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1st June 2006, 07:09 PM
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#1 |
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diyAudio Member
Join Date: Aug 2004
Location: Buenos Aires
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new on tubes
Hello, I've just started with valves, all my knowledge is about transistors.
I have bought an amplifier single ended with EL84 and Don't know which valve is the driver so I posted a picture here asking if someone that really knows about this devices can recognize it. It is a 12ax7 or 12au7 or the like? The label was deleted. Thanks in advance for your help. 
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Jorge |
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1st June 2006, 07:11 PM
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#2 |
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diyAudio Member
Join Date: Aug 2004
Location: Buenos Aires
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another picture
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Jorge |
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1st June 2006, 07:23 PM
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#3 |
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diyAudio Moderator
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It's definitely in that series, and definitely NOT a 12AT7. If you can trace out the values of the plate and cathode resistors, it would be easier to pin it down exactly.
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“Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache |
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1st June 2006, 07:28 PM
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#4 |
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diyAudio Member
Join Date: Aug 2004
Location: Buenos Aires
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HI SY, thanks for your prompt response
what values it is needed, voltages?, resistors?, what I need to trace exactly, I am @ work now, but I can trace tonight and inform late today or tomorrow. Thanks again!!!!
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Jorge |
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1st June 2006, 07:48 PM
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#5 |
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diyAudio Member
Join Date: Mar 2006
Location: Michigan
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Some times I know if you breath on the tube, getting condensation on it will make the numbers re-appear, kindof like writing a
 face on the window then breathing on it.Welcome to the world of tubes, its like the Hotel freaking California. you can check-out anytime you like, but you can never leave! you're going to be addicted to tubes for life! |
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1st June 2006, 07:57 PM
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#6 |
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diyAudio Moderator
Join Date: Jun 2004
Location: Georgetown, On
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Hi JORGETronic,
The plates appear to make that a 12AU7, longer than a standard 12AX7 for sure. I haven't seen a so called "long plate" 12AX7 in the flesh, so I can't say for sure. Fogging the glass is a last resort for me beyond sticking it in a circuit or tube tester. -Chris |
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1st June 2006, 08:07 PM
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#10 |
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diyAudio Moderator
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Resistor values would do, voltage values would be a great confirmation.
Chris, I've got piles of old 12AX7s that look just like that. Wouldn't it be a kick if it turned out to be a 7247!
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“Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache |
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