I'm having the worst time ever with a two stage cascode bjt amp. See attached circuit image. In the circuit photo the "In R: 168ohm" is the amps input resistance according to LtSpice. I usually have luck with LtSpice. The circuit shows real measured resistor values. I built a LtSpice version that included the inductance of real wires, which isn't much inductance because I made everything as tight as possible. I don't have any SMDs. So all of the Rs are 1/4 watts. The desired frequency was 49MHz, but it had no gain there. The gain according to LTspice is over 4000 at 49MHz, but at only 41MHz the real circuit was about 5 lol. Vc was designed at 13.2V. If I dropped the voltage on the real circuit to around 12.8 volts the gain went up a bit, but it starts to oscillate. I'm confused why this circuit is so horrible. I thought cascode amps were supposed to be extremely stable. WikiPedia speaks highly of it, says it even eliminates the miller effect. Prior to this circuit I tried numerous others such as the common emitter. They oscillated, and when I went back into LtSpice and added real inductance from the connections, sure enough, LtSpice showed the high gain amps were extremely prone to oscillations, but LtSpice shows this cascode amp circuit is rock solid. I threw everything I knew at the circuit, realistic supply, excessive wire connection inductance. Nothing. It wouldn't oscillate. Please, any suggestions?? I'd like a gain of at least 1000 somewhere in the 40 to 50 MHz region. The BFG591 transistors I'm using are 7GHz. I live in the U.S., but ordered these from China because they were so cheap. Is it possible they're not the real deals? A single stage common emitter amp circuit using a BFG591 had a gain of about 70 at 49MHz, which was spot on according to LtSpice. The measured gain on all 4 of the BJTs on a multimeter was 128. Perhaps my problem is in making the circuit to small, perhaps too capacitance between parts? The last idea I have is to replace one of the resistors in the second stage with a pot, which would allow me to adjust the voltage supply for max gain on the first stage amp, and then adjust the pot for max gain on the 2nd stage amp. Thanks for any help!