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6l6metal jacket rca" tubes


 
6/4/1999 9:02 AM
Nik
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6l6metal jacket rca" tubes
Hello!!i am new to this forum,so bare with me.  
i got some nos military 6l6(rca).  
are they any good i got them realy cheep.
 
6/4/1999 10:12 AM
MKB
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Two things come to mind; first, Aspen Pittman in the groove tubes book says that the metal 6L6's can be microphonic. Also, early 6L6's may not handle the plate dissipation or voltage that the 6L6GC's or 5881's can. But, I have no first hand experience with them. I'm sure some of the other guys here can elaborate.
 
 
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6/4/1999 10:51 AM
Graywater
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Nik,  
 
To elaborate on MKB's post, the 6L6s (the "G"" is for "glass") you have WILL NOT dissipate the same amount of heat as the upgraded A,B, or C glass versions - the plate dissipation is only 19w. Still, for a 20-30w amp these make OK tubes and I've not had as much microphonic troubles out of the few I mess with as I've had with various 12AX7s/6EU7s. Good for you own designs. And, if you are a bit crazy, you can up the dissipation by running them in an oil bath - ham operators used this trick and the 6L6 as a final when thousands of war surplus 6L6s appeared after WWII.  
 
GW
 
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