Alpha 87A Amplifier Fault 1  & the ‘downlevel amplifier’ I purchased a used Alpha 87A amplifier from a local ham in April of 2007, and enjoyed using it for a number of months. One evening in October 2007, while trying to work some 160 meter DX, the amplifier faulted on keydown, turning itself off. Upon …

Ameritron AL-1200 to GS35B Conversion The Ameritron AL-1200 Amplifier is in current production. In its factory configuration it uses a single 3CX1200A7 (triode)  tube, grounded grid configuration. Some of the nice features of this amplifier include; Peter Dahl transformer Pi-L output circuit Full 160m-10m coverage Large chassis with accessible components Some of the ‘Russian tubes’ …

The BTI LK-2000 was originally a 3-1000z based amplifier.  It’s nearly as old as I am. The LK-2000 has some pros and cons: Pro – beefy PI-L output circuit robust Peter Dahl Transformer (capable of over 4500v in this configuration) Reasonable layout, lots of room for modifications Con – 220v input, only 3 wire cord …