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What number is this rectifier tube? There are no markings on it. I think it is a rectifier tube because the pins match a 5U4 and it has two separate elements? Thanks!
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Need to see a side view to be sure, but it looks like a 5R4WGA. -
Or 5R4WGB.
Turn it up so that everything is louder than everything else.Comment
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You might try using a flashlight. I find that some tubes have writing on the glass that is almost completely invisible unless you have a light shine on it at the right angle. I use a little flashlight and move it around as I spin the tube in my fingers.
You're probably right, but you never know...Comment
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Another trick is to fog up the glass by breathing on it. This sometimes reveals very faint markings.Turn it up so that everything is louder than everything else.Comment
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On rare occasions turning off the lights and using a UV lamp can reveal lettering.Comment
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Definitely a 5R4, could be any suffix though, Chatham comes to mind, fairly common.Comment
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Thanks guys! I could not find any other markings on the tube with flashlight or fog breath.
Here is another view of the tube. The liquid in the cup is "amplifier repair fluid". I find it helps tremendously and no workbench should be without it!
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I see 'CH' by your thumb - is there any other lettering?Comment
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