Oddball telefunken id help

[dmag]

I dont know where i got this. Or when. It may have come in a tube caddy I bought long ago. Any help with ID would be appreciated.
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[EL504]

I think it probably is an EF89 (or an UF89, which has the same characteristics except for heater voltage/current).

Ment for RF/IF stages in radios. Not really suitable for audio because it has variable mutual conductance (which will cause extra distortion when used as an audio tube).

 

[dmag]

Thanks for that. I looked on that auction site. Looks just like in.
sf