![]() ![]() The original 1000pf coupling caps were replaced by 6800pf (yellow ones) for a little better match to the cathode as noted by less reflected power. Installed eleven 6 amp diodes between the center tap of the filament transformer and ground to set the bias at -7.7 volts for a no drive idling plate current of 325 mills. Installed the 3CX3000F7 filament transformer, two 30 amp filament chokes in parallel, the RF drive coupling caps and Grid triode and I removed it when I made my 160 meter modifications). (NOTE: Internet research revealed that no parasitic choke was required with this grounded Full power tests on the 3CX3000F7 were conducted on the popular AM frequencies of: 3885 kHz, 7290 kHz and 14286 kHz with no signs of instability. ![]() I had an Eimac SK-1406 tube chimney for a physically larger 4CX3000 so I made up the space difference by inserting a ring of teflon between the tube and the chimney and "glued" it in with GE Silicon Kitchen and Bath caulk.Īdded a homebrew plate choke, glitch resistor and homebrew parasitic choke (plate circuit schematic at bottom of this webpage with wire size and turns count). Homebrew template and holding the grid ring down with two heavy homebrew aluminum half-circle mounting strips. ![]() Installed the 3CX3000F7 by setting it's grid ring on the top of the The original Gates 4CX3000A socket and wiring was removed and a homebrew heavy aluminum template for the 3CX3000F7 In 2007 I added the 160 meter band, which is described near the end of this webpage. With the major mechanical parts in place, theĨ0, 40 and 20 meter design was easy to build. The cabinet, PI-L tankĪnd right angle drives were leftovers from a partially completed industrial Gates transmitter. The 3CX3000A7 requires a tube socket whereas the F7 is bolted to the chassis. ![]() The 3CX3000F7 (up to 30 mHz) is exactly the same electrically as the 3CX3000A7 (up to 110 The rugged 3CX3000F7 has a grid dissipation of 225 watts vs the popular 8877 which The 3CX3000F7 power grid triode with its 4000 watt plate dissipation loafs alongĪt legal limit Amplitude Modulation, plus It only needs one D.C. Homebrew 3CX3000F7 Amplifier W2DTC's GATES ![]()
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