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 Post subject: OSRAM HL2/K Triode WD11 Substitute???
PostPosted: Jan Sun 23, 2011 9:54 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 902
Location: Parma,Ohio,USA
I bought these two NOS OSRAM triodes from a guy in Australia in 2000.They are the same diameter as a UX-199,and perhaps alittle shorter. What is unique about them is that they have the same pin configuration,and spacing as the now scarce WD11.-So it really is a WD11 substitute tube,the only difference(besides gain) is the filament voltage is 2 volt.

The pin types are the "banana plug" type,which are split pins,so the corresponding Anode pin can be made larger to fit the WD11 socket snugly. The seller stated that the other HL2/K tubes he had worked very well in a Radiola III,with a gain of 27 and a Gm of 1500 uA/V,whereas a WD11 has a gain of 6.6,and a Gm of 440uA/V.

On the tube boxes(in nos cond.) it says,"Made in England for the General Electric Co. LTD. Of England."-Also OSRAM and HL2/K ,4 pin" on the top of the plain brown boxes.
I did alot of research at the time and could find NOTHING on or about this tube,(which is very strange)
Anyone know or hear of this tube? Alan,where are you??-If anyone knows it would be you.
thanks in advance,
Don


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 Post subject:
PostPosted: Jan Mon 24, 2011 2:30 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 30698
Location: Pocasset, Cape Cod, MA
RadioMuseum.org has a page on it:

http://www.radiomuseum.org/tubes/tube_hl2k.html

According to Keith Thrower's book it was a 1934 design, a glass version of a Catkin. It's the standard European basing (started with the French TM tubes in WW1).

Strange-looking but I guess it will work, and not look too out-of-place.


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 Post subject:
PostPosted: Jan Mon 24, 2011 4:26 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 902
Location: Parma,Ohio,USA
Thanks very much for the information on this tube Alan.

Don


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