Fig 1 Experimental phase

This 10 - 80 m amplifier is using two VHF bilolar power transistors PHILIPS BLW60. The gain of a VHF bipolar transistor can be very high but the amplifier (Fig 1) was perfectly stable in the experimental phase. I expect the BLW transistors could be replaced by similar VHF-types due to the heavely collector to base feedback.

It is possible to build this KISS amplifier (Fg 2) succesfully with the brief information shown on the schematics and diagrams.

The amplifier (Fig 2) performs well with a two-tone test and on-air reports are excellent when using an Yaesu FT-7 as the (10 W) driver.

No PCB need be made. Copper clad epoxy is used upside down. The copper side forms the "ground" and 5 mm wide cut-out pieces of copper clad epoxy are glued to the copper as stand-offs/soldering pads etc. The epoxy side is bolted to a heat sink.