I just finished building a few LZ1AQ loop amplifiers that are for sale. I redesigned the Bias Tee boards, which now have a 200mA Polyfuse on the board. The reason that I made the change is I have had a few that bought the amplifiers and blew the 470uH choke because of either having a short in their coax, or got the polarity wrong.
If anyone is interested please contact me off list at everettsharp@aol.com for info and prices. I also have boards for Lankford Phaser and Mark Connell's (WA1ION) Phaser which was the bases for the Quantum Phaser.
Everett N4CY