvinyl]

 

[oldvinyl]

 

[adrian cheng]

Beauties

 

[oldvinyl]

Beauties View attachment 160216

What year are these Tungsrams?
I am guessing they are nickel plates.

 

[oldvinyl]

I got an email notification from subscribing to this thread asking about the Australian VT-231 6SN7GT that I posted photos of. The odd thing is that the post was not actually added to this thread. So, I will add the info here.

From the AWV website: AWV website

"AWA Radiola RadioAWA established a joint venture (Amalgamated Wireless Valve Co. Pty Ltd) with Radio Corporation of America (RCA), to manufacture radio valves (vacuum tubes) at the Ashfield works under the AWV, RCA and Radiola brands. During World War II AWV produced a range of defence electronics materiel, including klystrons and magnetrons for radar equipment."


This shows the AWA marking:

This shows the Radiotron marking:

The V11 likely follows RCA date codes and would be November 1945.

This shows the AWV and Radiotron marking on boxes for 5U4G.

So it seems that there was a vacuum tube plant in Australia and their designs were based on RCA.

This link also confirms the RCA connection: Radio Museum

 

[CDawg]

I got an email notification from subscribing to this thread asking about the Australian VT-231 6SN7GT that I posted photos of. The odd thing is that the post was not actually added to this thread. So, I will add the info here.

From the AWV website: AWV website

"AWA Radiola RadioAWA established a joint venture (Amalgamated Wireless Valve Co. Pty Ltd) with Radio Corporation of America (RCA), to manufacture radio valves (vacuum tubes) at the Ashfield works under the AWV, RCA and Radiola brands. During World War II AWV produced a range of defence electronics materiel, including klystrons and magnetrons for radar equipment."


This shows the AWA marking:

This shows the Radiotron marking:

The V11 likely follows RCA date codes and would be November 1945.

This shows the AWV and Radiotron marking on boxes for 5U4G.

So it seems that there was a vacuum tube plant in Australia and their designs were based on RCA.

This link also confirms the RCA connection: Radio Museum

I'll see what details I can dig up but I think there were multiple audio tube plants in Australia. AWV of Sydney. Two AWV tube plants in Ashfield and one moved to Rydlemere. Alexandria. Hendon Works. Westrex in Melbourne.

I think AWV is more RCA license and Alexandria and Hendon Works Philips license.

 

[Mr.Miniwatt]

Some british more unknown stuff: N78 and CV2179. D-getters, tubes look close internally but are totally different electrically. I plan to try these on my amp and since I have several, I do hope I'll like them. These are the pairs I matched to use soon.





I have no clue why the 7-pin tubes are not used more often. They are usually older and better than many others. 6J6, E90CC, E92CC, these...

 

[adrian cheng]

What year are these Tungsrams?
I am guessing they are nickel plates.

Yes nickel plate made in 1960

 

[oldvinyl]

I'll see what details I can dig up but I think there were multiple audio tube plants in Australia. AWV of Sydney. Two AWV tube plants in Ashfield and one moved to Rydlemere. Alexandria. Hendon Works. Westrex in Melbourne.

I think AWV is more RCA license and Alexandria and Hendon Works Philips license.

From what I was reading, the Australians had arrangements with RCA for their radar and larger tubes, with Philips and Telefunken for other tubes. A best of all possible options arrangement. I found mention of three manufacturing facilities.

 

[CDawg]

From what I was reading, the Australians had arrangements with RCA for their radar and larger tubes, with Philips and Telefunken for other tubes. A best of all possible options arrangement. I found mention of three manufacturing facilities.

I believe that AWV of Sydney got its machinery to make tubes from Telefunken.

Westrex got some kind of support from Western Electric. I'm just not sure of the details but I know there's a connection.

 

[oldvinyl]

12AX7/ECC83 with ProComm label. I had them screened and graded for noise/microphonics.

 

[oldvinyl]

Turns out the Pro/Comm 12AX7 were Tungsram production.





Might not be the best sounding tube for signal path (a little too husky for my taste), but my phono stage uses 12 of them in the dual power supplies.

 

[CDawg]

Turns out the Pro/Comm 12AX7 were Tungsram production.

View attachment 160472

View attachment 160473

Might not be the best sounding tube for signal path (a little too husky for my taste), but my phono stage uses 12 of them in the dual power supplies.

I recently started listening and looking at my Tungsram ECC83 tubes in depth and noticed some differences in the glass and wiring.

One Tungsram has four seams at the top. The other does not. The wiring on the bottom of the tubes is also different. One has that metal T bar and the other does not. I can't find it this second but I also have another stapled ECC83 that has no seams and no T bar IIRC. If you look at the welded plate Tungsram there's a similar pattern too. Same with other Tungsram tubes like ECC81 or ECC82.

I think there's four places that made Tungsram ECC83. Tungsram Tillburg, Two Tungsram in Hungary and one in Austria.

The one with the T bar is the normal Tungsram made in Hungary. The one with the four glass seams on top is from Austria. The other Tungsram Hungarian factory has smoother plates with the ribs sticking out less. Then there's Tillburg.

I'm not 100% sure but that's what I'm thinking now.

 

[oldvinyl]

I have quite a few Tungsram ECC83. Some with Westinghouse, ProComm and maybe even Tungsram labels.
Here is one shot of a set, will try to get some more photos.

 

[CDawg]

I have quite a few Tungsram ECC83. Some with Westinghouse, ProComm and maybe even Tungsram labels.
Here is one shot of a set, will try to get some more photos.
View attachment 160512


View attachment 160513

That's exactly what I'm talking about!

The one on the left with the red tip in the first pic has wiring on the bottom and the one on the right side with the blue tip has wiring on the bottom with that T bar connecting things. Not sure what the name of that bar is. It took me years to realize their was a difference between the stamped plate Tungsram. I think there's at least two or three versions of them.

 

[oldvinyl]

That's exactly what I'm talking about!

The one on the left with the red tip in the first pic has wiring on the bottom and the one on the right side with the blue tip has wiring on the bottom with that T bar connecting things. Not sure what the name of that bar is. It took me years to realize their was a difference between the stamped plate Tungsram. I think there's at least two or three versions of them.

Following will be photos of various ECC83 12AX7 from Tungsram.
From what I can tell, only one set is labeled for date. On those, the FC code on the tube matches the box (1978).
Some of these are 12AX7, others are ECC83, others are 7025. The 7025 is a 12AX7 with improved noise and hum. The 12AX7A is low hum and low microphony.
None of these have the ribbed tops

 

[oldvinyl]

These are 12AX7A/7025 Westinghouse boxes from Canada. The box tops show made in England. Note that the tube is labeled 12AX7A/ECC83.

These have the bar across the bottom that you mentioned. My guess :: the bar helps reduce vibration.

 

[oldvinyl]

These are also Westinghouse boxes, but labeled 12AX7. Note that these tubes are ECC83 and state made in Hungary.
These also have the bars at the bottom.

 

[oldvinyl]

These are the Pro/Comm I posted earlier. They are labeled 12AX7A / ECC83.

 

[oldvinyl]

These are ECC83 in Tungsram boxes with date codes on box matching the codes on the tube. No extra bar at the bottom.

So far it seems that regular ECC83 is without the bar, the low noise/hum/microphony 12AX7A or 7025 types have it. That's my theory.