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Old 26th August 2011, 10:29 AM   #1
Skorpio is offline Skorpio  Denmark
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Default Identifying EL34 tube?

I have two old/used EL34 in my SimpleSE amplifier. They are in full working condition and I would like to buy a new set of the same...

The problem is that I can't identify them as most of the printing is gone. I can't attach a photo at the moment, but I can give some clues:

1. The base is medium brown
2. The printing is white
3. Central on the tube the line "EL34/6CA7" is printed
4. Above the type printing something has been printed, perhaps a logo or something. Perhaps a print with more than 1cm diameter..?
5. On the base a small label has been places, it is brown with two white windows: "Grade:" and "Measured by:"


Anybody with a clue?
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Old 26th August 2011, 11:24 AM   #2
srh is offline srh  New Zealand
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Hi, possibly Dutch Philips Miniwatt. If they are there should be etched in the glass bulb just above the base a batch# and factory id.
e.g. X14
L1G
A Google search for EL34 will bring up sites with photos of various manufacturers products.
Cheers,
Steve.
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Old 26th August 2011, 11:49 AM   #3
Skorpio is offline Skorpio  Denmark
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Quote:
Originally Posted by srh View Post
Hi, possibly Dutch Philips Miniwatt. If they are there should be etched in the glass bulb just above the base a batch# and factory id.
e.g. X14
L1G
A Google search for EL34 will bring up sites with photos of various manufacturers products.
Cheers,
Steve.
Ok, thank you...I will check that later today!

Regarding Google search...I have spend some hours searching....and found nothing looking like mine!
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Old 26th August 2011, 11:54 AM   #4
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Refer to this website for manufacturer and date codes: Mullard, Philips, and Valvo Tube Codes
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Old 26th August 2011, 11:57 AM   #5
Skorpio is offline Skorpio  Denmark
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These are looking very close:

Click the image to open in full size.


But I don't think there is that narrowing of the glass tube just at the base?
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Old 26th August 2011, 12:07 PM   #6
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Another thing that might help identify them, is the fact if they have got a hole in the pin's guide or not.
But as mentioned before, better look for etch codes first.
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Old 26th August 2011, 12:15 PM   #7
Doz is offline Doz  United Kingdom
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What does the top of the bottle look like? Does it have a cross shape in the glass?
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Old 26th August 2011, 02:09 PM   #8
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Double getters as above? Shape of getters as above?
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Old 26th August 2011, 05:27 PM   #9
Skorpio is offline Skorpio  Denmark
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The top of the tubes are Flat/round without any other things. And yes double getters...
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Old 26th August 2011, 05:51 PM   #10
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Finding a code etched into the glass ( around the base perhaps? ) can be tricky sometimes, rotating the valve in different lighting conditions sometimes reveals it. XF2 perhaps?
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