开云体育

This is a big ongoing project thst is half complete. It involves the following:
1. The top tank tuning capacitor is converted to split stator by using threaded nylon rod to hold the vanes and putting an insulating spacer between the two halves. This allows me to run the two PT15s in push-pull.
2. All tank coils are replaced with new ones for the desired bands 160.80 and 40 and are split in the center and routed through the tank bandswitch to the primary of a big toroid to which the 1250v HT is applied on a center tap. The secondary of the toroid has the lower of the tank tuning capacitors across it and its many taps go to one of the antenna? tap switches. This effectively makes a balanced Pi circuit.
3. A big toroid is used to drive both PT15s in push pull? between gris and filament, but neither is ground. Instead a tap somewhete grid and filament ends is grounded so operatin is half way between ground grid and grounded cathode. This is multifilar winding to pass heater citrent to both filaments and insert grid bias. The primary of the transformer is a center tapped 2 +2 turns to accept the output of the balanced Pi citcuit of the driver, which is two B5? base 807 copy attempts and replace the VT105? triodes.?
4. The modulstor is an I and a Q beam deflection tube, the sum of whose outputs drives the driver grids. The deflection plates take I and Q modulsting signals, which SSB? come from a ployphase RC quafrature network.? The hrids of the beam deflection tubes are driven by quafrature RF using a wideband LC quadrature network covering 1.75 to 10MHz.
5. Power supply is a 12v transistor Hbridge rnning at 209KHz drivibg a toroid to provide 259v. Venter tap of the primary gives a vobstantv6v for filsments. The 259v secondary dtives a push-pull Cockroft Walton 5 stage rectifier giving 259, 500 and 1250v. Psu is pretty small and fits in a screened box in the back whete the big green resistors were.
I will post pictures when complete.