Re: FW: LF: FETs getting sick - why not use tubes?

[M0FMT <m0fmt@yahoo.co.uk>]

No





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On Wed, 5/4/17, Chris Wilson <dead.fets@gmail.com> wrote:

 Subject: Re: FW: LF: FETs getting sick - why not use tubes?
 To: "M0FMT" <rsgb_lf_group@blacksheep.org>
 Date: Wednesday, 5 April, 2017, 13:28
 
 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 FET 
 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