7 kW output. Assuming 60% efficiency, that would be 7000 divided by .6, then divided by 240, or ~50 amps Hafta run AWG 6 service entrance cable with a 60 amp 240V breaker to the ham shack for that. Add air conditioning too. And get ready for blinking light complaints from any unlucky close neighbors. That's like a charging circuit for a Tesla. 😁
73, Guy K2AV On Mon, Jun 22, 2026 at 2:30 PM Wes <[email protected]> wrote: > Well, that should certainly help you make "Honor" Roll. > > Wes N7WS > > 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. > > > > Contact info. > > email: [email protected] > > Cell: 705 988 0880 > > Address: 2728 Eden Township Road, Sudbury, OM, P3G 1M1 > > > > 73 Roger Parson's, VE3ZI > > _________________ > > Searchable Archives: http://www.contesting.com/_topband - Topband > Reflector > > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband > Reflector > _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
