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From: Chris Wilson <dead.fets@gmail.com>
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To: M0FMT <rsgb_lf_group@blacksheep.org>
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Subject: Re: FW: LF: FETs getting sick - why not use tubes?
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Hello M0FMT,
Wednesday, April 5, 2017
Did you not find the Transorbs added capacitance upset things? I found
the drain waveform was considerably deteriorated when I experimented
with Transorbs to limit spikes.
> Hi all
> The Decca PA seems to be scattered with spike limiting diode from
> memory Transils / Transorb TVS diodes. (don't know the values) I
> usually put one in the drain set above the peak drain wave voltage
> seen on the scope and below the peak operating value of the FETÂ So far so good in single ended amps.
> Jim M0MBU did a short treatise see
> http://www.wireless.org.uk/guard.htm.
> The Decca TX "guard circuit" by Jim Moritz, M0BMU.
> 73 petefmt
mailto:dead_fets@gmail.com