This is now actually a pretty sweet 4 pill box for an AM operator. Class C here, no SSB operation
Has original ST micro electronics 2d1446s
I have upgraded the power wires with 8 awg high strand copper and an Anderson Connector and tied the output tx voltage supply right to the power input. Moved the ground input connection to the center of the finals. All this makes a huge difference
Little details like ferrite core, inductors to ground/bias the input transformers instead of resistors.
Additional RF filtering on DC supply in amplifier
(2) 3 inch, shrouded cooling fans. Move pleanty of air but are quiet
Bench radio (Single final) Cobra 25Ltd and Original RCI-2950 Bench radio used for testing.
The Cobra keying 1 watt swinging 28 drives this amp now to 450 watts PEP/ 150 Average
The dual final 2950 makes it get up and go. Easily 650 watts PEP and 225+ average power
She will draw every bit of 50 amps if you feed her the onions!
Input tune shows a little less then a quarter watt of reflect with 45 PEP input.
Build guitar amps for a living and have been learning to build RF amps the last 1-2 years by repairing, improving, working on etc any and every linear amp I could get my hands on. It's time to thin the herd.
$400 Shipped, Paypal/goods services
Has original ST micro electronics 2d1446s
I have upgraded the power wires with 8 awg high strand copper and an Anderson Connector and tied the output tx voltage supply right to the power input. Moved the ground input connection to the center of the finals. All this makes a huge difference
Little details like ferrite core, inductors to ground/bias the input transformers instead of resistors.
Additional RF filtering on DC supply in amplifier
(2) 3 inch, shrouded cooling fans. Move pleanty of air but are quiet
Bench radio (Single final) Cobra 25Ltd and Original RCI-2950 Bench radio used for testing.
The Cobra keying 1 watt swinging 28 drives this amp now to 450 watts PEP/ 150 Average
The dual final 2950 makes it get up and go. Easily 650 watts PEP and 225+ average power
She will draw every bit of 50 amps if you feed her the onions!
Input tune shows a little less then a quarter watt of reflect with 45 PEP input.
Build guitar amps for a living and have been learning to build RF amps the last 1-2 years by repairing, improving, working on etc any and every linear amp I could get my hands on. It's time to thin the herd.
$400 Shipped, Paypal/goods services
