The Reference 6J5 Thread (L63, 6C5, 12J5, 6P5, etc.)
Aug 25, 2021 at 3:43 PM Post #1,622 of 1,699

SHIMACM

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Good company! As somebody who brought attention to the ladder plate Fotons (6H8C) , I was under the impression that they were made between 1952 and 1955. Is the1958 the same construction?

The 1958 Foton does not have ribbed plates. Ribbed plates, if I'm not mistaken, is until the year 1955. However, they also sound pretty good.
 
Aug 25, 2021 at 3:45 PM Post #1,623 of 1,699

SHIMACM

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The 6J5G (ST Coke bottle shape) tubes appeared first in 1936.
The 6J5GT (straight glass) appeared first in 1938.

Interesting. I thought that just because the 6j5gt had a metal base, they could be older. Anyway, thanks for the info.
 
Aug 25, 2021 at 4:12 PM Post #1,624 of 1,699

mordy

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Interesting. I thought that just because the 6j5gt had a metal base, they could be older. Anyway, thanks for the info.
All this information is in the Radiomuseum and it is very easy to access.
Just go to Google, type in Radiomuseum 6J5G and all the information is there.
https://www.radiomuseum.org/tubes/tube_6j5g.html
On the left, a couple of lines down, it says First Source and gives the year the tube was introduced.
 
Aug 25, 2021 at 8:04 PM Post #1,625 of 1,699

bcowen

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Good company! As somebody who brought attention to the ladder plate Fotons (6H8C) , I was under the impression that they were made between 1952 and 1955. Is the1958 the same construction?
I have 1951 - 1956 ladder (ribbed) plates. And I also have some 1956 smooth plates. All my 1957 and later have smooth plates, so it appears that the plate configuration was changed sometime during 1956. 1951 is the earliest year I have (and have seen), but it's possible they were made before then too and I just haven't run across any.
 
Sep 26, 2021 at 7:45 PM Post #1,626 of 1,699

leftside

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Been a little quiet on here lately, so thought I’d post a pic. Not 6J5, but 6N7. I can use in my 6J5 sockets so does this count as a valid post?! :) Both are French Philips, but obviously different boxes.

My new amp from Mishca/1101 Audio will also use these tubes as drivers. Hopefully next month…



DFE48437-2ACF-40DE-A33B-B51132129E99.jpeg
 
Sep 26, 2021 at 9:14 PM Post #1,627 of 1,699

Monsterzero

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Been a little quiet on here lately, so thought I’d post a pic. Not 6J5, but 6N7. I can use in my 6J5 sockets so does this count as a valid post?! :) Both are French Philips, but obviously different boxes.

My new amp from Mishca/1101 Audio will also use these tubes as drivers. Hopefully next month…



DFE48437-2ACF-40DE-A33B-B51132129E99.jpeg
I asked this question in the Glenn thread and never received a response, but what are the sonic differences or economic advantages, if any, between those and a J5?
 
Sep 26, 2021 at 9:45 PM Post #1,628 of 1,699

leftside

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I asked this question in the Glenn thread and never received a response, but what are the sonic differences or economic advantages, if any, between those and a J5?
More power with 6N7. The Fivre 6N7G see a lot of time in my amp. Combined with TungSol 5998 and things are rocking. In general I’d say 6J5 are cheaper, but it all depends on brand.
 
Sep 26, 2021 at 10:38 PM Post #1,629 of 1,699

mordy

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More power with 6N7. The Fivre 6N7G see a lot of time in my amp. Combined with TungSol 5998 and things are rocking. In general I’d say 6J5 are cheaper, but it all depends on brand.
The 6N7 is a 0.8A dual triode - one tube is enough with an adapter for a 6SN7 socket.
The 6J5 is a 0.3A triode and you will need two of them so 0.6A vs 0.8A.
The metal versions of these tube are still very inexpensive; glass GT straight glass versions can also be found at reasonable prices . The Shoulder type G versions cost more and especially the European made G/GT ones can be pricey.

In my personal experience I get better results with two triodes than one dual triode. I don't know why it is so; perhaps it is amplifier dependent (or maybe not).
 
Sep 26, 2021 at 11:48 PM Post #1,630 of 1,699

leftside

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The 6N7 is a 0.8A dual triode - one tube is enough with an adapter for a 6SN7 socket.
The 6J5 is a 0.3A triode and you will need two of them so 0.6A vs 0.8A.
The metal versions of these tube are still very inexpensive; glass GT straight glass versions can also be found at reasonable prices . The Shoulder type G versions cost more and especially the European made G/GT ones can be pricey.

In my personal experience I get better results with two triodes than one dual triode. I don't know why it is so; perhaps it is amplifier dependent (or maybe not).
I use 2 6N7.

7A00C675-89A3-4B4F-9B75-0B719ADC3F54.jpeg


Yes agreed. All amp dependent and what tubes the amp was designed for.
 
Sep 29, 2021 at 6:40 AM Post #1,632 of 1,699

maxpudding

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Anyone know of a place to get 90 degree octal socket savers/adapters? Have a friend wanting to use 6J5s in place of 6SN7 but their amp doesn't fit the adapter in the current configuration!
Maybe you could send a PM to @Deyan?
 
Oct 2, 2021 at 10:22 AM Post #1,634 of 1,699

triod750

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One thing to remember regarding 6N7 is that it has a common cathode in spite of being a dual triode. I was going to try them as output tubes, substituting 6SN7 used as stacked triodes and ordered adapters for them. Then I read a reply from Glenn to someone else that this wasn't going to work, or so I interpreted what he wrote. I had to change my plan accordingly and used my 6N7 as input instead.
 
Oct 2, 2021 at 5:07 PM Post #1,635 of 1,699

leftside

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One thing to remember regarding 6N7 is that it has a common cathode in spite of being a dual triode. I was going to try them as output tubes, substituting 6SN7 used as stacked triodes and ordered adapters for them. Then I read a reply from Glenn to someone else that this wasn't going to work, or so I interpreted what he wrote. I had to change my plan accordingly and used my 6N7 as input instead.
The custom amp builders can make you an amp where you can use 6J5 or 6N7 in the same socket. This is what Mischa/1101 Audio did for me. He's also doing the same for me in my second amp from him. Coming soon.... (but with KT66/EL34/4654/etc instead of 5998/6080).
 

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