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-   -   help identifying telefunken tubes (http://www.diyaudio.com/forums/tubes-valves/206579-help-identifying-telefunken-tubes.html)

mojoworker 12th February 2012 06:19 PM

help identifying telefunken tubes
 
hi -

i have 2 telefunken tubes where the writing is all but gone. one was in a box hand labeled ecc85, but many tubes from this batch were in improperly labeled boxes, so i don't feel comfortable relying on that. pins 4+5 and 4+9 have continuity. the plates are smooth and have the same length, but appear slightly different as far as the side holes are concerned. (see details on image links below)

i have uploaded a set of pictures of each to photobucket here:

telefunken nr 1 pictures by langlieger - Photobucket

and here:

telefunken nr 2 pictures by langlieger - Photobucket

if i can be sure they are safe to try as an ecc83/12ax7 type that would help. i just feel to unsafe to stick them in an amp and try, since i don't know the expected heater voltages.

any tips would be greatly appreciated -

chris

the_manta 12th February 2012 06:39 PM

Definately not an ECC85
can be ECC82 or 83. ECC81 look different.
Just plug it in. You can't really damage anything when you put a 82 in where a 83 should be. It just distorts and gain is much lower.


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