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Since there are 4 of these in the picture of the amp rated @ 30W/channel; one has to assume it's still a class A/B configuration.
In reading the above reference to Berning's amp this part sounds like the tube was a "white elephant" of sorts:
"Note that the 33JV6 may not be
replaced with a different type. Prior to replacing tubes, be sure
to explicitly follow all of the safety precautions outlined in the
owner’s manual, as high DC (900V) and high AC voltages (1600V)
are present inside the chassis. Since the idle-plate dissipation of
the power tubes is only 7.5W and their heaters are operated below
the rated voltage, their expected lifetime, according to Berning, is
10,000 hours."
Tom (PK)
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