Move it to 13.56 Mhz and build your own MRI machine..................
Lee KX4TT
On Monday, June 22, 2026 at 03:39:08 PM EDT, Guy Olinger via Topband
<[email protected]> wrote:
7 kW output.
73, Guy K2AV
> On 6/22/2026 5:15 AM, jim.thom jim.thom--- via Topband wrote:
> > Buddy back east, asked me to post this for him. If interested, contact
> > Roger, VE3ZI. He is moving back to the UK, and does not want to ship
> it
> > to the UK.
> >
> > "The amp uses a 4CX5000A which was new old stock and has very few hours
> on
> > it. It is driven in passive grid and has a GM3SEK tetrode board
> > considerably modified for the high screen voltage. The plate tuning
> > capacitor is a 15kV 60A type and the output capacitor is air spaced.
> There
> > are vacuum relays on both input and output. There is a Heyboer CCS 4500V
> 2A
> > transformer. This provides something over 5kV on load - would be a bit
> more
> > but my mains supply sags. There are separate meters for grid current,
> > screen current, filament voltage, plate voltage, plate current and
> relative
> > power output. According to my LP100 power meter it will provide 5kW
> > continuously and 7kW if pushed. It is cooled by a 8" blade diameter fan
> and
> > stays nice and cool. There are separate controls for bias and filament
> > voltage adjustment, and filament, screen and plate voltages are step
> > started. It is normally run in Class AB1, but bias can be adjusted for
> > Class C if preferred."
> >
> > It can also be easily modified to add 80 and 40m if you wanted to.
> > Roger can provide pix, schematics, etc.
> >
>
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