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In Reply to: RE: Notice that both g1 AND g2 of the modulator are driven... posted by Steve O on April 20, 2017 at 22:23:13
I did notice that as that's the way I did my stand alone 813 modulator.
Look at the Altec 260A amp. Notice the grid chokes in parallel with the 180k resistors.Notice the GNFB that feeds each tube of the same channel.I'm curios as to what the bandwidth is of what is probably an interstage trafo that is probably acting as a gain stage? I almost bought a pair of these but they were too heavy to move.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Follow Ups:
I'd have more concern about the response of a 16Kohm OPT with insulation good for 1.8KV+. Wasn't the 260 pretty much a PA booster amp?
That schematic is missing a ground point between the two 10k pots at the final's grid choke.
The input trans is a K-241-D, and yes there is significant step-up in voltage.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
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