[AMRadio] Modulator question

Rob Atkinson ranchorobbo at gmail.com
Sat Jan 30 22:39:21 EST 2016

By "triangular" you mean something like a sawtooth?   Do you hear
distortion or are you only viewing it?  Sometimes the scope pick up is
the problem and the circuit under test will turn out to be okay.
However, that's probably more likely with RF.



On Sat, Jan 30, 2016 at 7:31 PM, Paul Baldock <paul at paulbaldock.com> wrote:
> I'm building a modulator using two EL34s.
> I am testing it in to a matched resistive load. The output between 30% and
> 100% of max (50Watts) gets quite distorted. Driving with a sine wave the
> grids look good, but the output starts to get more triangular the harder you
> push it.  FYI the plate voltage is about 660V and the screen tapped at
> around half of that.
> Any thoughts from you audio buffs?
> - Paul   KW7Y
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