Mystery Tubes!

thefragger

thefragger

Certified Crazy.
Hey Guys,

I've bought a bunch of tubes. I knew that I needed them because of their model numbers, that's why there's many of 'em. They were dirty and I cleaned them.




... but I ended up cleaning a majority of the markings off... and I can't remember what they were for. Whoops. Can anyone help me identify these tubes?


Thanks a million!
 

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thefragger said:
They do look a lot alike, eh... but the third tube has 'BE-something-something' on it... The third character could be a '7' it looks like (BE7-something).

Am I making things up?
Click to expand...

If the tubes are xBE7 (6BE7) then you may be dealing with a heptigrid tube made by Philips, but the only data sheet I show on it is http://www.mif.pg.gda.pl/homepages/frank/sheets/030/e/EQ80.pdf.

You might try a magifying glass and have a squint at one of them to see where the pin leads are going and how many grids there are.... :scratch2:
 
They look like either Amperex 6EJ7 or 6EH7 tubes. The one with the black "swiss cheese plate" appears to be a japanese tube.

If you want to read the faded printing, put the tubes in the freezer, or outside, depending on where you live. Let them get nice and cold. Then, take them out and breathe on them. The condensation will usually hi-light the ghost of the silkscreening.
 
6EJ7 / 6EH7 are the commonest tall tubes with the mesh shield, but there are others. The short one MIGHT be a 6267. Look for etched codes near the bottom - all Philips divisions used them. First two letters of top line is tube type ID - Google "Philips codes".

An emission tube tester could help - most of these have multiple internal connections that show up as "shorts" - check against the usual suspects.
 
fsjonsey said:
They look like either Amperex 6EJ7 or 6EH7 tubes. The one with the black "swiss cheese plate" appears to be a japanese tube.

If you want to read the faded printing, put the tubes in the freezer, or outside, depending on where you live. Let them get nice and cold. Then, take them out and breathe on them. The condensation will usually hi-light the ghost of the silkscreening.
Click to expand...

That sounds like a neat trick... I'll stick 'em outside for a bit and see what I can read. I tried reading what I could by reflecting light off the glass at a narror angle-- it usually works, except on all these guys-- and it shows up as a ghost image of what used to be there.


Awesome signature, btw.
 
andy said:
Most European tubes have a cryptic code etched on them that you can use to ID them. The etching is permanent and tells you the type, where they were made, and when they were made.

http://www.audiotubes.com/PhilipsCodeList.pdf
Click to expand...

I can read Ancient Greek but I can't decrypt these codes. I'm reading "JB3 B9D1" on one tube, "B9C3" on another, "Y413," "28612201," "JB3 something". The B's have a defined straight edge and I doubt they're 8's

The prefix "JB" means that those are EF184/6EJ6 tubes?


Can anyone explain to me how the codes are compiled?

I'm going to try and put a few outside and see what I can get.
 
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