[AMRadio] Subj change - HB designs

Geoff/W5OMR ars.w5omr at gmail.com
Mon Jul 30 10:37:09 EDT 2007

Brett gazdzinski wrote:
> But is there any advantage over the 8 ohm to grid
> setup?
> The disadvantage is a lot of complexity, additional power
> supplies, transistors that can fail, heat sinks, etc....
> A lump of iron is a lot simpler...

If you don't mind the hysteresis loss and subsequent cross-over 
distortion addition through the iron.

>> Transformerless audio-driving a Class B modulator.  This way, you can 
>> impose whatever audio you can get from your speech-amp 
>> (source) onto the 
>> grids of the modulator... and, with ~600v peak-to-peak, you 
>> could drive 
>> even a pair of 450TL's with this setup.  It's certainly over-kill for 
>> pentodes, tetrodes, or smaller triodes like 811's, or 812's.


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