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Author Topic: Tube Picture Guide  (Read 15772 times)

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Offline Nick Culbreth

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Tube Picture Guide
« on: March 03, 2005, 08:27:49 PM »
I've been sick this afternoon so I decided today would be the perfect time to put together a tube picture guide that some of us discussed in another thread.  Here are the pictures I've got so far, I think I have a couple more but this is pretty much all I've got.  For the sake of organization I'd really like it if we could keep this free of any banter and just have pictures.  If anyone else has anything to add, feel free to do so.  :)

Edit:  I came across a tube factory code list, it's pretty useful to help find out where the tube was made.  The two bottom pictures are examples of the factory code, note the delta on each tube indicating they were made at the Heerlen Holland plant.  Not sure if anyone was interested but I thought I'd pass it along just incase.
« Last Edit: March 03, 2005, 11:30:12 PM by nmculbreth »
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Offline Nick Culbreth

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Amperex Bugleboy 6DJ8
« Reply #1 on: March 03, 2005, 08:29:16 PM »
Amperex Bugleboy 6DJ8
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Offline Nick Culbreth

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Amperex Orange Globe 12AU7A
« Reply #2 on: March 03, 2005, 08:31:02 PM »
These are pictures for the Amperex Orange Globe 12AU7A tubes with the halo getters.
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Offline Nick Culbreth

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Cifte 12AU7WA
« Reply #3 on: March 03, 2005, 08:32:30 PM »
This tube was made in the late 1950's by Mazda in France and branded Cifte.
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Offline Nick Culbreth

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RCA Cleartop 12AU7
« Reply #4 on: March 03, 2005, 08:34:58 PM »
These are pictures of the RCA cleartop 12AU7 with the side getter.  These were rebranded for Conn organs.
« Last Edit: March 03, 2005, 09:30:45 PM by nmculbreth »
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Offline Nick Culbreth

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RFT 12AU7
« Reply #5 on: March 03, 2005, 08:37:45 PM »
These were made in the 1980's in East Germany.
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Offline Nick Culbreth

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Sylvania 12AU7A
« Reply #6 on: March 03, 2005, 08:40:44 PM »
These were made in the USA, I'm not sure about the era.
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Offline Nick Culbreth

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Amperex Orange Globe 12AX7
« Reply #7 on: March 03, 2005, 08:43:22 PM »
These were made in Holland in the 1960's.  This tube has a dimpled getter dish, which can be seen in the third picture.
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Offline Nick Culbreth

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Electro Harmonix 12AX7EH
« Reply #8 on: March 03, 2005, 08:45:19 PM »
This is a current production tube made in Russia.
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Offline Nick Culbreth

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Telefunken Ribbed Plate 12AX7
« Reply #9 on: March 03, 2005, 08:50:30 PM »
This tube was made in West Germany, I believe these predate the smooth plates.
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Offline Nick Culbreth

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Telefunken Smooth Plate 12AX7
« Reply #10 on: March 03, 2005, 08:52:00 PM »
This tube was made in West Germany, these came after the ribbed plates.
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Offline Nick Culbreth

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Telefunken Diamond Bottom Mark
« Reply #11 on: March 03, 2005, 08:53:41 PM »
This is a picture of the diamond mark on the bottom of Telefunken tubes, it's kind of hard to see but it's there.
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Offline Nick Culbreth

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Sylvania Gold Brand 5751 (Grey Plate)
« Reply #12 on: March 03, 2005, 08:58:02 PM »
This is the Sylvania Gold Brand 5751 with three mica spacers and grey plates.  In most cases this can be substituted for a 12AX7, it doesn't have as much gain as the 12AX7 but I've never had a problem using them.
« Last Edit: March 03, 2005, 08:59:48 PM by nmculbreth »
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Offline Nick Culbreth

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Electro Harmonix 6922
« Reply #13 on: March 03, 2005, 09:01:09 PM »
This is a current production tube made in Russia.
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Offline Nick Culbreth

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Re: Tube Picture Guide
« Reply #14 on: March 03, 2005, 09:03:38 PM »
This is a current production tube made in Slovakia.
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