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RE: JJ EL509S

McIntosh is using 8xEL509S in the recently announced MC3500MKII. The MKI version used 6LQ6s as finals, a genuine old time TV horizontal sweep tube. I question the wisdom of designing and marketing an amp using expendable components available from one source...but what do I know.

Edit: A pentode/beam tetrode driven at g2 is not a triode. Looking at the curves of a typical pentode where g1 is held constant (usually 0V or cathode potential) and g2 is varied, you clearly see a pentode characteristic: steep rise at lower anode voltages and then a relative leveling off.


Edits: 11/10/21
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